SigmaHQ Detections
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Detects attempts to exfiltrate data by posting a file using the `wget` utility. This can be particularly dangerous if an adversary leverages misconfigured sudo permissions for `wget` to read sensitive files like `/etc/shadow` and then exfiltrate them.
This rule detects attempts to extract passwords from files on Linux systems using the 'grep' command. It specifically looks for executions of 'grep' in conjunction with the keyword 'password', indicating a potential search for credentials.
This rule detects suspicious command-line executions that attempt to create symbolic links to the `/etc/passwd` file. Attackers might do this to gain unauthorized access to user account information, potentially leading to credential dumping or privilege escalation. The rule specifically looks for `ln -s /etc/passwd` and `ln -s -f /etc/passwd` patterns in command lines.
This rule detects attempts to copy the 'passwd' or 'shadow' files from the '/tmp/' directory using the 'cp' command. This activity is highly suspicious as these files contain sensitive user account information, including password hashes (in the case of 'shadow'), and should not typically be copied to temporary directories. An adversary might do this to exfiltrate credentials for offline cracking or to move them to a location accessible for further exploitation.
Detects the installation of new root certificates on a Linux system. Attackers may install root certificates to bypass security warnings when connecting to adversary-controlled web servers or C2 infrastructure, making their malicious traffic appear legitimate. This rule specifically looks for the execution of common Linux utilities used for managing CA certificates: 'update-ca-certificates' and 'update-ca-trust'.
This rule detects command-line operations that interact with common shell history files on macOS systems. Adversaries often target these files (e.g., .bash_history, .zsh_history) to extract sensitive information such as credentials or commands executed by users, which can aid in further compromise or understanding the environment.
Detects the execution of 'osacompile' by potentially suspicious parent processes such as 'applet' or 'osascript'. This activity can indicate an attempt to compile AppleScript or JavaScript for Automation (JXA) code, which adversaries might use for execution or obfuscation.
This rule detects attempts to disable logging on Cisco devices by looking for specific commands such as 'no logging' or 'no aaa new-model'. Adversaries may disable logging to evade detection and hinder forensic analysis.
This rule detects attempts to shut down a Cisco device or change its boot mode by looking for specific keywords in Cisco AAA logs. The keywords 'shutdown', 'config-register 0x2100', and 'config-register 0x2142' indicate actions that can lead to a denial of service or a change in the device's operational state.
This rule detects HTTP requests containing user-agent strings commonly associated with known scanning and reconnaissance tools such as Wfuzz, WPScan, and Recon-ng. These tools are often used by attackers to gather information about web applications and infrastructure before launching an attack.
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