SigmaHQ Detections
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This rule detects the use of the PowerShell cmdlet 'Get-SmbShare', which adversaries may use to discover shared folders and drives on remote systems. This information can be leveraged for data collection or lateral movement within a network.
Adversaries may acquire credentials from web browsers by reading files specific to the target browser. This rule detects PowerShell commands attempting to copy browser login data files from common web browsers like Opera, Firefox, Microsoft Edge, and Google Chrome.
Detects PowerShell execution that enumerates Active Directory users with the 'DONT_REQ_PREAUTH' flag set (UserAccountControl flag 4194304). This flag indicates that the account does not require Kerberos pre-authentication, making it vulnerable to AS-REP Roasting attacks where an attacker can request a Ticket Granting Ticket (TGT) without providing credentials and then attempt to crack the hash offline.
Detects attempts to modify Group Policy settings related to system behavior or security features by analyzing PowerShell script block logs. This rule specifically looks for modifications to registry paths associated with Group Policy settings, such as refresh times or SmartScreen configurations, which could indicate an adversary attempting to establish persistence, evade defenses, or escalate privileges.
This rule detects PowerShell scripts that enumerate directories using `Get-ChildItem` and output the results to a file using `Out-File -append`. The detection logic specifically looks for the combination of `foreach`, `Get-ChildItem`, `-Path`, `-ErrorAction SilentlyContinue`, `Out-File`, and `-append` within the PowerShell script block text. This behavior has been associated with MAZE ransomware for directory discovery.
Detects the execution of SyncAppvPublishingServer.exe, which is often used by adversaries to bypass PowerShell execution restrictions. This technique is part of the LOLBAS (Living Off The Land Binaries and Scripts) project, where legitimate system binaries are abused for malicious purposes, specifically to execute PowerShell commands in a way that might evade traditional security controls.
This rule detects PowerShell scripts that query WMI for service information, specifically looking for the 'Win32_Service' class and requesting 'Name', 'DisplayName', 'PathName', and 'StartMode' properties. This activity is often associated with reconnaissance for unquoted service path vulnerabilities, a common technique used by penetration testers and attackers for privilege escalation.
This rule detects the use of the `attrib.exe` utility to hide files by setting the hidden attribute (`+h`). Adversaries often use this technique to conceal malicious files or directories from users and basic forensic analysis, aiding in defense evasion. The rule specifically looks for the execution of `attrib.exe` with the `+h` command-line argument.
Detects the execution of a Chromium-based browser process with the "--headless" flag and a URL pointing to mockbin.org or run.mocky.io. This activity can indicate an attempt to exfiltrate data or use the browser in an automated, potentially malicious, fashion without a visible user interface.
This rule detects the use of `find.exe` or `findstr.exe` to search for the string 'cpassword' within XML files located in the SYSVOL share. This activity is indicative of an adversary attempting to locate encrypted Group Policy Preferences (GPP) passwords, which can then be decrypted to obtain credentials.
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