SigmaHQ Detections
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This rule detects the presence of base64 encoded shebangs (e.g., #!/bin/bash) within command-line arguments. Adversaries often encode commands to evade detection and obfuscate their malicious intent. The rule specifically looks for the base64 representations of common shell shebangs, indicating that a script or command containing these might be decoded and executed.
Detects the execution of the 'crontab -l' command, which is used to list scheduled cron jobs for the current user. This activity can be part of discovery tactics by adversaries to understand the system's scheduled tasks.
Detects file deletion using "rm", "shred" or "unlink" commands which are used often by adversaries to delete files left behind by the actions of their intrusion activity.
Detects execution of the perl binary with the "-e" flag and common strings related to potential reverse shell activity. This rule looks for specific patterns in the command line arguments that indicate an attempt to establish a reverse shell using Perl's networking capabilities.
Detects the use of the 'chmod' command to modify file permissions in suspicious directory paths commonly used by malware for persistence or evasion. This rule specifically looks for chmod operations within '/tmp/', '/.Library/', '/etc/', and '/opt/' directories.
This rule detects the use of the 'find' command on Linux systems with specific permission-related arguments. These arguments are often used by attackers during the discovery phase to locate files with unusual permissions, such as SUID/SGID binaries (-perm -4000, -perm -2000, -perm -u=s, -perm -g=s) which can be exploited for privilege escalation, or world-writable files (-perm 0777, -perm -222, -perm -o w) which could be used for persistence or data modification. It also looks for world-executable files (-perm -o x).
Detects suspicious child processes spawned from an interactive bash shell. This rule looks for specific command-line patterns (e.g., base64 encoding, pty.spawn for pseudo-terminal allocation) or specific executables (e.g., whoami, iptables, ncat/netcat) that are uncommon to be direct children of an interactive bash session, indicating potential malicious activity like reverse shells or reconnaissance.
Detects the execution of common shell interpreters (bash, csh, dash, fish, ksh, sh, zsh) where the parent process is located within the '/tmp/' directory. This behavior is often indicative of malware, such as GobRAT, dropping and executing malicious components in temporary locations to evade detection.
Detects the execution of the 'execve_hijack' component of the Triple Cross eBPF rootkit. This specific file is used by the rootkit to elevate privileges by hijacking the 'execve' system call, often in conjunction with the 'sudo' command.
This rule detects the execution of specific commands associated with the installation of the Triple Cross eBPF rootkit. It looks for commands executed via 'sudo' that contain specific 'tc' (traffic control) parameters, including 'qdisc' and 'filter', along with a network interface like 'enp0s3'. These command line arguments are characteristic of the 'deployer.sh' script used by the Triple Cross rootkit to establish persistence and hide its presence using eBPF.
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