Mal/Polazert-A Removal?

It looks like an encrypted command is being passed to powershell upon startup. I'd recommend using Microsoft Autoruns to see if you can find anything that looks out of the ordinary on the device in question. 

The following video from our TechVids team provides some guidance on what to look out for. 
- Active Malware Remediation

Sophos is stopping the execution of this command whenever it tries to run, though I do recommend trying to take a closer look into this as soon as possible. If no files are being found even when a full system scan is being run, this may indicate that the malware is hiding within the Windows WMI databank. 

What may also provide additional information is gathering a boot Process monitor log. IGuidance on how to do so can be found in the following article.
- Gather system events using Process Monitor

If you're looking for assistance with an RCA, or if you would like hands-on assistance with remediation, the Sophos MTR team would be the best team to assist you.

I took a look at Autorun and Process Explorer. Nothing looked out of the ordinary in Autoruns.

I'm mostly curious why Sophos EP isn't removing the malware and instead only telling me about it. The other product we use for threat detection didn't even see it, but now here we have Sophos showing it to me and not cleaning it up. That's just as frustrating. 

-Mike

Well that's appears to be related to the file lnk file referenced, you showed in Autoruns:

ab3a7c450f6438b0df5a3a34d38c0.LNk

In the VT analysis, on the relations page we see the same file:

VirusTotal - File - 1ed9469724b3ba2891dc0efee29b1de93054601cb44aaf433c2b5860884dfa71

So that matches up.

I think it would be worth sending in the same file to SophosLabs and see what they say.

FileSubmission (sophos.com)

Sophos User930 I still haven't run that PowerShell command. I am finding that task a little challenging, but I will keep trying.

I submitted the file to Sophos, who provided the following analysis:

As per the SophosLabs team, both zips contain the same sample.

_p5_1 => identity associated (New detection:  Troj/PS-JV)

Decoded.bin => detected as  Mal/Polazert-A 

The endpoints for this client have not detected any further malicious activity, but the ATP log on the firewall continues to receive these alerts which generate emails that I investigate:

We have DNS on the firewall set to Google, which is why we see 8.8.8.8 and 8.8.4.4. Although I am unclear why we aren't seeing that come from the actual attacker.

The 192.168.25.6 address is the domain controller for our client .I have scanned this server multiple times with Sophos, Kaspersky, and SentinelOne. No malware found. Nothing suspicious in Autorun either.

Am I right to assume this is a malicious website trying to contact an endpoint inside the client network and ATP is doing its job by blocking and dropping the traffic as I instructed it to? If so, I suppose there is nothing else I can do at this point besides wait and hope they stop trying?

-Mike

Hi Mike, sorry for the delay.

I see that after hitting re-analyze for that hash: 1ed9469724b3ba2891dc0efee29b1de93054601cb44aaf433c2b5860884dfa71, on Virus Total - we now have - VirusTotal - Analysing file

Sophos - Troj/Deimos-R

There are still quite a few other vendors that don't detect it, e.g. BitDefender, F-Secure, McAfee, to name a few.

I'm not sure about the DNS request/response seemingly ending up in a C2 detection.

I can understand a malicious process on a client, making a request to fdfdfdf.info for example, this would likely result in a DNS query to the local DNS server, in this case the 192.168.25.6.  This isn't going to be authoritative so will forward on the query to a specified forwarder, which I could image could be Google's DNS.  This results would come back into the local DNS server from Google and trigger the incoming alert on the XG.

So it does seem to suggest there is a host on the inside at least going through the resolution steps prior to making the connection of that .info domain.

I think I would start by trying to understand the client or clients looking up that domain and ideally get back to a process, can you do that from the XG logs I suspect so but I don't know the XG that well.  Maybe it would be worth posting in the XG forum.

