PowerShell Suspicious Discovery Related Windows API Functions

This rule detects the use of discovery-related Windows API Functions in Powershell Scripts. Attackers can use these functions to perform various situational awareness related activities, like enumerating users, shares, sessions, domain trusts, groups, etc.,

Rule type: query

Rule indices:

winlogbeat-*
logs-windows.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://github.com/BC-SECURITY/Empire/blob/9259e5106986847d2bb770c4289c0c0f1adf2344/data/module_source/situational_awareness/network/powerview.ps1#L21413

Tags:

Elastic
Host
Windows
Threat Detection
Discovery

Version: 1

Added (Elastic Stack release): 7.16.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

edit

Legitimate Powershell Scripts that make use of these Functions

Rule query

edit

event.code:"4104" and powershell.file.script_block_text : (
NetShareEnum or NetWkstaUserEnum or NetSessionEnum or
NetLocalGroupEnum or NetLocalGroupGetMembers or DsGetSiteName
or DsEnumerateDomainTrusts or WTSEnumerateSessionsEx or
WTSQuerySessionInformation or LsaGetLogonSessionData or
QueryServiceObjectSecurity )

Threat mapping

edit

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Discovery
- ID: TA0007
- Reference URL: https://attack.mitre.org/tactics/TA0007/
Technique:
- Name: Network Share Discovery
- ID: T1135
- Reference URL: https://attack.mitre.org/techniques/T1135/
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/

« PowerShell MiniDump Script PowerShell Suspicious Script with Audio Capture Capabilities »