Elastic low stable eql
Compression DLL Loaded by Unusual Process
Identifies the image load of a compression DLL. Adversaries will often compress and encrypt data in preparation for exfiltration.
Detection Logic
library where host.os.type == "windows" and event.action == "load" and
dll.name : ("System.IO.Compression.FileSystem.ni.dll", "System.IO.Compression.ni.dll") and
not
(
(
process.executable : (
"?:\\Program Files\\*",
"?:\\Program Files (x86)\\*",
"?:\\Windows\\Microsoft.NET\\Framework*\\mscorsvw.exe",
"?:\\Windows\\System32\\sdiagnhost.exe",
"?:\\Windows\\System32\\inetsrv\\w3wp.exe",
"?:\\Windows\\SysWOW64\\inetsrv\\w3wp.exe",
"?:\\ProgramData\\Microsoft\\Windows Defender Advanced Threat Protection\\DataCollection\\*\\OpenHandleCollector.exe"
) and process.code_signature.trusted == true
) or
(
process.name : "NuGet.exe" and process.code_signature.trusted == true and user.id : ("S-1-5-18", "S-1-5-20")
)
) Field Validations
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