Ibrahim Saud
@tektrixIndiaCompletionist
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11,679 detections
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Detects the creation or modification of files within /etc/systemd/system/ or /etc/init.d/ by non-standard management processes. Attackers often use these paths to establish persistence by creating or altering service unit files to execute malicious code automatically upon system boot or service restart. The rule specifically excludes common system management tools.
Detects instances where a Perl interpreter attempts to mask itself as a Samba (smbd) service process, or where smbd/perl processes initiate network connections on port 5000, and identifies smbd processes spawned by non-standard parent processes like sh, bash, or perl, which is indicative of potential unauthorized service manipulation or backdoor activity.
Detects the execution of GSocket (gs-netcat), a network tool often used for establishing persistent backdoors, interactive shells, or SOCKS proxies. The rule identifies execution with common flags for daemonization, interactive shell access, or SOCKS proxying, as well as instances where the process masquerades as common system binaries (e.g., smbd, sshd) or is initiated from system persistence directories like systemd or init.d.
Detects instances where the sshd process or PAM-related processes create or write to files within temporary directories (/tmp/ or /var/). This behavior is often associated with the staging of malicious scripts, backdoors, or tools during an attack involving credential abuse or unauthorized access via SSH.
Detects instances where the DllHost.exe process creates or writes files with common executable or script extensions (.exe, .dll, .ps1, .bat, .cmd, .vbs, .hta, .scr, .sh) into suspicious, publicly writable, or temporary directories. This behavior is indicative of potential malicious payload staging, masquerading, or post-exploitation activity.
This rule detects two suspicious behaviors associated with OpenSSH components: the direct modification or replacement of critical OpenSSH binaries (/usr/sbin/sshd, /usr/bin/ssh, /usr/bin/scp), or the use of these processes to write files to suspicious or non-standard locations (such as /tmp/ or unauthorized subdirectories within /var/log/), which may indicate credential harvesting or the presence of a backdoor.
Detects instances where the DllHost.exe process creates files with executable-like extensions (exe, dll, ps1, bat, cmd, vbs, hta, scr) within high-risk, world-writable directories such as C:\Users\Public, C:\Windows\Temp, C:\ProgramData, C:\Users\Default, or AppData\Local\Temp. This behavior is often indicative of malicious activity, such as file drops for further execution or persistence, as legitimate COM surrogate activity rarely results in file creation in these specific locations.
Detects path traversal attempts within HTTP request parameters, specifically identifying encoded traversal sequences, file protocol usage, and attempts to access sensitive system files like /etc/passwd or /proc/self/environ.
Detects the initialization and execution of processes within the Windows Subsystem for Linux (WSL) environment, specifically tracking the start of WSL processes or the invocation of WSL-related binaries like wsl.exe and vmmem. This allows security teams to monitor interop operations between the host Windows OS and the Linux subsystem.
Detects the use of a masquerading binary named 'uptime' for persistence or malicious activity on Linux systems. This rule monitors for unauthorized 'uptime' process activity such as network connections, spawning of shell/interpreter processes, creation of systemd service unit files, and manipulation via systemctl, as well as execution from non-standard directories.
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