Suspicious Extexport DLL Side-Loading Execution

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1574.001DLL
Persistence
- T1574.001DLL
Priv Esc
- T1574.001DLL
Defense Evasion
- T1218System Binary Proxy Execution
- T1574.001DLL
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects execution of the Internet Explorer Extexport.exe utility which loads mozcrt19, mozsqlite3 or sqlite3 DLLs from its working directory. In the WithSecure Code Execution and Persistence Lab 1 the Astaroth chain drops malicious DLLs of these names next to Extexport.exe to achieve DLL side-loading. Attackers proxy code execution through this signed LOLBin to run their payload under a trusted process.

Reporting behind it

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Suspicious Extexport DLL Side-Loading Execution

Pivot detection · T1574.001 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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