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atomic-threat-coverage/Atomic_Threat_Coverage/Detection_Rules/win_susp_rundll32_activity.md
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Title Suspicious Rundll32 Activity
Description Detects suspicious process related to rundll32 based on arguments
ATT&CK Tactic
ATT&CK Technique
Data Needed
Trigger
Severity Level medium
False Positives
  • False positives depend on scripts and administrative tools used in the monitored environment
Development Status experimental
References
Author juju4

Detection Rules

Sigma rule

title: Suspicious Rundll32 Activity
id: e593cf51-88db-4ee1-b920-37e89012a3c9
description: Detects suspicious process related to rundll32 based on arguments
status: experimental
references:
    - http://www.hexacorn.com/blog/2017/05/01/running-programs-via-proxy-jumping-on-a-edr-bypass-trampoline/
    - https://twitter.com/Hexacorn/status/885258886428725250
    - https://gist.github.com/ryhanson/227229866af52e2d963cf941af135a52
tags:
    - attack.defense_evasion
    - attack.execution  # an old one 
    - attack.t1218.011
    - attack.t1085      # an old one 
author: juju4
date: 2019/01/16
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine:
            - '*\rundll32.exe* url.dll,*OpenURL *'
            - '*\rundll32.exe* url.dll,*OpenURLA *'
            - '*\rundll32.exe* url.dll,*FileProtocolHandler *'
            - '*\rundll32.exe* zipfldr.dll,*RouteTheCall *'
            - '*\rundll32.exe* Shell32.dll,*Control_RunDLL *'
            - '*\rundll32.exe javascript:*'
            - '* url.dll,*OpenURL *'
            - '* url.dll,*OpenURLA *'
            - '* url.dll,*FileProtocolHandler *'
            - '* zipfldr.dll,*RouteTheCall *'
            - '* Shell32.dll,*Control_RunDLL *'
            - '* javascript:*'
            - '*.RegisterXLL*'
    condition: selection
falsepositives:
    - False positives depend on scripts and administrative tools used in the monitored environment
level: medium

powershell

Get-WinEvent | where {($_.message -match "CommandLine.*.*\\\\rundll32.exe.* url.dll,.*OpenURL .*" -or $_.message -match "CommandLine.*.*\\\\rundll32.exe.* url.dll,.*OpenURLA .*" -or $_.message -match "CommandLine.*.*\\\\rundll32.exe.* url.dll,.*FileProtocolHandler .*" -or $_.message -match "CommandLine.*.*\\\\rundll32.exe.* zipfldr.dll,.*RouteTheCall .*" -or $_.message -match "CommandLine.*.*\\\\rundll32.exe.* Shell32.dll,.*Control_RunDLL .*" -or $_.message -match "CommandLine.*.*\\\\rundll32.exe javascript:.*" -or $_.message -match "CommandLine.*.* url.dll,.*OpenURL .*" -or $_.message -match "CommandLine.*.* url.dll,.*OpenURLA .*" -or $_.message -match "CommandLine.*.* url.dll,.*FileProtocolHandler .*" -or $_.message -match "CommandLine.*.* zipfldr.dll,.*RouteTheCall .*" -or $_.message -match "CommandLine.*.* Shell32.dll,.*Control_RunDLL .*" -or $_.message -match "CommandLine.*.* javascript:.*" -or $_.message -match "CommandLine.*.*.RegisterXLL.*") } | select TimeCreated,Id,RecordId,ProcessId,MachineName,Message

es-qs

winlog.event_data.CommandLine.keyword:(*\\\\rundll32.exe*\\ url.dll,*OpenURL\\ * OR *\\\\rundll32.exe*\\ url.dll,*OpenURLA\\ * OR *\\\\rundll32.exe*\\ url.dll,*FileProtocolHandler\\ * OR *\\\\rundll32.exe*\\ zipfldr.dll,*RouteTheCall\\ * OR *\\\\rundll32.exe*\\ Shell32.dll,*Control_RunDLL\\ * OR *\\\\rundll32.exe\\ javascript\\:* OR *\\ url.dll,*OpenURL\\ * OR *\\ url.dll,*OpenURLA\\ * OR *\\ url.dll,*FileProtocolHandler\\ * OR *\\ zipfldr.dll,*RouteTheCall\\ * OR *\\ Shell32.dll,*Control_RunDLL\\ * OR *\\ javascript\\:* OR *.RegisterXLL*)