I am aware of ways at the endpoint, such as those described here in order to log processes making the connection:

Steps to enable DNS Query Logging on Windows systems (windowsreport.com)

You can enable Sysmon on the endpoints as mentioned above, you can use Sophos Central to centrally query the event logs of Sysmon. For example for Event ID 1 - Process creation the following LiveQuery would work:

SELECT
--strftime('%Y-%m-%dT%H:%M:%SZ',datetime) AS Datetime,
JSON_EXTRACT(data, '$.EventData.UtcTime') as UtcTime,
JSON_EXTRACT(data, '$.EventData.ProcessId') as ProcessId,
JSON_EXTRACT(data, '$.EventData.CommandLine') as CommandLine,
JSON_EXTRACT(data, '$.EventData.User') as User,
JSON_EXTRACT(data, '$.EventData.ParentProcessId') as ParentProcessId,
JSON_EXTRACT(data, '$.EventData.ParentCommandLine') as ParentCommandLine,
JSON_EXTRACT(data, '$.EventData.Image') as Image,
JSON_EXTRACT(data, '$.EventData.FileVersion') as FileVersion,
JSON_EXTRACT(data, '$.EventData.Description') as Description,
JSON_EXTRACT(data, '$.EventData.Product') as Product,
JSON_EXTRACT(data, '$.EventData.Company') as Company,
JSON_EXTRACT(data, '$.EventData.OriginalFileName') as OriginalFileName,
JSON_EXTRACT(data, '$.EventData.ProcessGuid') as ProcessGuid ,
JSON_EXTRACT(data, '$.EventData.CurrentDirectory') as CurrentDirectory,
JSON_EXTRACT(data, '$.EventData.LogonGuid') as LogonGuid,
JSON_EXTRACT(data, '$.EventData.LogonId') as LogonId,
JSON_EXTRACT(data, '$.EventData.TerminalSessionId') as TerminalSessionId,
JSON_EXTRACT(data, '$.EventData.IntegrityLevel') as IntegrityLevel,
JSON_EXTRACT(data, '$.EventData.Hashes') as Hashes,
JSON_EXTRACT(data, '$.EventData.ParentProcessGuid') as ParentProcessGuid,
JSON_EXTRACT(data, '$.EventData.ParentImage') as ParentImage
FROM
sophos_windows_events where source = 'Microsoft-Windows-Sysmon/Operational'
and eventid = 1

Just tested it by downloading Sysmon from:

Sysmon - Windows Sysinternals | Microsoft Docs

Put sysmon.exe in C:\tools\ and ran from an admin prompt:

sysmon.exe -c .\sysmon-dns.xml

Where sysmon-dns.xml is a file I created based on sysmon-config/sysmonconfig-export.xml at master · SwiftOnSecurity/sysmon-config · GitHub but just targeting the DNS section. So it's down to:

