>timeout
Timeout runs a command with a time limit. SUID timeout launches child programs with preserved elevated permissions.
Default Executable Paths
/usr/bin/timeoutIntegrity & Metadata
Executing timeout 7d /bin/sh -p launches a long-lived root shell.
Alert on timeout invoking shells with -p (preserve privilege) switches.
Executive Summary & AI Quick Reference
timeout is a native utility pre-installed on Linux systems. Threat actors and red teams abuse timeout as a Living-off-the-Land Binary (LOLBin) to achieve Execute without triggering traditional antivirus file-hash alerts. Legitimate system administrators use it for routine administration, making behavioral command-line telemetry essential for differentiation.
Weaponized Parameters & Proof-of-Concepts
Documented attack commands, parameter flags, and privilege prerequisites.
Launches an interactive root shell under the timeout execution wrapper.
timeout 7d /bin/sh -pSIEM & EDR Detection Rules
Production telemetry rules configured for Microsoft Defender, Sigma, and Splunk.
Telemetry & SIEM Detection Suite (timeout)
Validated against MITRE T1059.004, T1548.0011DeviceProcessEvents | where FileName =~ "timeout" | where ProcessCommandLine has_any ("/bin/sh", "/bin/bash", "sh", "bash") | project Timestamp, DeviceName, AccountName, ProcessCommandLineMitigation, Hardening & Prevention
Recommended defensive controls to block or constrain timeout abuse.
Audit and remove unnecessary SUID / SGID bits (`chmod u-s /path/to/$timeout`) and restrict sudoers NOPASSWD execution grants.
Implement AppArmor or SELinux profiles restricting timeout network socket creation and read access to sensitive user directories.
Deploy the KQL, Sigma, and Splunk detection queries below. Alert on anomalous child processes, web requests to unrated external IPs, or encoded payload strings.
Frequently Asked Questions (FAQ) • timeout
Key operational questions and defensive answers about timeout LOLBin tradecraft.
What is timeout and why is it classified as a LOLBin?
timeout is a legitimate, pre-installed or trusted utility on Linux. It is classified as a Living-off-the-Land Binary (LOLBin) because adversaries abuse its built-in functionality to perform malicious operations—such as Execute—without dropping custom malware binaries on disk.
How do threat actors abuse timeout in cyber intrusions?
Adversaries leverage timeout to execute stealthy actions while evading signature-based security controls. For example, attackers execute commands like "timeout 7d /bin/sh -p" to achieve Execute, masquerading behind legitimate system process lineage.
How can SOC analysts detect suspicious timeout activity?
Detection engineers monitor process creation events (Windows Event ID 4688 or Sysmon Event ID 1; Linux auditd EXECVE; macOS Endpoint Security) inspecting anomalous command line arguments, unusual parent-child process relationships (e.g. Office apps or web servers spawning timeout), and unexpected network connections.
What MITRE ATT&CK techniques does timeout map to?
timeout maps to MITRE ATT&CK technique(s): T1059.004, T1548.001. These techniques cover adversary actions across tactics such as Defense Evasion, Execution, Persistence, and Command and Control.
How can organizations mitigate and restrict timeout?
Mitigation strategies include implementing Application Control policies (AppLocker or Windows Defender Application Control - WDAC), enforcing Attack Surface Reduction (ASR) rules, configuring strict privilege separation (disallowing standard users from running sensitive switches), and alerting on execution from non-standard directories.
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