Fake Signature

Created the Monday 18 March 2019. Updated 3 years, 10 months ago.

Every exe file contain metadata that allow users to trust the third party that distribute the program. Malware are able to usurp the metadata in order to fool the user but also the security tools.

Technique Identifier

U0506

Detection Rules

                                    rule:
  meta:
    name: impersonate file version information
    namespace: anti-analysis/anti-forensic
    authors:
      - awillia2@cisco.com
    description: Looks for Windows API calls associated with reading and then writing file version information of executables on disk. Malware can use these calls to overwrite its own version information with that of a legitimate executable on the system (for instance, explorer.exe) to make it appear to be a legitimate application.
    scope: function
    att&ck:
      - Defense Evasion::Indicator Removal on Host [T1070]
    references:
      - https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-updateresourcea
      - https://www.carbonblack.com/blog/threat-analysis-dont-forget-about-kangaroo-ransomware/
    examples:
      - e5369ac309f1be6d77afeeb3edab0ed8:0x4025A0
  features:
    - and:
      - match: get file version info
      - api: kernel32.BeginUpdateResource
      - api: kernel32.UpdateResource
      - api: kernel32.EndUpdateResource

Additional Resources

External Links

The resources provided below are associated links that will give you even more detailed information and research on current evasion technique. It is important to note that, while these resources may be helpful, it is important to exercise caution when following external links. As always, be careful when clicking on links from unknown sources, as they may lead to malicious content.

https://www.mcafee.com/us/resources/reports/rp-quarterly-threats-jun-2017.pdf

Fake Signature

Technique Identifier

Detection Rules

Additional Resources

External Links

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