<Sysmon schemaversion="4.50">
	<HashAlgorithms>md5,sha256,IMPHASH</HashAlgorithms>  
         <EventFiltering>
		<DnsQuery onmatch="exclude">
			<!--Network noise-->
			<QueryName condition="end with">.arpa.</QueryName> <!--Design decision to not log reverse DNS lookups. You will need to decide.-->
			<QueryName condition="end with">.arpa</QueryName> <!--Design decision to not log reverse DNS lookups. You will need to decide.-->
			<QueryName condition="end with">.msftncsi.com</QueryName> <!--Microsoft proxy detection | Microsoft default exclusion-->
			<QueryName condition="is">..localmachine</QueryName>
			<QueryName condition="is">localhost</QueryName>
			<!--Microsoft-->
			<QueryName condition="end with">-pushp.svc.ms</QueryName> <!--Microsoft: Doesn't appear to host customer content or subdomains-->
			<QueryName condition="end with">.b-msedge.net</QueryName> <!--Microsoft: Doesn't appear to host customer content or subdomains-->
			<QueryName condition="end with">.bing.com</QueryName> <!-- Microsoft | Microsoft default exclusion -->
			<QueryName condition="end with">.hotmail.com</QueryName> <!--Microsoft | Microsoft default exclusion-->
			<QueryName condition="end with">.live.com</QueryName> <!--Microsoft | Microsoft default exclusion-->
			<QueryName condition="end with">.live.net</QueryName> <!--Microsoft | Microsoft default exclusion-->
			<QueryName condition="end with">.s-microsoft.com</QueryName> <!--Microsoft-->
			<QueryName condition="end with">.microsoft.com</QueryName> <!--Microsoft | Microsoft default exclusion-->
			<QueryName condition="end with">.microsoftonline.com</QueryName> <!--Microsoft | Microsoft default exclusion-->
			<QueryName condition="end with">.microsoftstore.com</QueryName> <!--Microsoft | Microsoft default exclusion-->
			<QueryName condition="end with">.ms-acdc.office.com</QueryName> <!--Microsoft: Doesn't appear to host customer content or subdomains-->
			<QueryName condition="end with">.msedge.net</QueryName> <!--Microsoft: Doesn't appear to host customer content or subdomains-->
			<QueryName condition="end with">.msn.com</QueryName> <!--Microsoft | Microsoft default exclusion-->
			<QueryName condition="end with">.msocdn.com</QueryName> <!--Microsoft-->
			<QueryName condition="end with">.skype.com</QueryName> <!--Microsoft | Microsoft default exclusion-->
			<QueryName condition="end with">.skype.net</QueryName> <!--Microsoft | Microsoft default exclusion-->
			<QueryName condition="end with">.windows.com</QueryName> <!--Microsoft-->
			<QueryName condition="end with">.windows.net.nsatc.net</QueryName> <!--Microsoft-->
			<QueryName condition="end with">.windowsupdate.com</QueryName> <!--Microsoft-->
			<QueryName condition="end with">.xboxlive.com</QueryName> <!--Microsoft-->
			<QueryName condition="is">login.windows.net</QueryName> <!--Microsoft-->
			<Image condition="begin with">C:\ProgramData\Microsoft\Windows Defender\Platform\</Image> <!--Microsoft: https://docs.microsoft.com/en-us/windows/security/threat-protection/microsoft-defender-atp/network-protection -->
			<!--Microsoft:Office365/AzureAD-->
			<QueryName condition="end with">.activedirectory.windowsazure.com</QueryName> <!--Microsoft: AzureAD-->
			<QueryName condition="end with">.aria.microsoft.com</QueryName> <!--Microsoft: OneDrive/SharePoint-->
			<QueryName condition="end with">.msauth.net</QueryName>
			<QueryName condition="end with">.msftauth.net</QueryName>
			<QueryName condition="end with">.office.net</QueryName> <!--Microsoft: Office-->
			<QueryName condition="end with">.opinsights.azure.com</QueryName> <!--Microsoft: AzureAD/InTune client event monitoring-->
			<QueryName condition="end with">.res.office365.com</QueryName> <!--Microsoft: Office-->
			<QueryName condition="is">acdc-direct.office.com</QueryName> <!--Microsoft: Office-->
			<QueryName condition="is">atm-fp-direct.office.com</QueryName> <!--Microsoft: Office-->
			<QueryName condition="is">loki.delve.office.com</QueryName> <!--Microsoft: Office-->
			<QueryName condition="is">management.azure.com</QueryName> <!--Microsoft: AzureAD/InTune-->
			<QueryName condition="is">messaging.office.com</QueryName> <!--Microsoft: Office-->
			<QueryName condition="is">outlook.office365.com</QueryName> <!--Microsoft: Protected by HSTS-->
			<QueryName condition="is">portal.azure.com</QueryName> <!--Microsoft: AzureAD/InTune-->
			<QueryName condition="is">protection.outlook.com</QueryName> <!--Microsoft: Office-->
			<QueryName condition="is">substrate.office.com</QueryName> <!--Microsoft: Office-->
