Custom File Open Handler Executes PowerShell

 1title: Custom File Open Handler Executes PowerShell
 2id: 7530b96f-ad8e-431d-a04d-ac85cc461fdc
 3status: experimental
 4description: Detects the abuse of custom file open handler, executing powershell
 5references:
 6    - https://news.sophos.com/en-us/2022/02/01/solarmarker-campaign-used-novel-registry-changes-to-establish-persistence/?cmp=30728
 7author: CD_R0M_
 8date: 2022/06/11
 9modified: 2023/08/17
10tags:
11    - attack.defense_evasion
12    - attack.t1202
13logsource:
14    category: registry_set
15    product: windows
16detection:
17    selection:
18        TargetObject|contains: 'shell\open\command\'
19        Details|contains|all:
20            - 'powershell'
21            - '-command'
22    condition: selection
23falsepositives:
24    - Unknown
25level: high

References

• SolarMarker campaign used novel registry changes to establish persistence

  

  Inserting custom file handling rules for a randomly-created file extension and a .LNK in Windows’ startup folder, malware installer created a stealthy persistence mechanism for backdoor.

  
  Read More

Related rules

• WSL Child Process Anomaly
• LOLBIN Execution Of The FTP.EXE Binary
• Arbitrary Command Execution Using WSL
• Potential Arbitrary DLL Load Using Winword
• Suspicious Splwow64 Without Params