ZACCESS/SIREFEF Arrives with New Infection Technique

During the last weeks of July, we received reports from customers that their services.exe files were being patched by an unknown malware. The patched services.exe, detected by Trend Micro as PTCH_ZACCESS (for 32-bit version) and PTCH64_ZACCESS (for 64-bit version), was verified to be a component of the SIREFEF/ZACCESS malware family. ZACCESS (also known as ZEROACCESS)…