Sigma detection rules, expert-reviewed

Suspicious SMB Insecure Guest Authentication Activated - Native (via security)

This rule detects enable insecure guest authentication in order to access a remote storage device (NAS) in order to perform some data exfiltration or lateral movement.

Malicious Rundll32 Loading an Export From a User Path (via process_creation)

This rule detects rundll32.exe executing a named or ordinal export from a DLL located in AppData, ProgramData or Temp, the execution behavior IcedID and Bumblebee use to run a downloaded loader. Rundll32 export execution from user-writable paths is a defense-evasion technique tracked in the Red Canary Threat Detection Report. Detecting these invocations surfaces malware loaders running under a signed binary.

Possible Clipboard Data Capture via PowerShell (via process_creation)

This rule detects PowerShell reading the clipboard through Get-Clipboard or the Forms Clipboard class, a collection technique used to steal copied passwords, tokens or wallet addresses. Clipboard capture is tracked in the Red Canary Threat Detection Report. Detecting these calls surfaces harvesting of sensitive copied data.

Renamed User Account Creation Disguised in a Computer Account (via security)

This rule detects creates a user account that fakes a computer account.

Suspicious Raspberry Robin Msiexec Spawning a Proxy Binary (via process_creation)

This rule detects msiexec.exe spawning rundll32, odbcconf or regsvr32, the post-install execution chain Raspberry Robin uses to hand off to a signed-binary proxy after a remote MSI install. This msiexec-to-LOLBIN chain is a defense-evasion technique tracked in the Red Canary Threat Detection Report. Detecting the parent-child pair surfaces loader activity following an MSI download.

Malicious Modification of a User Account SPN to Enable Kerberoast Attack (via security)

This rule detects update the Service Principal Name (SPN) of a user account in order to enable Kerberoast attack and crack its password.

Suspicious Secure Deletion of Free Space via Cipher (via process_creation)

This rule detects cipher.exe run with the /w wipe switch, which overwrites free disk space and is abused to destroy recoverable data or securely erase attacker artifacts. Data destruction via cipher is an impact and anti-forensic technique tracked in the Red Canary Threat Detection Report. Detecting this invocation surfaces deliberate data wiping.

Malicious Account Set with Kerberos DES Encryption Activated - Weakness Introduction (via security)

This rule detects set an account with DES Kerberos encryption to perform ticket brutforce.

Suspicious Browser Extension Sideload From a User Path (via process_creation)

This rule detects a Chromium-based browser launched with --load-extension pointing at an extension in AppData, Temp or ProgramData, the persistence behavior ChromeLoader uses to inject a malicious browser extension. Loading an unpacked extension from a user-writable path is a technique tracked in the Red Canary Threat Detection Report. Detecting this invocation surfaces browser hijacking for adware or credential theft.

Malicious LSASS Credential Dump with LSASSY - Process (via process_creation)

This rule detects remotely dump LSASS credentials using the LSASSY tool.

Malicious Account Set with Kerberos Pre-authentication Not Required - AS-REP Roasting (via security)

This rule detects set an account with Kerberos pre-authentication not required to perform offline brutforce. Account with this status can be checked with the following command > "Get-ADUser -Filter 'useraccountcontrol -band 4194304' -Properties useraccountcontrol".

Possible Logged-On Session Discovery via Quser or Qwinsta (via process_creation)

This rule detects quser or qwinsta enumerating interactive logon sessions, a system-owner and remote-session discovery step attackers use to find active administrators before lateral movement. Session discovery is tracked in the Red Canary Threat Detection Report. Detecting these queries surfaces reconnaissance of who is logged on.

Suspicious PSexec Service Installation (via security)

This rule detects installs PSexec service.

PowerShell Proxy Execution via SyncAppvPublishingServer (via process_creation)

This rule detects SyncAppvPublishingServer being used to smuggle a PowerShell command through its argument, a signed-binary proxy technique that runs script code while masking the parent as a trusted App-V component. SyncAppvPublishingServer abuse is a defense-evasion technique tracked in the Red Canary Threat Detection Report. Detecting this pattern surfaces script execution hidden behind a signed binary.

Suspicious DLL Execution via Odbcconf LOLBIN (via process_creation)

This rule detects odbcconf.exe registering or executing a DLL through its regsvr action or a response file, a signed-binary proxy technique used to run attacker code past application allowlisting. Odbcconf abuse has appeared in Raspberry Robin activity profiled in the Red Canary Threat Detection Report. Detecting these invocations surfaces trusted-binary DLL execution.