			<QueryName condition="end with">.measure.office.com</QueryName> <!--Microsoft: Office-->
			<!--3rd-party applications-->
			<QueryName condition="end with">.adobe.com</QueryName> <!--Adobe-->
			<QueryName condition="end with">.adobe.io</QueryName> <!--Adobe-->
			<QueryName condition="end with">.mozaws.net</QueryName> <!--Mozilla-->
			<QueryName condition="end with">.mozilla.com</QueryName> <!--Mozilla-->
			<QueryName condition="end with">.mozilla.net</QueryName> <!--Mozilla-->
			<QueryName condition="end with">.mozilla.org</QueryName> <!--Mozilla-->
			<QueryName condition="end with">.spotify.com</QueryName> <!--Spotify-->
			<QueryName condition="end with">.spotify.map.fastly.net</QueryName> <!--Spotify-->
			<QueryName condition="end with">.wbx2.com</QueryName> <!--Webex-->
			<QueryName condition="end with">.webex.com</QueryName> <!--Webex-->
			<QueryName condition="is">clients1.google.com</QueryName> <!--Google-->
			<QueryName condition="is">clients2.google.com</QueryName> <!--Google-->
			<QueryName condition="is">clients3.google.com</QueryName> <!--Google-->
			<QueryName condition="is">clients4.google.com</QueryName> <!--Google-->
			<QueryName condition="is">clients5.google.com</QueryName> <!--Google-->
			<QueryName condition="is">clients6.google.com</QueryName> <!--Google-->
			<QueryName condition="is">safebrowsing.googleapis.com</QueryName> <!--Google-->
			<!--Goodlist CDN-->
			<QueryName condition="end with">.akadns.net</QueryName> <!--AkamaiCDN, extensively used by Microsoft | Microsoft default exclusion-->
			<QueryName condition="end with">.netflix.com</QueryName>
			<QueryName condition="end with">aspnetcdn.com</QueryName> <!--Microsoft [ https://docs.microsoft.com/en-us/aspnet/ajax/cdn/overview ]-->
			<QueryName condition="is">ajax.googleapis.com</QueryName>
			<QueryName condition="is">cdnjs.cloudflare.com</QueryName> <!--Cloudflare: Hosts popular javascript libraries-->
			<QueryName condition="is">fonts.googleapis.com</QueryName> <!--Google fonts-->
			<QueryName condition="end with">.typekit.net</QueryName> <!--Adobe fonts-->
			<QueryName condition="is">cdnjs.cloudflare.com</QueryName>
			<QueryName condition="end with">.stackassets.com</QueryName> <!--Stack Overflow-->
			<QueryName condition="end with">.steamcontent.com</QueryName>
			<QueryName condition="is">play.google.com</QueryName>
			<QueryName condition="is">content-autofill.googleapis.com</QueryName>
			<!--Web resources-->
			<QueryName condition="end with">.disqus.com</QueryName> <!--Microsoft default exclusion-->
			<QueryName condition="end with">.fontawesome.com</QueryName>
			<QueryName condition="is">disqus.com</QueryName> <!--Microsoft default exclusion-->
			<!--Ads-->
			<QueryName condition="end with">.1rx.io</QueryName> <!--Ads-->
			<QueryName condition="end with">.2mdn.net</QueryName> <!--Ads: Google | Microsoft default exclusion-->
			<QueryName condition="end with">.3lift.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.adadvisor.net</QueryName> <!--Ads: Neustar [ https://better.fyi/trackers/adadvisor.net/ ] -->
			<QueryName condition="end with">.adap.tv</QueryName> <!--Ads:AOL | Microsoft default exclusion [ https://www.crunchbase.com/organization/adap-tv ] -->
			<QueryName condition="end with">.addthis.com</QueryName> <!--Ads:Oracle | Microsoft default exclusion [ https://en.wikipedia.org/wiki/AddThis ] -->
			<QueryName condition="end with">.adform.net</QueryName> <!--Ads-->
			<QueryName condition="end with">.adnxs.com</QueryName> <!--Ads: AppNexus | Microsoft default exclusion-->
			<QueryName condition="end with">.adroll.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.adrta.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.adsafeprotected.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.adsrvr.org</QueryName> <!--Ads-->
			<QueryName condition="end with">.adsymptotic.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.advertising.com</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.agkn.com</QueryName> <!--Ads | [ https://www.home.neustar/privacy ] -->
			<QueryName condition="end with">.amazon-adsystem.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.amazon-adsystem.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.analytics.yahoo.com</QueryName> <!--Ads:Yahoo-->
			<QueryName condition="end with">.aol.com</QueryName> <!--Ads | Microsoft default exclusion -->
			<QueryName condition="end with">.betrad.com</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.bidswitch.net</QueryName> <!--Ads-->
