Hijack Execution Flow

What is Hijack Execution Flow?

“Hijack Execution Flow is documented as technique T1574 in MITRE ATT&CK® v19.1 under the Persistence tactic. Detection requires visibility into XDR, SIEM telemetry.”

Detection Strategies

The following detection strategies help SOC analysts identify Hijack Execution Flow activity. These methods apply across XDR, SIEM environments and can be implemented as detection rules, correlation queries, or behavioral analytics in your security platform.

1. 1

   Monitor for DLL file creation in directories that are earlier in the search path than the legitimate DLL location, particularly in application directories, current working directories, or Windows PATH directories for missing DLLs.

2. 2

   Alert on processes loading DLLs from unexpected paths, comparing loaded module paths against known good baselines for that application, with particular attention to security-sensitive applications that may grant elevated permissions to loaded modules.

3. 3

   Detect DLL side-loading by monitoring for known vulnerable applications loading unsigned or unexpected DLLs from the same directory as the application executable, which is the characteristic pattern of DLL side-loading attacks.

4. 4

   Monitor PATH environment variable modifications that add user-writable directories before system directories, which could allow attackers to substitute malicious versions of system utilities called without full paths.

5. 5

   Implement application whitelisting to restrict which DLL files can be loaded by specific processes, preventing hijacking attempts from succeeding even when malicious DLLs are successfully placed in searched locations.

Example Alerts

These realistic alert examples show what Hijack Execution Flow looks like in your security tools. Use them to tune detection rules and train analysts to recognize true positives versus false positives in live environments.

Frequently Asked Questions

How do SOC analysts detect Hijack Execution Flow?

Detection centers on XDR, SIEM telemetry for the persistence phase of the attack. Monitor for DLL file creation in directories that are earlier in the search path than the legitimate DLL location, particularly in application directories, current working directories, or Windows PATH directories for missing DLLs. Alert on processes loading DLLs from unexpected paths, comparing loaded module paths against known good baselines for that application, with particular attention to security-sensitive applications that may grant elevated permissions to loaded modules.

What does a Hijack Execution Flow alert look like?

A representative XDR detection is "DLL Side-Loading via Legitimate Signed Application" (high severity): Legitimate signed application VulnerableApp.exe loaded version.dll from its own application directory rather than System32. The loaded version.dll is not the legitimate Windows version library; its hash matches a known Cobalt Strike loader. The malicious DLL was placed alongside the signed application, which loads it without path validation. Execution through a trusted signed process evades many security controls that check parent process reputation.

Which tools detect Hijack Execution Flow, and how can I practice?

Hijack Execution Flow (T1574) is best surfaced with XDR, SIEM telemetry, which exposes the persistence signals described above. Practice detecting it on those exact consoles in SOCSimulator Operations, free.