>dd
Dd converts and copies raw files and disks. Attackers abuse SUID dd to read raw partitions, memory dumps, or extract protected shadow files.
Default Executable Paths
/bin/dd/usr/bin/ddIntegrity & Metadata
Dd can read block devices (/dev/sda1) directly, bypassing standard filesystem permissions.
Look for dd commands with if=/etc/shadow or if=/dev/ disk devices.
Executive Summary & AI Quick Reference
dd is a native utility pre-installed on Linux systems. Threat actors and red teams abuse dd as a Living-off-the-Land Binary (LOLBin) to achieve Credential Dump 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.
Copies the protected shadow file to a world-readable temporary location.
dd if=/etc/shadow of=/tmp/shadow.bakSIEM & EDR Detection Rules
Production telemetry rules configured for Microsoft Defender, Sigma, and Splunk.
Telemetry & SIEM Detection Suite (dd)
Validated against MITRE T10051DeviceProcessEvents | where FileName =~ "dd" | where ProcessCommandLine has_any ("if=/etc/shadow", "if=/dev/mem", "if=/etc/sudoers") | project Timestamp, DeviceName, AccountName, ProcessCommandLineMitigation, Hardening & Prevention
Recommended defensive controls to block or constrain dd abuse.
Audit and remove unnecessary SUID / SGID bits (`chmod u-s /path/to/$dd`) and restrict sudoers NOPASSWD execution grants.
Implement AppArmor or SELinux profiles restricting dd 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) • dd
Key operational questions and defensive answers about dd LOLBin tradecraft.
What is dd and why is it classified as a LOLBin?
dd 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 Credential Dump—without dropping custom malware binaries on disk.
How do threat actors abuse dd in cyber intrusions?
Adversaries leverage dd to execute stealthy actions while evading signature-based security controls. For example, attackers execute commands like "dd if=/etc/shadow of=/tmp/shadow.bak" to achieve Credential Dump, masquerading behind legitimate system process lineage.
How can SOC analysts detect suspicious dd 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 dd), and unexpected network connections.
What MITRE ATT&CK techniques does dd map to?
dd maps to MITRE ATT&CK technique(s): T1005. These techniques cover adversary actions across tactics such as Defense Evasion, Execution, Persistence, and Command and Control.
How can organizations mitigate and restrict dd?
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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