Unsigned 'UpdateAssistant'/'AppUpdateHelper' masquerading as Microsoft process

Ibrahim Saud@tektrix

•updated Sep 22, 2026•0•0•1

Detects the execution of processes named 'UpdateAssistant.exe', 'AppUpdateHelper.exe', or 'SysMaintenance.exe' from specific common application directories that are either unsigned or lack a valid Microsoft digital signature. This pattern is commonly used by adversaries to masquerade malicious binaries as legitimate system update components to evade detection.