SigmaHQ/rules/windows/process_creation/win_susp_rundll32_activity.yml

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, Jonhnathan Ribeiro, oscd.community
date: 2019/01/16
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - CommandLine|contains:
            - 'javascript:'
            - '.RegisterXLL'
        - CommandLine|contains|all:
            - 'url.dll'
            - 'OpenURL'
        - CommandLine|contains|all:
            - 'url.dll'
            - 'OpenURLA'
        - CommandLine|contains|all:
            - 'url.dll'
            - 'FileProtocolHandler'
        - CommandLine|contains|all:
            - 'zipfldr.dll'
            - 'RouteTheCall'
        - CommandLine|contains|all:
            - 'shell32.dll'
            - 'Control_RunDLL'
        - CommandLine|contains|all:
            - 'shell32.dll'
            - 'ShellExec_RunDLL'
        - CommandLine|contains|all:
            - 'mshtml.dll'
            - 'PrintHTML'
        - CommandLine|contains|all:
            - 'advpack.dll'
            - 'LaunchINFSection'
        - CommandLine|contains|all:
            - 'advpack.dll'
            - 'RegisterOCX'
        - CommandLine|contains|all:
            - 'ieadvpack.dll'
            - 'LaunchINFSection'
        - CommandLine|contains|all:
            - 'ieadvpack.dll'
            - 'RegisterOCX'
        - CommandLine|contains|all:
            - 'ieframe.dll'
            - 'OpenURL'
        - CommandLine|contains|all:
            - 'shdocvw.dll'
            - 'OpenURL'
        - CommandLine|contains|all:
            - 'syssetup.dll'
            - SetupInfObjectInstallAction'
        - CommandLine|contains|all:
            - 'setupapi.dll'
            - 'InstallHinfSection'
        - CommandLine|contains|all:
            - 'pcwutl.dll'
            - 'LaunchApplication'
        - CommandLine|contains|all:
            - 'dfshim.dll'
            - 'ShOpenVerbApplication'
    condition: selection
falsepositives:
    - False positives depend on scripts and administrative tools used in the monitored environment
level: medium