SigmaHQ Detections
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Detects the execution of Ruby with the '-e' flag, which allows for inline script execution, combined with specific keywords related to socket programming ('rsocket', 'TCPSocket') and common shell names ('ash', 'bash', 'bsh', 'csh', 'ksh', 'pdksh', 'sh', 'tcsh'). This combination is a strong indicator of an attempt to establish a Ruby-based reverse shell.
Detects when a Java process spawns suspicious child processes, specifically various shell interpreters (sh, bash, dash, ksh, zsh, csh, fish), or common command-line tools like curl, wget, and python. This behavior can indicate a Java application being exploited to execute arbitrary commands on the system.
This rule detects the use of the `wget` command-line utility to download files into potentially suspicious directories, specifically `/tmp/`. Adversaries often use `wget` for ingress tool transfer, downloading malicious payloads or additional tools to a compromised system. The rule looks for `wget` execution combined with the `-O` or `--output-document` flags, which specify an output file, and the presence of `/tmp/` in the command line, indicating a download to a common temporary directory often abused by attackers.
Detects the usage of the `base64` utility on macOS to decode arbitrary base64-encoded text. This activity can be indicative of an adversary deobfuscating malicious content, such as scripts or payloads, that were previously encoded to evade detection.
Detects possible malicious execution of JavaScript for Automation (JXA) in-memory via the `osascript` utility on macOS. This rule specifically looks for command-line executions of `osascript` that include the `-e` flag (for executing a script string), the `eval` function, `NSData.dataWithContentsOfURL` (indicating potential remote content loading), and either explicitly specifies 'JavaScript' as the language or includes '.js' in the command line.
This rule identifies execution traces indicative of the XCSSET macOS malware. XCSSET is known to spread via Xcode projects and maliciously modify applications. The rule looks for specific command-line patterns involving 'curl' to suspicious URLs, 'osacompile' and 'plutil' interacting with user and group containers, and 'zip' archiving data from user and group containers. These activities suggest potential command and control communication, persistence mechanisms, and data staging/exfiltration by the malware.
This rule detects attempts to clear logging or archive history on Cisco network devices. Adversaries may clear command history or logging to remove forensic evidence of their activities, which is a common defense evasion technique.
This rule detects various keywords associated with data transfer and staging activities on Cisco devices. These activities could indicate an adversary attempting to move data onto the device for further exfiltration or to move data off the device. The keywords include common protocols and commands like 'tftp', 'rcp', 'puts', 'copy', 'configure replace', and 'archive tar', which are often used for file transfers and configuration management on network devices.
Detects the presence of default Cobalt Strike certificate in the HTTPS traffic
This rule detects a 'Segmentation Fault' error message in Apache error logs, indicating a crashing Apache worker process. This type of event can be caused by software vulnerabilities, misconfigurations, or malicious activity aiming to disrupt service availability.
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