SigmaHQ Detections
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Detects network connections to Devtunnels domains initiated by a process on a system. Attackers can abuse that feature to establish a reverse shell or persistence on a machine.
Detects the suspicious loading of `vss_ps.dll` by executables that are not typically associated with the Volume Shadow Copy Service (VSS). This DLL is often abused by attackers to delete or manipulate shadow copies, which can hinder forensic investigations and data recovery efforts, commonly seen in ransomware attacks or other destructive operations. The rule filters out known legitimate processes and common program file locations to reduce false positives.
Detects the creation of files with suspicious file extensions in the temporary directory that Outlook uses when opening attachments.
This can be used to detect spear-phishing campaigns that use suspicious files as attachments, which may contain malicious code.
This can be used to detect spear-phishing campaigns that use suspicious files as attachments, which may contain malicious code.
Detects calls to PowerShell with Invoke-WebRequest cmdlet using direct IP access
This rule detects attempts to transfer sensitive files containing credential data via network shares. It specifically looks for Event ID 5145 (A network share object was checked to see whether client can be granted desired access) and checks if the 'RelativeTargetName' of the accessed object contains well-known filenames or paths associated with credential storage, such as Mimikatz output, LSASS memory dumps, Windows minidumps, hibernation files, SQL dumps, or critical system files like NTDS.dit, SAM, SECURITY, and SYSTEM hives.
Detects potential Active Directory enumeration via LDAP. This rule identifies suspicious LDAP search filters and distinguished name enumerations that are commonly used by reconnaissance tools like PowerView and SharpHound to gather information about users, groups, computers, and domain trusts within an Active Directory environment. The rule specifically looks for various 'groupType', 'sAMAccountType', 'objectCategory', 'objectClass', 'primaryGroupID', 'userAccountControl' attributes, and specific distinguished names or flags that indicate detailed AD reconnaissance.
Detects the execution of PowerShell commandlets commonly associated with well-known PowerShell exploitation frameworks and tools. This rule identifies specific commandlet names within process command lines, indicating potential malicious activity such as credential dumping, reconnaissance, privilege escalation, persistence, and lateral movement.
Detects suspicious Kerberos Ticket Granting Ticket (TGT) requests where pre-authentication is disabled (Pre-Authentication Type = 0) and the ticket encryption type is RC4-HMAC (0x17). This combination is indicative of an AS-REP Roasting attack, where an adversary requests AS-REP messages for accounts without pre-authentication and attempts to crack the encrypted ticket offline to recover user passwords.
Detects the creation of known offensive PowerShell scripts used for exploitation, reconnaissance, credential access, persistence, and other malicious activities. The rule identifies specific filenames associated with popular PowerShell offensive security frameworks and tools.
Detects the deletion of the "Zone.Identifier" Alternate Data Stream (ADS) by an uncommon process. Attackers can leverage this to bypass security restrictions that rely on the ADS, such as those in Microsoft Office applications, which use the Mark-of-the-Web (MOTW) to flag files downloaded from the internet.
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