EndClient RAT Targets NGOs via Signed MSI Installer
EndClient RAT arrives as a signed MSI named “StressClear.msi,” which abuses code-signing trust and SmartScreen gaps. The package decoys with a VeraPort component while an obfuscated AutoIt loader executes in memory, establishes the IoKlTr task, and opens a JSON-over-TCP C2. To reduce risk, restrict MSI installs, enforce SmartScreen blocking, instrument MSI→AutoIt lineage, and remove scheduled tasks used for persistence.