xpack-watcher

curl -s -XPUT -H \'Content-Type: application/json\' --data-binary @- localhost:9200/_watcher/watch/e593cf51-88db-4ee1-b920-37e89012a3c9 <<EOF\n{\n  "metadata": {\n    "title": "Suspicious Rundll32 Activity",\n    "description": "Detects suspicious process related to rundll32 based on arguments",\n    "tags": [\n      "attack.defense_evasion",\n      "attack.execution",\n      "attack.t1218.011",\n      "attack.t1085"\n    ],\n    "query": "winlog.event_data.CommandLine.keyword:(*\\\\\\\\rundll32.exe*\\\\ url.dll,*OpenURL\\\\ * OR *\\\\\\\\rundll32.exe*\\\\ url.dll,*OpenURLA\\\\ * OR *\\\\\\\\rundll32.exe*\\\\ url.dll,*FileProtocolHandler\\\\ * OR *\\\\\\\\rundll32.exe*\\\\ zipfldr.dll,*RouteTheCall\\\\ * OR *\\\\\\\\rundll32.exe*\\\\ Shell32.dll,*Control_RunDLL\\\\ * OR *\\\\\\\\rundll32.exe\\\\ javascript\\\\:* OR *\\\\ url.dll,*OpenURL\\\\ * OR *\\\\ url.dll,*OpenURLA\\\\ * OR *\\\\ url.dll,*FileProtocolHandler\\\\ * OR *\\\\ zipfldr.dll,*RouteTheCall\\\\ * OR *\\\\ Shell32.dll,*Control_RunDLL\\\\ * OR *\\\\ javascript\\\\:* OR *.RegisterXLL*)"\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.event_data.CommandLine.keyword:(*\\\\\\\\rundll32.exe*\\\\ url.dll,*OpenURL\\\\ * OR *\\\\\\\\rundll32.exe*\\\\ url.dll,*OpenURLA\\\\ * OR *\\\\\\\\rundll32.exe*\\\\ url.dll,*FileProtocolHandler\\\\ * OR *\\\\\\\\rundll32.exe*\\\\ zipfldr.dll,*RouteTheCall\\\\ * OR *\\\\\\\\rundll32.exe*\\\\ Shell32.dll,*Control_RunDLL\\\\ * OR *\\\\\\\\rundll32.exe\\\\ javascript\\\\:* OR *\\\\ url.dll,*OpenURL\\\\ * OR *\\\\ url.dll,*OpenURLA\\\\ * OR *\\\\ url.dll,*FileProtocolHandler\\\\ * OR *\\\\ zipfldr.dll,*RouteTheCall\\\\ * OR *\\\\ Shell32.dll,*Control_RunDLL\\\\ * OR *\\\\ javascript\\\\:* OR *.RegisterXLL*)",\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 \'Suspicious Rundll32 Activity\'",\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

CommandLine.keyword:(*\\\\rundll32.exe* url.dll,*OpenURL * *\\\\rundll32.exe* url.dll,*OpenURLA * *\\\\rundll32.exe* url.dll,*FileProtocolHandler * *\\\\rundll32.exe* zipfldr.dll,*RouteTheCall * *\\\\rundll32.exe* Shell32.dll,*Control_RunDLL * *\\\\rundll32.exe javascript\\:* * url.dll,*OpenURL * * url.dll,*OpenURLA * * url.dll,*FileProtocolHandler * * zipfldr.dll,*RouteTheCall * * Shell32.dll,*Control_RunDLL * * javascript\\:* *.RegisterXLL*)

splunk

(CommandLine="*\\\\rundll32.exe* url.dll,*OpenURL *" OR CommandLine="*\\\\rundll32.exe* url.dll,*OpenURLA *" OR CommandLine="*\\\\rundll32.exe* url.dll,*FileProtocolHandler *" OR CommandLine="*\\\\rundll32.exe* zipfldr.dll,*RouteTheCall *" OR CommandLine="*\\\\rundll32.exe* Shell32.dll,*Control_RunDLL *" OR CommandLine="*\\\\rundll32.exe javascript:*" OR CommandLine="* url.dll,*OpenURL *" OR CommandLine="* url.dll,*OpenURLA *" OR CommandLine="* url.dll,*FileProtocolHandler *" OR CommandLine="* zipfldr.dll,*RouteTheCall *" OR CommandLine="* Shell32.dll,*Control_RunDLL *" OR CommandLine="* javascript:*" OR CommandLine="*.RegisterXLL*")

logpoint

CommandLine IN ["*\\\\rundll32.exe* url.dll,*OpenURL *", "*\\\\rundll32.exe* url.dll,*OpenURLA *", "*\\\\rundll32.exe* url.dll,*FileProtocolHandler *", "*\\\\rundll32.exe* zipfldr.dll,*RouteTheCall *", "*\\\\rundll32.exe* Shell32.dll,*Control_RunDLL *", "*\\\\rundll32.exe javascript:*", "* url.dll,*OpenURL *", "* url.dll,*OpenURLA *", "* url.dll,*FileProtocolHandler *", "* zipfldr.dll,*RouteTheCall *", "* Shell32.dll,*Control_RunDLL *", "* javascript:*", "*.RegisterXLL*"]

grep

grep -P '^(?:.*.*\\rundll32\\.exe.* url\\.dll,.*OpenURL .*|.*.*\\rundll32\\.exe.* url\\.dll,.*OpenURLA .*|.*.*\\rundll32\\.exe.* url\\.dll,.*FileProtocolHandler .*|.*.*\\rundll32\\.exe.* zipfldr\\.dll,.*RouteTheCall .*|.*.*\\rundll32\\.exe.* Shell32\\.dll,.*Control_RunDLL .*|.*.*\\rundll32\\.exe javascript:.*|.*.* url\\.dll,.*OpenURL .*|.*.* url\\.dll,.*OpenURLA .*|.*.* url\\.dll,.*FileProtocolHandler .*|.*.* zipfldr\\.dll,.*RouteTheCall .*|.*.* Shell32\\.dll,.*Control_RunDLL .*|.*.* javascript:.*|.*.*\\.RegisterXLL.*)'