Advisory: Sophos Endpoint "Your connection isn't private" after reboot. Policy settings can be returned to normal. See: KB-000045954 for the latest updates.

Approved

EDR Query - Kaseya ransomware IOC's

SophosLabs has published the IOC for Kaseya ransomware. Below is the query that fetches the IOC published on GitHub and check for matching Indicators present in the endpoint.

/* EDR Query to check for matching REvil-Kaseya-IOC's */

--VARIABLE    $$StartTime$$   DATE
--VARIABLE    $$EndTime$$     DATE

WITH IOC_LIST (IOC_Type, Indicator, note) AS (
 WITH IOC_FILE(Line, str) AS (
  SELECT 'ip,127.0.0.1,TEST DATA', (SELECT result from curl where url = 'https://raw.githubusercontent.com/sophoslabs/IoCs/master/Ransomware-REvil-Kaseya.csv') ||char(10)
  UNION ALL
  SELECT substr(str, 0, instr(str, char(10) )), substr(str, instr(str, char(10) )+1) FROM IOC_FILE WHERE str!=''
 )
SELECT
    replace(Line, ltrim(Line, replace(Line, ',', '')), '') 'Indicator Type',
    replace(replace(substr(Line, instr(Line, ',')+1), ltrim(substr(Line, instr(Line, ',')+1), replace(substr(Line, instr(Line, ',')+1), ',', '')), ''),'*','%')  Indicator,
    replace(Line, rtrim(Line, replace(Line, ',', '')), '') 'Note'
FROM 
    IOC_FILE 
WHERE 
    Line != '' AND Line != 'Indicator type,Data,Note' AND Line NOT LIKE 'Description%' AND Line NOT LIKE '%TEST DATA%' AND Line NOT LIKE '%indicator_type%'
)


SELECT DISTINCT
    CAST( datetime(spa.time,'unixepoch') AS TEXT) DATE_TIME,
    'MATCH FOUND' Detection,
    ioc.IOC_Type,
    ioc.Indicator,
    ioc.note,
    spa.subject,
    spa.SophosPID,
    CAST ( (select replace(spa.pathname, rtrim(spa.pathname, replace(spa.pathname, "\", '')), '')) AS TEXT) process_name,
    spa.action,
    spa.object,
    spa.url AS 'url/hash/pathname'
FROM 
    IOC_LIST ioc
JOIN 
    sophos_process_activity spa ON spa.object LIKE ioc.Indicator AND spa.time BETWEEN $$StartTime$$ AND $$EndTime$$
WHERE 
    ioc.IOC_Type = 'domain' AND spa.subject IN ('Dns','Http','Url','Network')

UNION ALL

SELECT DISTINCT
    CAST( datetime(spj.time,'unixepoch') AS TEXT) DATE_TIME,
    'MATCH FOUND' Detection,
    ioc.IOC_Type,
    ioc.Indicator,
    ioc.note,
    'sophos_process_journal',
    spj.SophosPID,
    CAST ( (select replace(spj.pathname, rtrim(spj.pathname, replace(spj.pathname, "\", '')), '')) AS TEXT) process_name,
    spj.eventtype,
    'process execution',
    spj.sha256
FROM 
    IOC_LIST ioc
 JOIN 
    sophos_process_journal spj ON spj.sha256 LIKE ioc.Indicator AND spj.time BETWEEN $$StartTime$$ AND $$EndTime$$
WHERE 
    ioc.IOC_Type = 'sha256'

UNION ALL

SELECT DISTINCT
    CAST( datetime(spa.time,'unixepoch') AS TEXT) DATE_TIME,
    'MATCH FOUND' Detection,
    ioc.IOC_Type,
    ioc.Indicator,
    ioc.note,
    spa.subject,
    spa.SophosPID,
    CAST ( (select replace(spa.pathname, rtrim(spa.pathname, replace(spa.pathname, "\", '')), '')) AS TEXT) process_name,
    spa.action,
    spa.object,
    spa.pathname
FROM 
    IOC_LIST ioc
 JOIN 
    sophos_process_activity spa ON LOWER(spa.pathname) LIKE LOWER(ioc.Indicator) OR LOWER(spa.object) LIKE LOWER(ioc.Indicator) AND spa.time BETWEEN $$StartTime$$ AND $$EndTime$$
WHERE 
    IOC_Type = 'file_path_name' AND spa.subject IN ('FileBinaryChanges','FileBinaryReads','FileDataChanges','FileDataReads','FileOtherChanges','FileOtherReads','Image','Process')

UNION ALL

SELECT DISTINCT
    CAST( datetime(file.btime,'unixepoch') AS TEXT) DATE_TIME,
    'MATCH FOUND' Detection,
    ioc.IOC_Type,
    ioc.Indicator,
    ioc.note,
    'File_system',
    '' ,
    file.filename,
    'on disk',
    file.path,
    ''
FROM 
    IOC_LIST ioc
 LEFT JOIN 
    file ON LOWER(ioc.IOC_Type) IN('file_path_name') AND file.path LIKE ioc.indicator
WHERE 
    DATE_TIME <> ''

Sophos has published an article to know more about this attack,

https://news.sophos.com/en-us/2021/07/04/independence-day-revil-uses-supply-chain-exploit-to-attack-hundreds-of-businesses/

You can find the IOC published by SophosLabs here

https://raw.githubusercontent.com/sophoslabs/IoCs/master/Ransomware-REvil-Kaseya.csv