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 T1218.011: Rundll32 T1086: PowerShell T1059.001: PowerShell
Data Needed	DN_0012_8_windows_sysmon_CreateRemoteThread
Trigger	T1218.011: Rundll32 T1059.001: PowerShell
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
id: 99b97608-3e21-4bfe-8217-2a127c396a0e
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          # an old one
    - attack.t1218.011
    - attack.t1086          # an old one
    - attack.t1059.001
falsepositives:
    - Unkown
level: high

powershell

Get-WinEvent -LogName Microsoft-Windows-Sysmon/Operational | where {($_.ID -eq "8" -and $_.message -match "SourceImage.*.*\\\\powershell.exe" -and $_.message -match "TargetImage.*.*\\\\rundll32.exe") } | select TimeCreated,Id,RecordId,ProcessId,MachineName,Message

es-qs

(winlog.channel:"Microsoft\\-Windows\\-Sysmon\\/Operational" AND winlog.event_id:"8" AND winlog.event_data.SourceImage.keyword:*\\\\powershell.exe AND winlog.event_data.TargetImage.keyword:*\\\\rundll32.exe)

xpack-watcher

curl -s -XPUT -H \'Content-Type: application/json\' --data-binary @- localhost:9200/_watcher/watch/99b97608-3e21-4bfe-8217-2a127c396a0e <<EOF\n{\n  "metadata": {\n    "title": "PowerShell Rundll32 Remote Thread Creation",\n    "description": "Detects PowerShell remote thread creation in Rundll32.exe",\n    "tags": [\n      "attack.defense_evasion",\n      "attack.execution",\n      "attack.t1085",\n      "attack.t1218.011",\n      "attack.t1086",\n      "attack.t1059.001"\n    ],\n    "query": "(winlog.channel:\\"Microsoft\\\\-Windows\\\\-Sysmon\\\\/Operational\\" AND winlog.event_id:\\"8\\" AND winlog.event_data.SourceImage.keyword:*\\\\\\\\powershell.exe AND winlog.event_data.TargetImage.keyword:*\\\\\\\\rundll32.exe)"\n  },\n  "trigger": {\n    "schedule": {\n      "interval": "30m"\n    }\n  },\n  "input": {\n    "search": {\n      "request": {\n        "body": {\n          "size": 0,\n          "query": {\n            "bool": {\n              "must": [\n                {\n                  "query_string": {\n                    "query": "(winlog.channel:\\"Microsoft\\\\-Windows\\\\-Sysmon\\\\/Operational\\" AND winlog.event_id:\\"8\\" AND winlog.event_data.SourceImage.keyword:*\\\\\\\\powershell.exe AND winlog.event_data.TargetImage.keyword:*\\\\\\\\rundll32.exe)",\n                    "analyze_wildcard": true\n                  }\n                }\n              ],\n              "filter": {\n                "range": {\n                  "timestamp": {\n                    "gte": "now-30m/m"\n                  }\n                }\n              }\n            }\n          }\n        },\n        "indices": [\n          "winlogbeat-*"\n        ]\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      "throttle_period": "15m",\n      "email": {\n        "profile": "standard",\n        "from": "root@localhost",\n        "to": "root@localhost",\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.keyword:*\\\\powershell.exe AND TargetImage.keyword:*\\\\rundll32.exe)

splunk

(source="WinEventLog:Microsoft-Windows-Sysmon/Operational" EventCode="8" SourceImage="*\\\\powershell.exe" TargetImage="*\\\\rundll32.exe")

logpoint

(event_id="8" SourceImage="*\\\\powershell.exe" TargetImage="*\\\\rundll32.exe")

grep

grep -P '^(?:.*(?=.*8)(?=.*.*\\powershell\\.exe)(?=.*.*\\rundll32\\.exe))'