Defense Evasion (TA0005)(external, opens in a new tab or window)
text code block:process where host.os.type == "windows" and event.code == "10" and length(winlog.event_data.CallTrace) > 0 and /* Sysmon CallTrace starting with unknown memory module instead of ntdll which host Windows NT Syscalls */ not winlog.event_data.CallTrace : ("?:\\WINDOWS\\SYSTEM32\\ntdll.dll*", "?:\\WINDOWS\\SysWOW64\\ntdll.dll*", "?:\\Windows\\System32\\wow64cpu.dll*", "?:\\WINDOWS\\System32\\wow64win.dll*", "?:\\Windows\\System32\\win32u.dll*") and not winlog.event_data.TargetImage : ("?:\\Program Files (x86)\\Malwarebytes Anti-Exploit\\mbae-svc.exe", "?:\\Program Files\\Cisco\\AMP\\*\\sfc.exe", "?:\\Program Files (x86)\\Microsoft\\EdgeWebView\\Application\\*\\msedgewebview2.exe", "?:\\Program Files\\Adobe\\Acrobat DC\\Acrobat\\*\\AcroCEF.exe") and not (process.executable : ("?:\\Program Files\\Adobe\\Acrobat DC\\Acrobat\\Acrobat.exe", "?:\\Program Files (x86)\\World of Warcraft\\_classic_\\WowClassic.exe") and not winlog.event_data.TargetImage : "?:\\WINDOWS\\system32\\lsass.exe")
Install detection rules in Elastic Security
Detect Suspicious Process Access via Direct System Call in the Elastic Security detection engine by installing this rule into your Elastic Stack.
To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).