Sigma detection rules, expert-reviewed

PowerShell Module: Get-SmbShare Used for SMB Share Discovery

Detects PowerShell module usage of Get-SmbShare to enumerate SMB shares across networked systems.

PowerShell module enumeration of AD principals via get-ADPrincipalGroupMembership

Flags PowerShell module usage of Get-ADPrincipalGroupMembership and Get-ADUser with -pr -f patterns indicative of AD discovery.

Windows Directory Services: CVE-2021-42287 SAMAccountName spoofing validation failures

Looks for Directory Services SAM validation failures (Event 16990/16991) that may indicate CVE-2021-42287 exploitation attempts.

Windows Kerberos Key Distribution Center: CVE-2021-42278 Exploitation Attempt Indicators (Event 35–38)

Alerts on Windows Kerberos KDC ticket anomalies (EventIDs 35–38) associated with CVE-2021-42278 exploitation attempts.

Windows process execution of where.exe with browser bookmark database or history artifacts

Alerts on where.exe executions referencing browser history/bookmarks/cookie database artifacts in the command line.

Windows: Delete Backup or System State Backups via wbadmin.exe

Flags wbadmin.exe command lines that delete backup or system state backups, potentially impacting recovery.

Windows wbadmin.exe Deletes All Backup Copies (keepVersions:0)

Flags wbadmin.exe executions that delete all backups/system state backups using keepVersions:0.

Windows PUA: Suspicious Active Directory enumeration using AdFind.exe flags

Flags AdFind.exe processes that look like Active Directory discovery via password policy and object enumeration options.

Windows CMD dir /S File and Subfolder Enumeration

Flags cmd.exe executions using dir with the /S flag to enumerate files in a directory and all subdirectories.

PowerShell Script Block Collection of Browser Bookmarks via Get-ChildItem

Detects PowerShell Get-ChildItem activity used to recursively enumerate browser bookmarks from a target path.

Windows Process Discovery via wmic.exe "group" Flag

Flags wmic.exe process executions querying local group information via a "group" command-line argument.

PowerShell Suspicious Discovery of Local Groups via Get-LocalGroup Cmdlets

Flags PowerShell commands that enumerate local groups and group membership, including WMI/CIM queries for Win32 group data.

PowerShell Local Group Discovery via Get-LocalGroup and Get-LocalGroupMember (Windows)

Identifies PowerShell commands enumerating local groups and their members, indicating potential local permission discovery.

Webserver JNDI-Exploit-Kit Exploitation Indicators via Known Payload Paths

Flags webserver requests whose URL paths match known JNDI-Exploit-Kit exploit, deserialization, and memshell pattern strings.

Windows Process Discovery via tasklist Command Execution

Alerts on Windows executions of tasklist.exe used for running process discovery.