Detection rules › Sigma
Lace Tempest PowerShell Launcher
Detects a PowerShell script used by Lace Tempest APT to launch their malware loader by exploiting CVE-2023-47246 as reported by SysAid Team
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1059.001 Command and Scripting Interpreter: PowerShell |
Event coverage
| Provider | Event | Title |
|---|---|---|
| PowerShell | Event ID 4104 | Creating Scriptblock text (MessageNumber of MessageTotal). |
Rule body yaml
title: Lace Tempest PowerShell Launcher
id: 37dc5463-f7e3-4f61-ad76-ba59cd02a651
status: test
description: |
Detects a PowerShell script used by Lace Tempest APT to launch their malware loader 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:
- '\SysAidServer\tomcat\webapps'
- 'Starting user.exe'
- '\usersfiles\user.exe'
- 'Remove-Item -Force "$wapps'
- '(Sophos).'
condition: selection
falsepositives:
- Unlikely
level: high
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
ScriptBlockText|contains|all:
- '\SysAidServer\tomcat\webapps'
- 'Starting user.exe'
- '\usersfiles\user.exe'
- 'Remove-Item -Force "$wapps'
- '(Sophos).'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
ScriptBlockText | match |
|