			<QueryName condition="end with">.casalemedia.com</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.chartbeat.net</QueryName> <!--Ads | Microsoft default exclusion [ https://better.fyi/trackers/chartbeat.com/ ]-->
			<QueryName condition="end with">.cnn.com</QueryName> <!-- Microsoft default exclusion-->
			<QueryName condition="end with">.convertro.com</QueryName> <!--Ads:Verizon-->
			<QueryName condition="end with">.criteo.com</QueryName> <!--Ads [ https://better.fyi/trackers/criteo.com/ ] -->
			<QueryName condition="end with">.criteo.net</QueryName> <!--Ads [ https://better.fyi/trackers/criteo.com/ ] -->
			<QueryName condition="end with">.crwdcntrl.net</QueryName> <!--Ads: Lotame [ https://better.fyi/trackers/crwdcntrl.net/ ] -->
			<QueryName condition="end with">.demdex.net</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.domdex.com</QueryName>
			<QueryName condition="end with">.dotomi.com</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.doubleclick.net</QueryName> <!--Ads:Conversant | Microsoft default exclusion [ https://www.crunchbase.com/organization/dotomi ] -->
			<QueryName condition="end with">.doubleverify.com</QueryName> <!--Ads: Google-->
			<QueryName condition="end with">.emxdgt.com</QueryName> <!--Ads: EMX-->
			<QueryName condition="end with">.everesttech.net</QueryName> <!--Ads | [ https://better.fyi/trackers/everesttech.net/ ] -->
			<QueryName condition="end with">.exelator.com</QueryName> <!--Ads:Nielson Marketing Cloud-->
			<QueryName condition="end with">.google-analytics.com</QueryName> <!--Ads:Google | Microsoft default exclusion-->
			<QueryName condition="end with">.googleadservices.com</QueryName> <!--Google-->
			<QueryName condition="end with">.googlesyndication.com</QueryName> <!--Ads:Google, sometimes called during malicious ads, but not directly responsible | Microsoft default exclusion [ https://www.hackread.com/wp-content/uploads/2018/06/Bitdefender-Whitepaper-Zacinlo.pdf ]-->
			<QueryName condition="end with">.googletagmanager.com</QueryName> <!--Google-->
			<QueryName condition="end with">.googlevideo.com</QueryName> <!--Google | Microsoft default exclusion-->
			<QueryName condition="end with">.gstatic.com</QueryName> <!--Google | Microsoft default exclusion-->
			<QueryName condition="end with">.gvt1.com</QueryName> <!--Google-->
			<QueryName condition="end with">.gvt2.com</QueryName> <!--Google-->
			<QueryName condition="end with">.ib-ibi.com</QueryName> <!--Ads: Offerpath [ https://better.fyi/trackers/ib-ibi.com/ ] -->
			<QueryName condition="end with">.jivox.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.krxd.net</QueryName> <!--Ads-->
			<QueryName condition="end with">.lijit.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.mathtag.com</QueryName> <!--Microsoft default exclusion-->
			<QueryName condition="end with">.moatads.com</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.moatpixel.com</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.mookie1.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.myvisualiq.net</QueryName> <!--Ads-->
			<QueryName condition="end with">.netmng.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.nexac.com</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.openx.net</QueryName> <!--Ads-->
			<QueryName condition="end with">.optimizely.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.outbrain.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.pardot.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.phx.gbl</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.pinterest.com</QueryName> <!--Pinerest-->
			<QueryName condition="end with">.pubmatic.com</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.quantcount.com</QueryName>
			<QueryName condition="end with">.quantserve.com</QueryName>
			<QueryName condition="end with">.revsci.net</QueryName> <!--Ads:Omniture | Microsoft default exclusion-->
			<QueryName condition="end with">.rfihub.net</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.rlcdn.com</QueryName> <!--Ads: Rapleaf [ https://better.fyi/trackers/rlcdn.com/ ] -->
			<QueryName condition="end with">.rubiconproject.com</QueryName> <!--Ads: Rubicon Project | Microsoft default exclusion [ https://better.fyi/trackers/rubiconproject.com/ ] -->
			<QueryName condition="end with">.scdn.co</QueryName> <!--Spotify-->
			<QueryName condition="end with">.scorecardresearch.com</QueryName> <!--Ads: Comscore | Microsoft default exclusion-->
