Sigma rule: Hacktool - EDR-Freeze Execution

Rule

Title

Hacktool - EDR-Freeze Execution

Status

experimental

Level

high

Author

Swachchhanda Shrawan Poudel (Nextron Systems)

Date

2025-09-24

Modified

2025-11-27

File

rules/windows/process_creation/proc_creation_win_hktl_edr_freeze.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects execution of EDR-Freeze, a tool that exploits the MiniDumpWriteDump function and WerFaultSecure.exe to suspend EDR and Antivirus processes on Windows.
EDR-Freeze leverages a race-condition attack to put security processes into a dormant state by suspending WerFaultSecure at the moment it freezes the target process.
This technique does not require kernel-level exploits or BYOVD, but instead abuses user-mode functionality to temporarily disable monitoring by EDR or Antimalware solutions.

Log source

product

windows

category

process_creation

Detection

selection_img:
    Image|contains:
        - '\EDR-Freeze'
        - '\EDRFreeze'
    Image|endswith: '.exe'
selection_imphash:
    Hashes|contains:
        - 'IMPHASH=1195F7935954A2CD09157390C33F8E8C'
        - 'IMPHASH=129F58DE3D687FB7F012BF6C3D679997'
        - 'IMPHASH=2C617A175D0086251642C6619F7CC8BA'
        - 'IMPHASH=8828F0B906F7844358FB92A899E9520F'
        - 'IMPHASH=AF76D95157EC554DC1EF178E4E66D447'
        - 'IMPHASH=E1B04316B61ACA31DD52ABBEC0A37FD5'
        - 'IMPHASH=8B2D5B54AFCFEC60D54F6B31D80ED4A0'
        - 'IMPHASH=AB8BB31EDD91D2A05FE7B62A535E9EB7'
condition: 1 of selection_*

False positives (as the rule lists them)

• Unlikely

Tags

• attack.defense-impairment
• attack.t1685

MITRE ATT&CK ids this rule names

• T1685

References

• https://www.zerosalarium.com/2025/09/EDR-Freeze-Puts-EDRs-Antivirus-Into-Coma.html
• https://github.com/TwoSevenOneT/EDR-Freeze

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_hktl_edr_freeze.yml