REvil Kaseya Incident Malware Patterns

calendar Jun 20, 2023 · attack.execution attack.t1059 attack.g0115 detection.emerging_threats  ·
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Detects process command line patterns and locations used by REvil group in Kaseya incident (can also match on other malware)

Sigma rule (View on GitHub)

 1title: REvil Kaseya Incident Malware Patterns
 2id: 5de632bc-7fbd-4c8a-944a-fce55c59eae5
 3status: test
 4description: Detects process command line patterns and locations used by REvil group in Kaseya incident (can also match on other malware)
 5references:
 6    - https://community.sophos.com/b/security-blog/posts/active-ransomware-attack-on-kaseya-customers
 7    - https://www.joesandbox.com/analysis/443736/0/html
 8    - https://doublepulsar.com/kaseya-supply-chain-attack-delivers-mass-ransomware-event-to-us-companies-76e4ec6ec64b
 9    - https://therecord.media/revil-ransomware-executes-supply-chain-attack-via-malicious-kaseya-update/
10    - https://blog.truesec.com/2021/07/04/kaseya-supply-chain-attack-targeting-msps-to-deliver-revil-ransomware/
11author: Florian Roth (Nextron Systems)
12date: 2021/07/03
13modified: 2022/05/20
14tags:
15    - attack.execution
16    - attack.t1059
17    - attack.g0115
18    - detection.emerging_threats
19logsource:
20    category: process_creation
21    product: windows
22detection:
23    selection1:
24        CommandLine|contains:
25            - 'C:\Windows\cert.exe'
26            - 'del /q /f c:\kworking\agent.crt'
27            - 'Kaseya VSA Agent Hot-fix'
28            - '\AppData\Local\Temp\MsMpEng.exe'
29            - 'rmdir /s /q %SystemDrive%\inetpub\logs'
30            - 'del /s /q /f %SystemDrive%\\*.log'
31            - 'c:\kworking1\agent.exe'
32            - 'c:\kworking1\agent.crt'
33    selection2:
34        Image:
35            - 'C:\Windows\MsMpEng.exe'
36            - 'C:\Windows\cert.exe'
37            - 'C:\kworking\agent.exe'
38            - 'C:\kworking1\agent.exe'
39    selection3:
40        CommandLine|contains|all:
41            - 'del /s /q /f'
42            - 'WebPages\Errors\webErrorLog.txt'
43    condition: 1 of selection*
44falsepositives:
45    - Unknown
46level: critical

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