Elastic Defend high stable eql
Office Application Startup via Template File Modification
Adversaries can modify default Microsoft Office templates in order to establish persistence using malicious Macro templates.
Detection Logic
file where event.action in ("creation", "overwrite") and process.pid != 4 and
process.name != null and user.name != null and
file.path :
("C:\\Users\\*\\AppData\\Roaming\\Microsoft\\Templates\\Normal.dotm",
"C:\\Users\\*\\AppData\\Roaming\\Microsoft\\Excel\\XLSTART\\PERSONAL.XLSB") and file.size > 0 and
not process.thread.Ext.call_stack_summary in
("sysfer.dll
| apphelp.dll
| kernelbase.dll
| migcore.dll
| loadstate.exe
| kernel32.dll
| ntdll.dll",
"ntdll.dll
| apphelp.dll
| kernelbase.dll
| migcore.dll
| loadstate.exe
| kernel32.dll
| ntdll.dll") and
not process.executable : ("?:\\Windows\\System32\\svchost.exe",
"?:\\Windows\\explorer.exe",
"?:\\Program Files\\Citrix\\User Profile Manager\\UserProfileManager.exe",
"?:\\Program Files (x86)\\Citrix\\User Profile Manager\\UserProfileManager.exe",
"?:\\Program Files (x86)\\Ivanti\\Workspace Control\\pfwsmgr.exe",
"?:\\ProgramData\\ForensiT\\Transwiz\\Deployment Files\\Transwiz.exe",
"C:\\Program Files (x86)\\Windows Kits\\10\\Assessment and Deployment Kit\\User State Migration Tool\\amd64\\loadstate.exe",
"?:\\Windows\\Sys*\\xcopy.exe",
"?:\\Windows\\Sys*\\Robocopy.exe",
"?:\\Program Files\\Veeam\\Endpoint Backup\\*.exe",
"?:\\Program Files (x86)\\Laplink PCmover\\PCmoverHost.exe",
"?:\\Windows\\System32\\dllhost.exe",
"C:\\Windows\\System32\\cmd.exe",
"D:\\SuperGrate*.exe",
"\\Device\\Mup\\*.exe") and
not user.id in ("S-1-5-18", "S-1-5-19", "S-1-5-20") Field Validations
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