Detection rules › Sigma
Lace Tempest PowerShell Evidence Eraser
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
Known false positives
- Unlikely
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| PowerShell | Event ID 4104: Creating Scriptblock text (MessageNumber of MessageTotal). |
Rule body
title: Lace Tempest PowerShell Evidence Eraser
id: b377ddab-502d-4519-9e8c-5590033d2d70
status: test
description: |
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
references:
- https://www.sysaid.com/blog/service-desk/on-premise-software-security-vulnerability-notification
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-11-09
tags:
- attack.execution
- attack.t1059.001
- detection.emerging-threats
logsource:
product: windows
category: ps_script
definition: 'Requirements: Script Block Logging must be enabled'
detection:
selection:
ScriptBlockText|contains|all:
- 'cleanLL'
- 'usersfiles.war'
- 'Remove-Item -Path "$tomcat_dir'
- 'SysAidServer'
- 'sleep '
- 'while(1)'
condition: selection
falsepositives:
- Unlikely
level: high
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
ScriptBlockText|contains|all:
- 'cleanLL'
- 'usersfiles.war'
- 'Remove-Item -Path "$tomcat_dir'
- 'SysAidServer'
- 'sleep '
- 'while(1)'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
ScriptBlockText | match |
| field:"ScriptBlockText" kind:match |