Query: Sigma rule for Detects potential abuse of WerFaultSecure.exe to dump Protected Process Light (PPL) processes like LSASS or to freeze se
Matching passage: Sigma rule: Detects potential abuse of WerFaultSecure.exe to dump Protected Process Light (PPL) processes like LSASS or to freeze se. Logsource: windows / process_creation. Rule: title: PPL Tampering Via WerFaultSecure id: 1f0b4cac-9c81-41f4-95d0-8475ff46b3e2 related: - id: 387df17d-3b04-448f-8669-9e7fd5e5fd8c type: similar - id: 8a2f4b1c-3d5e-4f7a-9b2c-1e4f6d8a9c2b type: similar status: experimental description: 'Detects potential abuse of WerFaultSecure.exe to dump Protected Process Light (PPL) processes like LSASS or to freeze security solutions (EDR/antivirus). This technique is used by tools such as EDR-Freeze and WSASS to bypass PPL protections and access sensitive information or disable security software. Distinct command line patterns help identify the specific tool: - WSASS usage typically shows: "WSASS.exe WerFaultSecure.exe [PID]" in ParentCommandLine - EDR-Freeze usage typically shows: "EDR-Freeze_[version].exe [PID] [timeout]" in ParentCommandLine Legitimate debugging operations using WerFaultSecure are rare in production environments and should be investigated. ' references: - https://www.zerosalarium.com/2025/09/EDR-Freeze-Puts-EDRs-Antivirus-Into-Coma.html - https://github.com/TwoSevenOneT/EDR-Freeze/blob/a7f61030b36fbde89871f393488f7075d2aa89f6/EDR-Freeze.cpp#L53 - https://www.zerosalarium.com/2025/09/Dumping-LSASS-With-WER-On-Modern-Windows-11.html - https://github.com/TwoSevenOneT/WSASS/blob/2c8fd9fa32143e7bc9f066e9511c6f8a57bc64b5/WSASS.cpp#L251 author: Jason (https://github.com/0xbcf) date: 2025-09-23 modified: 2025-11-23 tags: - attack.defense-impairment - attack.t1685 - attack.credential-access - attack.t1003.001 logsource: category: process_creation product: windows detection: selection_image: - Image|endswith: \WerFaultSecure.exe - OriginalFileName: WerFaultSecure.exe selection_args: CommandLine|contains|all: - ' /h ' - ' /pid ' - ' /tid ' - ' /encfile ' - ' /cancel ' - ' /type ' - ' 268310' condition: all of selection_* falsepositives: - Legitimate usage of WerFaultSecure for debugging purposes level: high regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_werfaultsecure_abuse/info.yml
Near-miss passage: Sigma rule: Ensure that all account usernames and authentication credentials are transmitted across networks using encrypted channel. Logsource: firewall. Rule: title: Cleartext Protocol Usage id: d7fb8f0e-bd5f-45c2-b467-19571c490d7e status: stable description: 'Ensure that all account usernames and authentication credentials are transmitted across networks using encrypted channels. Ensure that an encryption is used for all sensitive information in transit. Ensure that an encrypted channels is used for all administrative account access. ' references: - https://www.cisecurity.org/controls/cis-controls-list/ - https://www.pcisecuritystandards.org/documents/PCI_DSS_v3-2-1.pdf - https://nvlpubs.nist.gov/nistpubs/CSWP/NIST.CSWP.04162018.pdf author: Alexandr Yampolskyi, SOC Prime, Tim Shelton date: 2019-03-26 modified: 2022-10-10 tags: - attack.credential-access logsource: category: firewall detection: selection: dst_port: - 8080 - 21 - 80 - 23 - 50000 - 1521 - 27017 - 3306 - 1433 - 11211 - 15672 - 5900 - 5901 - 5902 - 5903 - 5904 selection_allow1: action: - forward - accept - 2 selection_allow2: blocked: 'false' condition: selection and 1 of selection_allow* falsepositives: - Unknown level: low