SigmaHQ Detections
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This rule detects the execution of the `Get-ADReplAccount` cmdlet from the DSInternals PowerShell module with specific parameters (`-All` and `-Server`). This cmdlet is used to perform a DCSync attack, which allows an attacker to retrieve password hashes and other sensitive Active Directory information by simulating a domain controller replication. The DSInternals module provides advanced capabilities for Active Directory manipulation and auditing, and its use in this manner is highly suspicious and indicative of credential access attempts.
This rule detects PowerShell scripts attempting to use specific Windows API functions that are commonly associated with malicious activities such as process injection (VirtualAlloc, OpenProcess, WriteProcessMemory, CreateRemoteThread), token manipulation (OpenProcessToken, LookupPrivilegeValue, AdjustTokenPrivileges, DuplicateTokenEx), and memory operations (ReadProcessMemory, VirtualFree). Detection relies on PowerShell Script Block Logging being enabled to capture the script content.
This rule detects the execution of 'git.exe' or 'git-remote-https.exe' when attempting to clone a remote repository. The detection is specifically triggered if the command line arguments contain keywords commonly associated with exploits, vulnerabilities, or proof-of-concept code, such as 'exploit', 'Vulns', 'vulnerability', 'RemoteCodeExecution', 'Invoke-', 'CVE-', 'poc-', 'ProofOfConcept', 'proxyshell', 'log4shell', 'eternalblue', 'eternal-blue', or 'MS17-'. This aims to identify reconnaissance activities where adversaries might be searching for or downloading publicly available exploit code.
This rule detects the execution of 'plink.exe' with command-line arguments indicative of RDP tunneling. Specifically, it looks for 'plink.exe' combined with ':127.0.0.1:3389' or ':3389' along with '-P 443' or '-P 22'. This activity suggests an adversary is using Plink to establish a tunnel, potentially to exfiltrate data or maintain covert access to a remote desktop session.
This rule detects the execution of PowerShell scripts where the script path explicitly includes or references the "C:\Users\Public" directory. This directory is often used by adversaries to store and execute malicious scripts due to its default write permissions for all users, making it a common location for staging and executing payloads.
Detects suspicious modifications to BitLocker-related registry keys using the `reg.exe` utility. Adversaries may modify these keys to enable or disable BitLocker, potentially as a precursor to data encryption for impact (ransomware) or to facilitate data exfiltration by disabling encryption.
Detects the use of the 'reg.exe' utility to disable Protected Process Light (PPL) protection for the Local Security Authority (LSA) process. This modification can allow attackers to dump LSA secrets, which contain credential material.
Detects an attempt to dump credentials from the VeeamBackup database using sqlcmd.exe by querying the 'VeeamBackup.dbo.Credentials' table. This activity is indicative of an attacker trying to extract sensitive information, potentially for lateral movement or further compromise.
Detects the execution of copy commands or utilities (robocopy, xcopy, cmd copy, PowerShell Copy-Item/Move-Item) targeting or originating from Windows Admin shares (e.g., C$) or the Sysvol folder. This activity can indicate lateral movement, data collection, or exfiltration by an adversary.
This rule detects the potential use of an SSH utility to establish Remote Desktop Protocol (RDP) over a reverse SSH Tunnel. Attackers commonly use this technique to enable routing of network packets that would otherwise not reach their intended destination, bypassing network segmentation or firewalls. The detection logic looks for command-line arguments containing the RDP port ':3389' in conjunction with common SSH tunneling switches such as '-L', '-P', '-R', '-pw', or '-ssh'.
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