Lace Tempest PowerShell Evidence Eraser

 1title: Lace Tempest PowerShell Evidence Eraser
 2id: b377ddab-502d-4519-9e8c-5590033d2d70
 3status: experimental
 4description: |
 5        Detects a PowerShell script used by Lace Tempest APT to erase evidence from victim servers by exploiting CVE-2023-47246 as reported by SysAid Team
 6references:
 7    - https://www.sysaid.com/blog/service-desk/on-premise-software-security-vulnerability-notification
 8author: Nasreddine Bencherchali (Nextron Systems)
 9date: 2023/11/09
10tags:
11    - attack.execution
12    - attack.t1059.001
13    - detection.emerging_threats
14logsource:
15    product: windows
16    category: ps_script
17    definition: 'Requirements: Script Block Logging must be enabled'
18detection:
19    selection:
20        ScriptBlockText|contains|all:
21            - 'cleanLL'
22            - 'usersfiles.war'
23            - 'Remove-Item -Path "$tomcat_dir'
24            - 'SysAidServer'
25            - 'sleep '
26            - 'while(1)'
27    condition: selection
28falsepositives:
29    - Unlikely
30level: high