Ibrahim Saud
@tektrixIndiaCompletionist
2 followers18,458 downloads7,120 copies47 likes38,599 views
11,679 detections
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Detects potential tampering with Pluggable Authentication Modules (PAM) or configuration files on Linux systems. This includes the loading of non-standard shared libraries by authentication-related processes (sshd, sudo, login), modification of core PAM modules (e.g., pam_unix.so) by non-package manager processes, and unauthorized modifications to files within /etc/pam.d/. It also monitors for credential-related activity where authentication processes write data into temporary or hidden directories.
Detects Linux processes running from non-standard directories that exhibit network beaconing behavior, correlated with the concurrent creation or modification of systemd unit files on the same host. This pattern is indicative of a remote access trojan (RAT) or backdoor establishing persistent command-and-control.
Identifies CastleLoader's core execution behavior: python.exe or pythonw.exe executing compiled bytecode (.pyc) from heavily obfuscated or anomalous directories inside C:\ProgramData\ with an active network connection.
Correlates the RMM shell modifying the fDenyTSConnections registry key to force-enable Remote Desktop Protocol for interactive lateral movement.
Detects a suspicious file deletion event where a JSE script is deleted from the Downloads directory by wscript.exe or cscript.exe. This activity is indicative of the Kimsuky threat group's NUKESPED dropper cleaning up its own artifact after execution to avoid forensic detection.
Detects the Kimsuky threat group using a JSE-based loader to write decoded binary payloads to the C:\ProgramData directory. The files are written using randomized filenames with specific non-standard extensions (.a9oc, .lpXD, .lpxQ, .lpXO) initiated by wscript.exe or cscript.exe, a technique observed in their January 2026 campaign.
Detects execution activity associated with the Kimsuky NUKESPED loader, specifically identified by the script interpreter spawning processes or making network requests related to specific decoy URLs (NHIS health portal) or opening decoy PDF files from the user's Downloads directory.
Detects the execution of fltMC.exe originating from a temporary folder, which is indicative of potential malicious activity. The rule monitors for suspicious child processes spawned by this binary, outbound network connections, and file system operations (creation, modification, renaming) associated with this execution context.
Detects execution of common discovery binaries (tasklist, netstat, ipconfig, net, whoami, query) when spawned by the filter manager utility (fltMC.exe) or its children, a behavior observed in the Red Lamassu JFMBackdoor post-compromise activity.
Detects indicators associated with the JDY botnet targeting SOHO and IoT infrastructure. The rule monitors for suspicious firmware update attempts to non-vendor hosts, identifies high-rate outbound scanning from edge devices, and flags devices that show re-emergence of suspicious behavior after a quiet period.
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