			<QueryName condition="end with">.serving-sys.com</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.sharethrough.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.simpli.fi</QueryName>
			<QueryName condition="end with">.sitescout.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.smartadserver.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.snapads.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.spotxchange.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.taboola.com</QueryName> <!--Ads:Taboola-->
			<QueryName condition="end with">.taboola.map.fastly.net</QueryName> <!--Ads:Taboola-->
			<QueryName condition="end with">.tapad.com</QueryName>
			<QueryName condition="end with">.tidaltv.com</QueryName> <!--Ads: Videology [ https://better.fyi/trackers/tidaltv.com/ ] -->
			<QueryName condition="end with">.trafficmanager.net</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.tremorhub.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.tribalfusion.com</QueryName> <!--Ads: Exponential [ https://better.fyi/trackers/tribalfusion.com/ ] -->
			<QueryName condition="end with">.turn.com</QueryName> <!--Ads | Microsoft default exclusion [ https://better.fyi/trackers/turn.com/ ] -->
			<QueryName condition="end with">.twimg.com</QueryName> <!--Ads | Microsoft default exclusion-->
			<QueryName condition="end with">.tynt.com</QueryName> <!--Ads-->
			<QueryName condition="end with">.w55c.net</QueryName> <!--Ads:dataxu-->
			<QueryName condition="end with">.ytimg.com</QueryName> <!--Google-->
			<QueryName condition="end with">.zorosrv.com</QueryName> <!--Ads:Taboola-->
			<QueryName condition="is">1rx.io</QueryName> <!--Ads-->
			<QueryName condition="is">adservice.google.com</QueryName> <!--Google-->
			<QueryName condition="is">ampcid.google.com</QueryName> <!--Google-->
			<QueryName condition="is">clientservices.googleapis.com</QueryName> <!--Google-->
			<QueryName condition="is">googleadapis.l.google.com</QueryName> <!--Google-->
			<QueryName condition="is">imasdk.googleapis.com</QueryName> <!--Google [ https://developers.google.com/interactive-media-ads/docs/sdks/html5/ ] -->
			<QueryName condition="is">l.google.com</QueryName> <!--Google-->
			<QueryName condition="is">ml314.com</QueryName> <!--Ads-->
			<QueryName condition="is">mtalk.google.com</QueryName> <!--Google-->
			<QueryName condition="is">update.googleapis.com</QueryName> <!--Google-->
			<QueryName condition="is">www.googletagservices.com</QueryName> <!--Google-->
			<!--SocialNet-->
			<QueryName condition="end with">.pscp.tv</QueryName> <!--Twitter:Periscope-->
			<!--OSCP/CRL Common-->
			<QueryName condition="end with">.amazontrust.com</QueryName>
			<QueryName condition="end with">.digicert.com</QueryName>
			<QueryName condition="end with">.globalsign.com</QueryName>
			<QueryName condition="end with">.globalsign.net</QueryName>
			<QueryName condition="end with">.intel.com</QueryName>
			<QueryName condition="end with">.symcb.com</QueryName> <!--Digicert-->
			<QueryName condition="end with">.symcd.com</QueryName> <!--Digicert-->
			<QueryName condition="end with">.thawte.com</QueryName>
			<QueryName condition="end with">.usertrust.com</QueryName>
			<QueryName condition="end with">.verisign.com</QueryName>
			<QueryName condition="end with">ocsp.identrust.com</QueryName>
			<QueryName condition="end with">pki.goog</QueryName>
			<QueryName condition="is">msocsp.com</QueryName> <!--Microsoft:OCSP-->
			<QueryName condition="is">ocsp.comodoca.com</QueryName>
			<QueryName condition="is">ocsp.entrust.net</QueryName>
			<QueryName condition="is">ocsp.godaddy.com</QueryName>
			<QueryName condition="is">ocsp.int-x3.letsencrypt.org</QueryName>
			<QueryName condition="is">ocsp.msocsp.com</QueryName> <!--Microsoft:OCSP-->
			<QueryName condition="end with">pki.goog</QueryName>
			<QueryName condition="is">ocsp.godaddy.com</QueryName>
			<QueryName condition="end with">amazontrust.com</QueryName>
			<QueryName condition="is">ocsp.sectigo.com</QueryName>
			<QueryName condition="is">pki-goog.l.google.com</QueryName>
			<QueryName condition="end with">.usertrust.com</QueryName>
			<QueryName condition="is">ocsp.comodoca.com</QueryName>
			<QueryName condition="is">ocsp.verisign.com</QueryName>
			<QueryName condition="is">ocsp.entrust.net</QueryName>
			<QueryName condition="end with">ocsp.identrust.com</QueryName>
			<QueryName condition="is">status.rapidssl.com</QueryName>
			<QueryName condition="is">status.thawte.com</QueryName>
			<QueryName condition="is">ocsp.int-x3.letsencrypt.org</QueryName>
		</DnsQuery>


