SigmaHQ Detections
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This rule detects attempts to change file or folder permissions and ownership on Linux systems by monitoring the execution of the 'chmod' and 'chown' commands. These commands are commonly used by adversaries to modify access controls, potentially to evade defenses, gain access to protected files, or establish persistence.
This rule detects the loading of kernel modules using the 'insmod' command. Loadable Kernel Modules (LKMs) are code segments that can be dynamically loaded into and unloaded from the kernel. Adversaries may leverage LKMs for establishing persistence, elevating privileges, or deploying kernel-mode rootkits, as they operate with the highest system privileges (Ring 0). The detection specifically looks for the execution of 'kmod' with the 'insmod' command.
This rule detects the use of the 'import' command, part of ImageMagick, to capture screenshots on a Linux system. It specifically looks for executions of 'import' where the arguments indicate a full-screen capture (using '-window root') or a general screenshot saved to a common image file format (PNG, JPG, JPEG). This activity is often associated with adversaries attempting to collect visual information from a compromised system.
Detects the use of the 'xwd' utility to capture screenshots on a Linux system. This rule is particularly relevant for server environments where screenshot utilities are less commonly used by legitimate users, reducing false positives. The detection logic specifically looks for 'xwd' execution with parameters indicating a screen capture, such as '-root' or '-out' followed by a file ending in '.xwd'.
Detects suspicious DNS error messages that indicate a fatal or suspicious error that could be caused by exploiting attempts. Specifically looks for messages related to dropping source port zero packets, denied AXFR requests, and fatal errors causing an exit.
This rule detects the execution of the 'grep' command on Linux systems when it is used to search for specific filenames associated with the GobRAT malware. The filenames include 'apached', 'frpc', 'sshd.sh', and 'zone.arm'. This activity indicates that an attacker, potentially using GobRAT, is attempting to discover files related to their malware deployment or persistence mechanisms.
Detects the use of `iptables` or `ip6tables` commands to flush all firewall rules, tables, and chains, potentially allowing all network traffic. This action is often performed by adversaries to impair defenses and bypass network restrictions.
This rule detects the execution of a script via the SCX RunAsProvider ExecuteScript function, which is associated with the OMIGOD vulnerability. Specifically, it looks for process creation events where the user is 'root', the LogonId is '0', the CurrentDirectory is '/var/opt/microsoft/scx/tmp', and the CommandLine contains '/etc/opt/microsoft/scx/conf/tmpdir/scx'. This pattern indicates the execution of a temporary script created by the SCX agent, often exploited for privilege escalation or initial access.
Detects the use of 'arp -a' or 'ping' commands targeting common private and loopback IP address ranges on Linux systems, which can indicate an adversary performing remote system discovery.
Detects the use of `grep` or `egrep` commands on Linux systems to search for common security software process names. This activity can indicate an adversary attempting to discover installed security solutions on a compromised host.
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