Darshan Thummar
@MightyCompletionist
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This rule detects attempts to query the list of system drivers on a remote Windows host via a WMI session over SMB (port 445). The detection is based on the presence of the string "Win32_SystemDriver" in the network traffic, indicating a WMI query for system driver information. This activity can be indicative of reconnaissance by an attacker.
This rule detects the delivery of a kernel driver enumeration tool via HTTP. Specifically, it looks for the string "EnumDeviceDrivers" (case-insensitive) within HTTP response data flowing to a client. This string is indicative of tools or malware attempting to enumerate loaded kernel drivers, which is a common reconnaissance technique used by attackers.
This rule detects HTTP requests that contain 'gcc' and '-o' in the URI, which could indicate an attempt to compile malware on a host using the GCC compiler. This activity is often associated with defense evasion techniques where an attacker compiles malicious code directly on a compromised system.
This rule detects attempts to install a kernel module (rootkit) on a Linux system via an SSH session. It specifically looks for the 'insmod' command followed by a '.ko' file extension within TCP traffic destined for port 22 (SSH). This combination suggests an attacker is trying to load a malicious kernel object.
This rule detects attempts to push a root certificate to a Windows system via the Remote Registry service (SMB port 445). It specifically looks for network traffic containing the strings "Root\Certificates" and "RegSetValue" (case-insensitive) within the same TCP flow to a server on port 445. This activity could indicate an attacker attempting to establish persistence or bypass security controls by installing a trusted root certificate.
This rule detects network traffic on TCP port 445 (SMB) containing the string "wintrust.dll" in a case-insensitive manner. This specific DLL is associated with Windows Trust Provider functionality. The detection is flagged as 'trojan-activity' and is linked to MITRE ATT&CK technique T1553.003 (Code Signing: Code Signing Policy Modification) and tactic Defense Evasion, suggesting an attempt to bypass code signing policies by replacing or manipulating the wintrust.dll.
This rule detects potential steganography where a payload is embedded within an image file, specifically a JPEG. It triggers when an HTTP response contains JPEG magic bytes (`FF D8 FF`) within the first 3 bytes, and the file size is unusually large (over 1MB), suggesting additional data might be hidden within the image. The rule also includes a threshold to prevent excessive alerts from legitimate large images.
This rule detects the delivery of a payload designed to bypass trust controls via HTTP. It specifically looks for HTTP responses (flow:to_client) containing the 'MZ' magic bytes (indicating an executable file) within the first 2 bytes of the file data, combined with URI paths that include keywords like 'bypass', 'unsigned', or 'notrust'. This combination suggests an attempt to deliver malicious or untrusted executables that aim to circumvent security mechanisms.
This rule detects the string "DisableAntiSpyware" in HTTP response bodies. This string is often associated with commands or responses related to disabling security defenses, specifically anti-spyware features, which is a common tactic used by malware or attackers for defense evasion. The rule is designed to alert when such a command or response is delivered to a client within an established HTTP flow.
This Suricata rule detects network traffic on TCP port 445 (SMB) that contains the strings "SpecialAccounts" and "UserList" (case-insensitive). This pattern is indicative of an attempt to hide a user account on a Windows system by modifying the registry's SpecialAccounts\UserList key. This technique is often used by adversaries for defense evasion.
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