atomic-threat-coverage/Atomic_Threat_Coverage/Detection_Rules/sysmon_susp_powershell_rundll32.md

Title	PowerShell Rundll32 Remote Thread Creation
Description	Detects PowerShell remote thread creation in Rundll32.exe
ATT&CK Tactic	TA0005: Defense Evasion TA0002: Execution
ATT&CK Technique	T1085: Rundll32 T1086: PowerShell
Data Needed	DN_0012_8_windows_sysmon_CreateRemoteThread
Trigger	('Rundll32', 'T1085').md) ('PowerShell', 'T1086').md)
Severity Level	high
False Positives	Unkown
Development Status	experimental
References	https://www.fireeye.com/blog/threat-research/2018/06/bring-your-own-land-novel-red-teaming-technique.html
Author	Florian Roth

Detection Rules

Sigma rule

title: PowerShell Rundll32 Remote Thread Creation
status: experimental
description: Detects PowerShell remote thread creation in Rundll32.exe 
author: Florian Roth
references:
    - https://www.fireeye.com/blog/threat-research/2018/06/bring-your-own-land-novel-red-teaming-technique.html
date: 2018/06/25
logsource:
    product: windows
    service: sysmon
detection:
    selection:
        EventID: 8
        SourceImage: '*\powershell.exe'
        TargetImage: '*\rundll32.exe'
    condition: selection
tags:
    - attack.defense_evasion
    - attack.execution
    - attack.t1085
    - attack.t1086
falsepositives:
    - Unkown
level: high

Kibana query

(EventID:"8" AND SourceImage.keyword:*\\\\powershell.exe AND TargetImage.keyword:*\\\\rundll32.exe)

X-Pack Watcher

curl -s -XPUT -H \'Content-Type: application/json\' --data-binary @- localhost:9200/_xpack/watcher/watch/PowerShell-Rundll32-Remote-Thread-Creation <<EOF\n{\n  "trigger": {\n    "schedule": {\n      "interval": "30m"\n    }\n  },\n  "input": {\n    "search": {\n      "request": {\n        "body": {\n          "size": 0,\n          "query": {\n            "query_string": {\n              "query": "(EventID:\\"8\\" AND SourceImage.keyword:*\\\\\\\\powershell.exe AND TargetImage.keyword:*\\\\\\\\rundll32.exe)",\n              "analyze_wildcard": true\n            }\n          }\n        },\n        "indices": []\n      }\n    }\n  },\n  "condition": {\n    "compare": {\n      "ctx.payload.hits.total": {\n        "not_eq": 0\n      }\n    }\n  },\n  "actions": {\n    "send_email": {\n      "email": {\n        "to": null,\n        "subject": "Sigma Rule \'PowerShell Rundll32 Remote Thread Creation\'",\n        "body": "Hits:\\n{{#ctx.payload.hits.hits}}{{_source}}\\n================================================================================\\n{{/ctx.payload.hits.hits}}",\n        "attachments": {\n          "data.json": {\n            "data": {\n              "format": "json"\n            }\n          }\n        }\n      }\n    }\n  }\n}\nEOF\n

Graylog

(EventID:"8" AND SourceImage:"*\\\\powershell.exe" AND TargetImage:"*\\\\rundll32.exe")