DLL-Based Persistence — Active Compromise / High-Spread Response
When a DLL persistence signal is combined with an active compromise, suspicious process behavior, wide lateral spread, or a compromised administrator credential, executes comprehensive forensic analysis, hard isolation, full persistence removal, and host recovery steps.
Prepare
4 steps- Forensic capacity verification
Periodically verify that tools capable of capturing memory and disk images (EDR, dedicated DFIR toolset) are ready and accessible, and that Sysmon EID 1/7/10/12/13/14 events are being collected
- DLL persistence baseline
Confirm that the AppInit_DLLs, AppCertDlls, Netsh, shim, and COM HKCU override baseline is current and that periodic scanning with Autoruns or OSQuery is in place
- Destructive action approval chain
Host rebuild and broad network isolation affect production; document that these actions require L2/IR lead + system/application owner approval and that a separate decision gate is needed for each action
- Escalation chain
Document the SOC L1 → L2/IR analyst → EDR/endpoint manager → system/application owner → CISO chain; destructive actions cannot be initiated by L1 alone
Detect & Analyze
3 steps- Confirm compromise class
Confirm the correlation of active DLL loading (EID 7) with suspicious process behavior (network connection, command execution, lateral movement); document lateral movement signals (SMB, WMI, RDP), the privilege escalation chain if administrator credentials are compromised (initial access → priv esc → DLL persistence), and the simultaneous presence of multiple mechanisms (AppInit + shim + side-loading + COM)