Darshan Thummar
@MightyCompletionist
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This rule detects the remote installation of a new Windows service over SMB (Server Message Block) protocol. It specifically looks for TCP traffic on port 445 (SMB) directed to the home network, containing the strings "CreateService" and "svcctl" (case-insensitive). This combination indicates an attempt to create a new service remotely, which can be a method for persistence or privilege escalation by attackers.
This rule detects network traffic on TCP port 445 (SMB) containing the string 'lsasrv.dll' in a case-insensitive manner, indicating a potential attempt to modify the Domain Controller's authentication package. This activity is often associated with persistence techniques where an attacker modifies or replaces legitimate authentication packages to maintain access or elevate privileges.
This rule detects network traffic that indicates a shortcut (.lnk) file is being modified or created in a 'Startup' directory, which is a common technique for establishing autostart persistence on Windows systems. The rule specifically looks for TCP traffic on port 445 (SMB) containing the strings 'Startup' and '.lnk' (case-insensitive).
This rule detects the delivery of potentially malicious kernel modules or extensions over HTTP. It specifically looks for HTTP responses containing files with '.ko' (Linux kernel object) or '.kext' (macOS kernel extension) file extensions in the URI, indicating a client is downloading such a file. The 'flow:to_client,established' ensures the detection occurs on files being sent from a server to a client over an established HTTP connection.
This rule detects attempts to hijack the PATH environment variable during an SSH session. It specifically looks for the string "export PATH=" within TCP traffic on port 22 (SSH), indicating a potential malicious modification of the PATH environment variable to control command execution paths.
This rule detects attempts to hijack the dynamic linker's LD_PRELOAD mechanism over an SSH connection. It specifically looks for the string "LD_PRELOAD" within TCP traffic on port 22 (SSH). This technique is often used by attackers for persistence or privilege escalation by injecting malicious libraries into legitimate processes.
This rule detects the HTTP download of common boot script file types (batch, command, shell, PowerShell) that contain the string 'HKLM' (HKEY_LOCAL_MACHINE). This combination suggests an attempt to establish persistence or execute malicious code by modifying system-wide registry settings, often associated with trojan activity. The detection is based on the file extension in the URI and the content within the downloaded file's data.
This rule detects network traffic on port 445 (SMB) containing the strings "services.exe" and "ImagePath" (case-insensitive). This combination suggests an attempt to hijack the execution flow of a service by replacing its binary, specifically targeting the 'services.exe' process, which is a critical Windows component. The rule is designed to identify trojan activity related to persistence mechanisms.
This rule detects attempts to modify the shared library configuration file '/etc/ld.so' over an SSH connection. This activity is indicative of a shared library hijacking technique, often used for persistence or privilege escalation, where an attacker modifies the system's library loading paths to inject malicious libraries. The detection specifically looks for the string "/etc/ld.so" within TCP traffic destined for port 22 (SSH) on the home network.
This rule detects when an executable file (.exe) is dropped into a Windows 'Start Menu\Programs\Startup' folder via Server Message Block (SMB). This is a common technique used by attackers to establish persistence on a compromised system, ensuring that their malicious code runs every time the user logs in or the system starts.
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