Windows Binaries Write Suspicious Extensions
This rule detects when specific Windows executables (csrss.exe, lsass.exe, RuntimeBroker.exe, sihost.exe, smss.exe, wininit.exe, winlogon.exe, dllhost.exe, rundll32.exe, svchost.exe) write files with suspicious extensions such as .bat, .dll, .exe, .hta, .iso, .ps1, .txt, .vbe, and .vbs. This behavior can indicate defense evasion or other malicious activity where legitimate system processes are abused to drop or create malicious files.
Sigma
