SigmaHQ Detections
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Detects specific command-line patterns associated with Empire PowerShell UAC bypass methods. These patterns involve PowerShell commands designed to retrieve and execute content from the 'Update' registry key within 'HKCU:Software\Microsoft\Windows Update', which is a known technique used by Empire for privilege escalation.
This rule detects the execution of the Hashcat password cracking tool. It specifically looks for the `hashcat.exe` executable and command-line arguments indicative of cracking NTLM hashes (`-m 1000`) and using a rule file (`-r `). The rule aims to identify attempts to crack passwords, potentially using SAM file contents obtained from a Windows registry.
Detects the use of Jlaive, a hack tool, to execute assemblies in a copied PowerShell instance. This technique involves using `xcopy.exe` to copy `powershell.exe` or `pwsh.exe` to a new name ending with `.bat.exe`, and then using `attrib.exe` to set system and hidden attributes on this file, likely to evade detection and execute malicious code.
Detects the execution of Quarks PwDump, a tool used for dumping credentials, by monitoring process creation events for its executable name and specific command-line arguments. The rule looks for 'QuarksPwDump.exe' and various flags associated with dumping local hashes, domain cached hashes, BitLocker keys, and domain hashes, including those from NTDS files.
This rule detects the execution of the Windows Kernel Debugger, 'kd.exe'. While kernel debuggers are legitimate tools, their execution in a production environment can indicate attempts at defense evasion, privilege escalation, or in-depth system analysis by an adversary. The rule specifically looks for the executable name 'kd.exe' either in the image path or the original file name.
Detects the execution of the Windows LOLBIN (Living Off The Land Binary) PrintBrm.exe when it is used to create or extract ZIP files. This activity is generally not expected on a normal workstation and can indicate malicious use for data staging or exfiltration.
This rule detects the execution of arbitrary PowerShell code using SyncAppvPublishingServer.exe. Adversaries may abuse this legitimate Windows binary to proxy execution of malicious PowerShell commands, often as a method of defense evasion and to bypass PowerShell execution restrictions. The detection specifically looks for the execution of 'SyncAppvPublishingServer.exe' or 'syncappvpublishingserver.exe' with a command line containing '"n; ' which is a known pattern for invoking PowerShell via this binary.
Detects suspicious child processes spawned by Microsoft OneNote. This rule identifies attempts to execute malicious embedded objects from a .one file by monitoring for OneNote spawning known LOLBINs (Living Off the Land Binaries) or executables from suspicious paths. This behavior is often associated with initial access and execution techniques used by adversaries.
Detects PowerShell scripts attempting to modify Access Control Lists (ACLs) on files or directories within the Windows system folders. This activity can be indicative of an adversary trying to elevate privileges, establish persistence, or evade defenses by modifying critical system file permissions.
Detects PowerShell command-line obfuscation techniques, specifically those associated with Invoke-Obfuscation, by looking for patterns like backticks, string concatenation, and format string abuse in process command lines. It also includes a specific pattern for obfuscated environment variable access.
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