SigmaHQ Detections
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Detects when an Office application loads the 'kerberos.dll' library. This behavior is unusual for standard Office operations and could indicate an attempt to manipulate Kerberos authentication, potentially for credential access or privilege escalation.
Detects the creation of named pipes commonly used by credential dumping tools such as Mimikatz (wceservicepipe) and other tools that might use 'cachedump' or 'lsadump' in their pipe names to extract credentials.
This rule detects instances where PowerShell is invoked, and there's a mismatch between the PowerShell engine version and the host version. Specifically, it looks for PowerShell classic start events where the 'Data' field contains an 'EngineVersion' of 2, 4, or 5, while simultaneously containing a 'HostVersion' of 3. This version mismatch can indicate attempts to evade detection or exploit vulnerabilities by using an older or specific PowerShell engine version within a newer host environment.
Detects the execution of SyncAppvPublishingServer.exe, which can be abused by adversaries to bypass PowerShell execution restrictions. This rule specifically looks for the string 'SyncAppvPublishingServer.exe' within the 'ContextInfo' field of PowerShell module logs, indicating its use in a PowerShell context.
Detects the execution of ADRecon.ps1, a PowerShell script used for Active Directory reconnaissance. The rule identifies specific function names and a default report filename commonly found within the ADRecon script. This tool has been reported to be actively used by the FIN7 threat group.
This rule detects suspicious PowerShell activity involving the mounting of a disk image (like ISO or VHD) and then immediately invoking an item from that mounted image. This technique is often used by adversaries to bypass Mark-of-the-Web (MOTW) protections, as files extracted or run from mounted disk images may not inherit the MOTW flag, allowing malicious payloads to execute without security warnings.
Detects suspicious PowerShell invocation command parameters such as encoded commands, hidden window styles, and non-interactive modes. These parameters are frequently used by adversaries to obfuscate malicious scripts, execute them stealthily, or prevent user interaction.
Detects access to the LSASS process by a Python-based tool, indicated by specific call trace patterns involving Python DLLs and KERNELBASE.dll/ntdll.dll, combined with a broad granted access right (0x1FFFFF). This activity is characteristic of credential dumping tools like LaZagne or Pypykatz.
Detects the execution of 7-Zip (7z.exe, 7za.exe, 7zr.exe) to compress files with extensions like '.dmp', '.dump', or '.hdmp'. This activity is often a precursor to data exfiltration, where memory dump files or other sensitive data are compressed for easier transfer.
Detects the use of bitsadmin.exe to download files with suspicious extensions. This technique is often used by adversaries for defense evasion and persistence by leveraging a legitimate Windows utility to transfer malicious payloads.
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