Ibrahim Saud
@tektrixIndiaCompletionist
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11,679 detections
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Detects unauthorized directory service access requests (Event ID 4662) utilizing the 'DS-Replication-Get-Changes' or 'DS-Replication-Get-Changes-All' extended rights GUIDs. These rights are required for the DCSync technique used by tools like Mimikatz or Impacket to replicate Active Directory data. The rule specifically flags when such requests originate from a non-domain controller host, which is a strong indicator of credential theft or unauthorized replication attempts.
Detects the issuance or renewal of Kerberos Ticket-Granting Tickets (TGT) (Event IDs 4768 and 4769) where the ticket lifetime or renewal duration exceeds standard Windows domain Kerberos policy defaults (typically 10 hours for lifetime and 7 days for renewal). Deviations from these standard thresholds are common indicators of forged Golden Tickets created using an exfiltrated KRBTGT hash.
Detects network connections originating from or connecting to hosts that utilize known Cobalt Strike default JA3 or JA3S TLS fingerprints. These fingerprints are indicative of Cobalt Strike's default beacon communication patterns.
Detects the execution of the rclone utility (including renamed binaries) using command-line arguments consistent with data exfiltration or synchronization (copy, sync, move) that is followed by network communication to known cloud storage providers commonly abused for staging and exfiltration in ransomware attacks.
Detects suspicious PowerShell execution patterns involving encoded commands, hidden window styles, or common download cradles combined with code obfuscation techniques. This rule monitors PowerShell ScriptBlock Logging (Event ID 4104) for combinations of indicators often used by threat actors to evade detection, such as Base64-encoded strings, hidden execution flags, network download utilities, and script obfuscation techniques.
Detects the creation of scheduled tasks using the 'schtasks.exe' utility that point to suspicious script execution, encoded commands, or files located in commonly abused writable directories like Temp or ProgramData. This behavior is indicative of potential persistence mechanisms.
Detects Kerberos service ticket requests (Event ID 4769) that utilize weak RC4 encryption (0x17). This behavior is characteristic of Kerberoasting, where attackers request service tickets for service accounts in order to perform offline brute-force attacks to recover the service account password. The rule filters out machine account requests and focuses on standard user or service account requests.
Detects the loading of known-vulnerable signed drivers typically associated with 'Bring Your Own Vulnerable Driver' (BYOVD) attacks. These drivers are frequently abused to gain kernel-mode privileges, allowing attackers to disable or terminate EDR, antivirus, and other security processes.
Detects user-granted OAuth consent in Microsoft Entra ID (formerly Azure AD) involving high-risk scopes such as Mail.Read, Files.ReadWrite.All, or offline_access. This pattern is characteristic of illicit consent-grant phishing, where attackers entice users to authorize malicious applications to bypass multi-factor authentication (MFA) and establish persistent, programmatic access to sensitive mailbox and file resources.
Detects modifications to Windows Registry persistence keys (Run, RunOnce, RunServices, RunServicesOnce) where the referenced executable or script path resides in low-trust locations such as AppData, Temp, or Public directories. This pattern is commonly used by adversaries to establish persistence after initial execution.
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