Query: detect Detect suspicious Kerberos TGT requests. Once an attacer obtains a computer certificate by abusing Active Directory Cert in logs
Matching passage: Sigma rule: Detect suspicious Kerberos TGT requests. Once an attacer obtains a computer certificate by abusing Active Directory Cert. Logsource: windows / security. Rule: title: PetitPotam Suspicious Kerberos TGT Request id: 6a53d871-682d-40b6-83e0-b7c1a6c4e3a5 status: test description: 'Detect suspicious Kerberos TGT requests. Once an attacer obtains a computer certificate by abusing Active Directory Certificate Services in combination with PetitPotam, the next step would be to leverage the certificate for malicious purposes. One way of doing this is to request a Kerberos Ticket Granting Ticket using a tool like Rubeus. This request will generate a 4768 event with some unusual fields depending on the environment. This analytic will require tuning, we recommend filtering Account_Name to the Domain Controller computer accounts. ' references: - https://github.com/topotam/PetitPotam - https://isc.sans.edu/forums/diary/Active+Directory+Certificate+Services+ADCS+PKI+domain+admin+vulnerability/27668/ - https://github.com/splunk/security_content/blob/88d689fe8a055d8284337b9fad5d9152b42043db/detections/endpoint/petitpotam_suspicious_kerberos_tgt_request.yml author: Mauricio Velazco, Michael Haag date: 2021-09-02 modified: 2022-10-05 tags: - attack.credential-access - attack.t1187 logsource: product: windows service: security definition: The advanced audit policy setting "Account Logon > Kerberos Authentication Service" must be configured for Success/Failure detection: selection: EventID: 4768 TargetUserName|endswith: $ CertThumbprint|contains: '*' filter_local: IpAddress: ::1 filter_thumbprint: CertThumbprint: '' condition: selection and not 1 of filter_* falsepositives: - False positives are possible if the environment is using certificates for authentication. We recommend filtering Account_Name to the Domain Controller computer accounts. level: high
Near-miss passage: Sigma rule: Detects the occurrence of numerous space characters in TypedPaths registry paths, which may indicate execution via phish. Logsource: windows / registry_set. Rule: title: Suspicious Space Characters in TypedPaths Registry Path - FileFix id: 8f2a5c3d-9e4b-4a7c-8d1f-2e5a6b9c3d7e related: - id: 3ae9974a-eb09-4044-8e70-8980a50c12c8 type: similar status: experimental description: 'Detects the occurrence of numerous space characters in TypedPaths registry paths, which may indicate execution via phishing lures using file-fix techniques to hide malicious commands. ' references: - https://expel.com/blog/cache-smuggling-when-a-picture-isnt-a-thousand-words/ - https://mrd0x.com/filefix-clickfix-alternative/ author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2025-11-04 tags: - attack.execution - attack.stealth - attack.t1204.004 - attack.t1027.010 logsource: category: registry_set product: windows detection: selection_key: TargetObject|endswith: \Software\Microsoft\Windows\CurrentVersion\Explorer\TypedPaths\url1 Details|contains: '#' selection_space_variation: Details|contains: - - - - - - - - - - - - - ' ' condition: all of selection_* falsepositives: - Unlikely level: high