Potential DLL Sideloading Of KeyScramblerIE.DLL Via KeyScrambler.EXE — Sigma Rule

Rule metadata and linked tags

Author: Swachchhanda Shrawan Poudel. Source status: test; severity: high. Source dates: 2024-04-15 / not supplied.

{
  "category": "image_load",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: e9fd7bf541363cbc8d26e56c0b9a42e3ef96dcd5ebee165789d69be7ef809b4d

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Potential DLL Sideloading Of KeyScramblerIE.DLL Via KeyScrambler.EXE
id: d2451be2-b582-4e15-8701-4196ac180260
related:
    - id: ca5583e9-8f80-46ac-ab91-7f314d13b984
      type: similar
status: test
description: |
    Detects potential DLL side loading of "KeyScramblerIE.dll" by "KeyScrambler.exe".
    Various threat actors and malware have been found side loading a masqueraded "KeyScramblerIE.dll" through "KeyScrambler.exe".
references:
    - https://thehackernews.com/2024/03/two-chinese-apt-groups-ramp-up-cyber.html
    - https://csirt-cti.net/2024/02/01/stately-taurus-continued-new-information-on-cyberespionage-attacks-against-myanmar-military-junta/
    - https://bazaar.abuse.ch/sample/5cb9876681f78d3ee8a01a5aaa5d38b05ec81edc48b09e3865b75c49a2187831/
    - https://twitter.com/Max_Mal_/status/1775222576639291859
    - https://twitter.com/DTCERT/status/1712785426895839339
author: Swachchhanda Shrawan Poudel
date: 2024-04-15
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        Image|endswith:
            - '\KeyScrambler.exe'
            - '\KeyScramblerLogon.exe'
        ImageLoaded|endswith: '\KeyScramblerIE.dll'
    filter_main_legitimate_path:
        Image|contains:
            - 'C:\Program Files (x86)\KeyScrambler\'
            - 'C:\Program Files\KeyScrambler\'
        ImageLoaded|contains:
            - 'C:\Program Files (x86)\KeyScrambler\'
            - 'C:\Program Files\KeyScrambler\'
    filter_main_signature:
        Signature: 'QFX Software Corporation'
        SignatureStatus: 'Valid'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://thehackernews.com/2024/03/two-chinese-apt-groups-ramp-up-cyber.html
• https://csirt-cti.net/2024/02/01/stately-taurus-continued-new-information-on-cyberespionage-attacks-against-myanmar-military-junta/
• https://bazaar.abuse.ch/sample/5cb9876681f78d3ee8a01a5aaa5d38b05ec81edc48b09e3865b75c49a2187831/
• https://twitter.com/Max_Mal_/status/1775222576639291859
• https://twitter.com/DTCERT/status/1712785426895839339