Elastic medium stable eql
MsiExec Service Child Process With Network Connection
Identifies the execution of an MsiExec service child process followed by network or dns lookup activity. Adversaries may abuse Windows Installers for initial access and delivery of malware.
Detection Logic
sequence by process.entity_id with maxspan=1m
[process where host.os.type == "windows" and event.type : "start" and
process.parent.name : "msiexec.exe" and process.parent.args : "/v" and
not process.executable :
("?:\\Windows\\System32\\msiexec.exe",
"?:\\Windows\\sysWOW64\\msiexec.exe",
"?:\\Windows\\system32\\srtasks.exe",
"?:\\Windows\\syswow64\\srtasks.exe",
"?:\\Windows\\sys*\\taskkill.exe",
"?:\\Program Files\\*.exe",
"?:\\Program Files (x86)\\*.exe",
"?:\\Windows\\Installer\\MSI*.tmp",
"?:\\Windows\\Microsoft.NET\\Framework*\\RegSvcs.exe",
"C:\\Windows\\System32\\regsvr32.exe",
"C:\\Windows\\Sys?????\\certutil.exe",
"C:\\Windows\\System32\\WerFault.exe",
"C:\\Windows\\System32\\wevtutil.exe",
"C:\\Windows\\SysWOW64\\WindowsPowerShell\\v1.0\\powershell.exe") and
not (process.name : ("rundll32.exe", "regsvr32.exe", "powershell.exe", "regasm.exe", "wscript.exe") and process.args : ("?:\\Program Files\\*", "?:\\Program Files (x86)\\*")) and
not (?process.code_signature.subject_name : ("Bruno Software Inc", "Proton AG", "Axis Communications AB", "Citrix Systems, Inc.", "NSUS Limited", "Action1 Corporation", "Solarwinds Worldwide, LLC") and
?process.code_signature.trusted == true) and
not (?process.pe.original_file_name in ("dxsetup.exe", "MofCompiler.exe", "ShellApp.exe") and
?process.code_signature.subject_name : "Microsoft Corporation" and ?process.code_signature.trusted == true) and
not ?process.hash.sha256 in ("cfaef8c711db04d6c4a4381c66ac21b9e234e57febedb77fedc9316898b214bc",
"2f26f37cce780ca76f0dbac0de233f4c8d84c31b3f37380b9d5faacc3ee2d03e",
"7d9c691bfbf3beb78919dfd940fa6d325c3437425d5b0371df39aef6accf858d")
]
[network where host.os.type == "windows" and process.name != null and
not dns.question.name : ("core.bdec.microsoft.com", "go.microsoft.com", "ocsp.digicert.com", "localhost", "www.google-analytics.com",
"ocsp.verisign.com", "*.symcb.com")] Field Validations
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