Convert indexed Sigma rules into analyst-ready detections.

title: Qakbot Rundll32 Exports Execution
id: 339ed3d6-5490-46d0-96a7-8abe33078f58
status: test
description: Detects specific process tree behavior of a "rundll32" execution with exports linked with Qakbot activity.
references:
    - https://github.com/pr0xylife/Qakbot/
author: X__Junior (Nextron Systems)
date: 2023-05-24
modified: 2023-05-30
tags:
    - attack.defense-evasion
    - attack.execution
    - detection.emerging-threats
logsource:
    product: windows
    category: process_creation
detection:
    selection_paths:
        ParentImage|endswith:
            # Note: Only add processes seen used by Qakbot to avoid collision with other strains of malware
            - '\cmd.exe'
            - '\cscript.exe'
            - '\curl.exe'
            - '\mshta.exe'
            - '\powershell.exe'
            - '\pwsh.exe'
            - '\wscript.exe'
        Image|endswith: '\rundll32.exe'
        CommandLine|contains:
            # Note: Only add paths seen used by Qakbot to avoid collision with other strains of malware
            - ':\ProgramData\'
            - ':\Users\Public\'
            - '\AppData\Local\Temp\'
            - '\AppData\Roaming\'
    selection_exports:
        CommandLine|endswith:
            # Note: Only add additional exports seen used by Qakbot
            - 'aslr' # https://tria.ge/230524-scgq9add9v/behavioral1#report
            - 'bind'
            - 'DrawThemeIcon'
            - 'GG10'
            - 'GL70'
            - 'jhbvygftr'
            - 'kjhbhkjvydrt'
            - 'LS88'
            - 'Motd'
            - 'N115'
            - 'next' # https://tria.ge/230530-n3rxpahf9w/behavioral2
            - 'Nikn'
            - 'print'
            - 'qqqb'
            - 'qqqq'
            - 'RS32'
            - 'Test'
            - 'Time'
            - 'Updt'
            - 'vips'
            - 'Wind'
            - 'WW50'
            - 'X555'
            - 'XL55'
            - 'xlAutoOpen'
            - 'XS88'
    condition: all of selection_*
falsepositives:
    - Unlikely
level: critical