Query: rule covering Detect suspicious Kerberos TGT requests. Once an attacer obtains a computer certificate by abusing Active Directory Cert
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 execution of Sysinternals ADExplorer with the "-snapshot" flag in order to save a local copy of the active d. Logsource: windows / process_creation. Rule: title: Suspicious Active Directory Database Snapshot Via ADExplorer id: ef61af62-bc74-4f58-b49b-626448227652 related: - id: 9212f354-7775-4e28-9c9f-8f0a4544e664 type: derived status: test description: Detects the execution of Sysinternals ADExplorer with the "-snapshot" flag in order to save a local copy of the active directory database to a suspicious directory. This can be used by attackers to extract data for Bloodhound, usernames for password spraying or use the meta data for social engineering. The snapshot doesn't contain password hashes but there have been cases, where administrators put passwords in the comment field. references: - https://www.documentcloud.org/documents/5743766-Global-Threat-Report-2019.html - https://learn.microsoft.com/de-de/sysinternals/downloads/adexplorer - https://github.com/c3c/ADExplorerSnapshot.py/tree/f700904defac330802bbfedd1d8ffd9248f4ee24 - https://www.packetlabs.net/posts/scattered-spider-is-a-young-ransomware-gang-exploiting-large-corporations/ - https://www.nccgroup.com/us/research-blog/lapsus-recent-techniques-tactics-and-procedures/ - https://trustedsec.com/blog/adexplorer-on-engagements author: Nasreddine Bencherchali (Nextron Systems) date: 2023-03-14 modified: 2025-07-09 tags: - attack.discovery - attack.t1087.002 - attack.t1069.002 - attack.t1482 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: - \ADExp.exe - \ADExplorer.exe - \ADExplorer64.exe - \ADExplorer64a.exe - OriginalFileName: AdExp - Description: Active Directory Editor - Product: Sysinternals ADExplorer selection_flag: CommandLine|contains: snapshot selection_paths: CommandLine|contains: - \Downloads\ - \Users\Public\ - \AppData\ - \Windows\Temp\ condition: all of selection_* falsepositives: - Unknown level: high