Mehulkumar Savajani
@MsavajaniCompletionist
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97 detections
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Detects potential Command and Control (C2) communication from the AK47C2 backdoor over HTTP. The backdoor sends a hex-encoded JSON payload via HTTP POST requests. This rule specifically looks for HTTP POST requests with a request body longer than 100 characters that consists entirely of hexadecimal characters, indicative of the AK47C2 communication pattern.
This detection identifies Command and Control (C2) communication associated with the FormBook RAT, specifically targeting connections to a known malicious IP address and dynamic DNS domain on an unusual port. Detecting C2 activity is crucial for identifying active compromises and preventing data exfiltration or further malicious commands.
This search detects network connections to a specific webhook.site URL known to be used by the Shai-Hulud 2.0 worm for data exfiltration.
Detects a user account creation event in Azure AD followed by that same account being added to a privileged administrative role within a short timeframe (e.g., 40 minutes). This behavior is a key tactic of threat actors like Muddled Libra (Scattered Spider), who are known to rapidly escalate privileges after gaining initial access. This detection requires a SIEM to correlate the user identity between the creation event and the role addition event.
Detects Remote Procedure Call (RPC) attempts targeting critical assets, such as Domain Controllers, where the call includes a UNC path pointing to an external IP address. This is a strong indicator of an authentication coercion attack (e.g., PetitPotam, DFSCoerce) where an attacker is attempting to force the critical asset to authenticate to a listener they control to capture credentials.
Detects the FormBook RAT persistence mechanism where it copies itself to a disguised location (%APPDATA%\Roaming\word\word.exe) and creates a registry run key named 'svchost.exe' to ensure execution at user login. The rule correlates the file creation and registry modification events on the same device within a short time window.
Detects the presence of old versions of NetSupport Manager (client32.exe), a tool repurposed as a RAT by the Bloody Wolf threat actor. The actor is known to use versions from October 2013 or older. This rule specifically looks for 'client32.exe' with the file description 'NetSupport Client' and a FileVersion older than '12.0.0.0'.
Detects Remote Procedure Call (RPC) authentication coercion attempts where a machine is forced to authenticate to an external IP address. Attackers use this technique to capture credentials by tricking a server into connecting to a listener they control. This rule identifies known vulnerable RPC interfaces and functions (including rare ones like MS-EVEN/ElfrOpenBELW) being used with a UNC path parameter that points to a public IP address.
This rule detects web requests targeting SharePoint endpoints associated with the ToolShell exploit chain (CVE-2025-49704, CVE-2025-49706, CVE-2025-53770, CVE-2025-53771). This activity is linked to the threat actor CL-CRI-1040 (also known as Storm-2603). The rule specifically looks for requests to "/_layouts/15/ToolPane.aspx" or "/_layouts/15/SignOut.aspx" that also contain suspicious strings indicative of command execution or file manipulation attempts, such as "cmd.exe", "powershell", "whoami", "ipconfig", "systeminfo", "&cmd=", or "&file=".
Detects a defense evasion technique used by CHAMELEON#NET where the malware introduces significant delays using multiple 'ping 127.0.0.1 -n <number> > nul' commands chained together. This tactic is designed to bypass automated sandbox analysis by exceeding typical execution timeouts.
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