MERCURY APT Activity

 1title: MERCURY APT Activity
 2id: a62298a3-1fe0-422f-9a68-ffbcbc5a123d
 3status: test
 4description: Detects suspicious command line patterns seen being used by MERCURY APT
 5references:
 6    - https://www.microsoft.com/security/blog/2022/08/25/mercury-leveraging-log4j-2-vulnerabilities-in-unpatched-systems-to-target-israeli-organizations/
 7author: Florian Roth (Nextron Systems)
 8date: 2022-08-26
 9modified: 2023-03-10
10tags:
11    - attack.execution
12    - attack.t1059.001
13    - attack.g0069
14    - detection.emerging-threats
15logsource:
16    category: process_creation
17    product: windows
18detection:
19    selection:
20        CommandLine|contains|all:
21            - '-exec bypass -w 1 -enc'
22            - 'UwB0AGEAcgB0AC0ASgBvAGIAIAAtAFMAYwByAGkAcAB0AEIAbABvAGMAawAgAHsAKABzAGEAcABzACAAKAAiAHAA'  # Start-Job -ScriptBlock
23    condition: selection
24falsepositives:
25    - Unknown
26level: high