	</EventFiltering>
</Sysmon>

Waited for the computer to generate some data for this in the Sysmon Event log, then in Sophos Central, create a new Live Query with the following:

SELECT
--strftime('%Y-%m-%dT%H:%M:%SZ',datetime) AS Datetime,
JSON_EXTRACT(data, '$.EventData.UtcTime') as UtcTime,
JSON_EXTRACT(data, '$.EventData.ProcessId') as ProcessId,
JSON_EXTRACT(data, '$.EventData.QueryName') as QueryName,
JSON_EXTRACT(data, '$.EventData.QueryStatus') as QueryStatus,
JSON_EXTRACT(data, '$.EventData.QueryResults') as QueryResults,
JSON_EXTRACT(data, '$.EventData.Image') as Image,
JSON_EXTRACT(data, '$.EventData.User') as User
FROM
sophos_windows_events where source = 'Microsoft-Windows-Sysmon/Operational'
and eventid = 22

This created a report of the data.

So for a given address, you could either filter for it in the Symon config or filter for it in the LiveQuery query,

E.g. With an added clause in the filter for processes that have made a DNS request for "adservice.google.com" shows MsEdge.exe performed 2 queries for this domain.

Sophos User930

I haven't been able to get Sysmon installed and configured for this office endpoints, but I did notice there is a DNS Client log built into Windows by default now, Microsoft-Windows-DNS-Client/Operational.

I tired enabling that on some PC's and running a variation of the query above, but it always shows me no results. Intercept X and Kaspersky show no infections on any PC in the office.

They have two WiFi SSID's running both from the APX320 and the XG115. Guest is set up as 'Separate Zone' and Private is set up as 'Bridge to AP LAN'. 

DNS on the XG115 is set to Google. Could it be that perhaps someone on the WiFi has an infected device that is creating this traffic? The traffic is still the same as it was in my screenshot a couple weeks ago. It's not everyday, just during the week, during business hours. All office PC's stay on and connected to the internet.

-Mike

The following Live Query query, having enabled the built in operation event log: "Microsoft-Windows-DNS-Client/Operational" works OK.

