Elastic Defend high stable eql
Potential Evasion via dotNET Framework Installation Utility
The Installer tool is a command-line utility that allows you to install and uninstall server resources by executing the installer components in specified assemblies. Adversaries may abuse this utility to run malicious code.
Detection Logic
process where event.action == "start" and
(
((process.name : "installutil.exe" or process.pe.original_file_name == "InstallUtil.exe") and process.command_line : ("*/LogFile*", "*http*")) or
descendant of [process where event.action == "start" and
(process.name : "installutil.exe" or process.pe.original_file_name == "InstallUtil.exe") and process.command_line : "*/LogFile*"]
) and
not (process.executable : "?:\\Windows\\System32\\conhost.exe" and process.args : "0xffffffff" and process.args : "-ForceV1") and
not (process.name : "installutil.exe" and
process.args : ("?:\\Program Files\\*", "?:\\Program Files (x86)\\*", "PFU.PaperStream.Capture.FiScannerEventService.exe", "PFU.PaperStream.Capture.ReleaseService.exe")) and
not (process.parent.name : "installutil.exe" and process.parent.args : ("?:\\Program Files\\*", "?:\\Program Files (x86)\\*")) and
not process.executable :
("?:\\Program Files\\*exe",
"?:\\Program Files (x86)\\*.exe",
"?:\\Windows\\System32\\wbem\\mofcomp.exe",
"?:\\Windows\\SysWOW64\\wbem\\mofcomp.exe",
"?:\\Windows\\system32\\conhost.exe",
"?:\\Windows\\SysWOW64\\conhost.exe",
"?:\\Windows\\Sys*\\net.exe",
"?:\\Windows\\Sys*\\net1.exe",
"?:\\Windows\\System32\\wbem\\mofcomp.exe") and
not process.parent.executable :
("?:\\Program Files*\\SolarWinds\\Orion\\ConfigurationWizard.exe",
"?:\\Program Files*\\Rescue and Smart Assistant\\InstallUtil64.exe",
"?:\\Program Files*\\Rescue and Smart Assistant\\*.exe",
"?:\\Windows\\System32\\msiexec.exe") and
not (process.executable : "?:\\Windows\\System32\\sc.exe" and process.args : "delete") and
not (process.args : "/LogFile=C:\\ProgramData\\Veeam\\Setup\\Temp\\Veeam.Backup.PowerShell.InstallLog" and process.parent.name : "msiexec.exe") and
not (process.name : "InstallUtil.exe" and process.args : ("C:\\Estensa\\Bin64Client\\SL.Server.Cache.WindowsService.exe", "\\SolarWinds TFTP Server.exe")) Field Validations
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