TA4922 DLL Sideloading: Signed Binary Loading Unsigned DLL from Writable Path

Ibrahim Saud@tektrix

•updated Jun 30, 2026•0•0•2

Detects instances where a digitally signed executable loads a DLL file from a user-writable directory (e.g., AppData, Downloads, Temp). This is a common technique used by threat actors, such as in TA4922 campaigns, to execute malicious payloads (e.g., Atlas RAT or ValleyRAT) by sideloading them into a trusted process, effectively bypassing application allow-listing and environment security controls.