I have created a string variable called domain, in this example to make editing the domain "external" to the query:

SELECT
datetime, 
JSON_EXTRACT(data, '$.EventData.QueryName') as QueryName,
JSON_EXTRACT(data, '$.EventData.QueryType') as QueryType,
JSON_EXTRACT(data, '$.EventData.DnsServerIpAddress') as DnsServerIpAddress,
JSON_EXTRACT(data, '$.EventData.ClientPID') as ClientPID
FROM
sophos_windows_events where source = 'Microsoft-Windows-DNS-Client/Operational'
and eventid = 3010
and QueryName like '$$domain$$'

This does give a PID but the benefit of Sysmon being it also provides the process. That said, if you're initially just interested in the domain.

I suspect if an application used sockets to construct it's own DNS query rather than using a DNS API then the windows DNS resolver wouldn't see it.

It might be worth you creating a new post in the XG part of the forum. The people there might be better placed to respond on how to approach such alerts.

Thanks.

Hi Sophos User930

I was finally able to visit this again. I can't get Sysmon to work. I ran the query you posted, it worked!

I think the Sysmon tool would be much better. Do you think we could work together to get my Sysmon working please?

-Mike

Hello,

I suppose we can tackle it step by step.

First thing would be to decide how to deploy it, if you're using Live Response as a test I would so as before with autoruns:

1. Type:

Powershell

Enter, to start a PowerShell prompt.

2. Make a temp directory for Sysmon in the root of the C drive, type the following as you're in a PowerShell prompt:

New-Item -Path "c:\" -Name "Sysmon" -ItemType "directory"

3. change to that new directory:

CD \Sysmon

4. Download Sysmon from Sysinternals.com to the same directory, by running:

Invoke-WebRequest live.sysinternals.com/Sysmon.exe -UseBasicParsing -OutFile sysmon.exe

5. Download the config file for logging DNS requests to the directory also. I've copied the above XML into a new Pastebin resource so it's publicly available:

Invoke-WebRequest https://pastebin.com/raw/ve9M84wZ  -OutFile sysmon-config-dns.xml

6. Install Sysmon by running:

&"./sysmon.exe" /accepteula -i

7. Configure it with the config.file downloaded to the same directory:

&"./sysmon.exe" -c .\sysmon-config-dns.xml

8. Optionally, run:
Fltmc.exe 

This will confirm the SymonDrv is running.

At this point you should be able to start running the queries to use the Symon Event log.

Hope it helps.

To make it easier, you could just launch LiveReponse. Run PowerShell.exe to get a PS prompt and then paste:

New-Item -Path "c:\" -Name "Sysmon" -ItemType "directory"
CD \Sysmon
Invoke-WebRequest live.sysinternals.com/Sysmon.exe -UseBasicParsing -OutFile sysmon.exe
Invoke-WebRequest https://pastebin.com/raw/ve9M84wZ  -OutFile sysmon-config-dns.xml
&"./sysmon.exe" /accepteula -i
&"./sysmon.exe" -c .\sysmon-config-dns.xml
Fltmc.exe 

This will carry out all the commands in one go.

That all worked, thank you Sophos User930. I set it up on the DNS server (the 192.168.25.6 address).

I waited for the threat to be detected, and it happened. That is the order, from bottom to top, of the three DNS forwarders in AD DNS.

I ran the query, and nothing looks malicious:

I can't figure out which of that is sending off requests to that malware URL. Does anything look suspicious to you?

-Mike

That all worked, thank you Sophos User930. I set it up on the DNS server (the 192.168.25.6 address).

I waited for the threat to be detected, and it happened. That is the order, from bottom to top, of the three DNS forwarders in AD DNS.

I ran the query, and nothing looks malicious:

I can't figure out which of that is sending off requests to that malware URL. Does anything look suspicious to you?

-Mike

Hi Mike, nothing from that result set looks of concern but then I'm not sure how the times match up.  I don't really use the XG to give you better advice. I would create a new post in the XG section and maybe reference this page.  They must run into this scenario quite a lot.  I'm sure they would know what to recommend.

Thanks.