SigmaHQ Detections
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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.
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.
This rule detects the execution of the 'split' command, which is commonly used to break large files into smaller, more manageable pieces. Adversaries may use this technique to circumvent data transfer size limits during exfiltration or to prepare data for transfer through channels with size restrictions. The detection focuses on the command line execution of the 'split' utility.
This rule detects commands commonly used on Cisco network devices to collect configuration data, which may contain sensitive information such as credentials. The commands include 'show running-config' to display the current operational configuration, 'show startup-config' to display the configuration loaded at boot, and 'show archive config' which can show archived configurations. An adversary might use these commands to gather information about the network, discover credentials, or understand the device's security posture.
Detects Label Distribution Protocol (LDP) authentication failures on Cisco devices, which could indicate an adversary attempting to brute force LDP authentication to manipulate MPLS labels. This could be part of an effort to disrupt network traffic or gain unauthorized access.
Detects downloads of potentially malicious file types (executables, scripts, documents, archives) from domains that are not common Top-Level Domains (TLDs). This rule aims to identify suspicious file transfers that bypass typical, trusted sources.
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