
Ibrahim Saud
@tektrixIndiaCompletionist
2 followers18,458 downloads7,120 copies47 likes38,574 views
11,679 detections
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This rule identifies web requests containing path traversal sequences (such as '..', '..%2f', or null bytes) or attempts to access sensitive system files (e.g., 'etc/passwd', 'proc/self/environ') within URL query parameters. The rule normalizes different URL query fields and applies regex matching to detect common encoding bypass techniques used to exploit web applications.
Detects unauthorized file write or rename operations targeting core OpenSSH binary and library paths, excluding known package manager activities. This behavior is indicative of an adversary replacing legitimate system binaries to create a trojanized version of OpenSSH, as observed in the Velvet Ant 'Operation Highland' campaign, used to harvest credentials and log SSH sessions.
Detects an attacker-controlled SOCKS5 proxy masquerading as the Samba daemon (smbd) by renaming the process to 'smbd' and executing it with the '-D' flag from non-standard filesystem locations such as /tmp, /home, /var/tmp, or /dev/shm. This behavior is associated with the Velvet Ant threat group, which uses this technique to maintain persistent command-and-control communication while evading detection by blending in with legitimate system processes.
Detects the SearchLeak (CVE-2026-42824) delivery vector where a phishing link containing a long encoded 'q' parameter targeting Microsoft 365 Copilot Search is delivered via email to trigger prompt injection and subsequent data exfiltration of sensitive information.
Detects spearphishing attempts using SearchLeak (CVE-2026-42824) which involves delivering malicious Microsoft 365 Copilot Enterprise search URLs. These URLs utilize prompt injection via the query parameter to target high-value users, aiming to exfiltrate sensitive data such as MFA codes, email contents, or meeting details through the Copilot interface.
This rule detects instances where the Windows Explorer process (explorer.exe) launches a command prompt (cmd.exe). While legitimate use may occur in certain scenarios, this pattern is often associated with malicious actors attempting to gain interactive shell access or execute commands via user-initiated actions or secondary exploitation vectors.
This rule detects persistence mechanisms associated with the SystemBC/Coroxy malware. It monitors for three indicators: 1) The creation of scheduled tasks via 'schtasks.exe' where the task binary is located in 'ProgramData' and uses the 'start' argument; 2) Windows Security Event ID 4698 (Scheduled Task Created) identifying similar task actions in 'ProgramData' with the 'start' argument; 3) The creation of Registry Run keys in 'HKCU' or 'HKLM' with values containing 'ProgramData' combined with malicious arguments such as 'start', '-windowstyle hidden', or '-ep bypass'.
Detects the creation of unsigned executable files (.exe or .dll) larger than 50MB on an endpoint. This activity is often associated with the staging of large, unsigned, or potentially malicious binaries, which may indicate the deployment of tools for further malicious activity or masquerading.
This rule detects the loading of DLL modules from non-standard system directories (outside of Windows, System32, SysWOW64, or Program Files) by signed processes, or the loading of files with known suspicious filenames such as 'MiniJunk' or 'TRUSTRAP'. This behavior is indicative of potential DLL sideloading, search order hijacking, or the loading of malicious payloads masquerading as legitimate libraries.
Detects execution of OfficeUpdater VBScript via wscript.exe or cscript.exe with specific command line arguments, or the creation of corresponding .ini configuration files. This pattern is indicative of potential malicious activity or persistence mechanisms mimicking legitimate update processes.
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