SEKOIA_Yara_Runascs

import "pe"

rule SEKOIA_Yara_Runascs : FILE
{
	meta:
		description = "No description has been set in the source file - SEKOIA"
		author = "Sekoia.io"
		id = "1720f042-2cc6-4ef1-b66c-fe8a4214366a"
		date = "2023-08-23"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/yara_runascs.yar#L3-L33"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "fe9b02704d07b5ebe6ad94283e4c1ec2846a54f5c1fb2115a1f6411cf8c19059"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "RunasCs" ascii wide
		$s2 = "LOGON32_LOGON_INTERACTIVE" ascii wide
		$s3 = "LOGON32_LOGON_NETWORK" ascii wide
		$s4 = "LOGON32_LOGON_BATCH" ascii wide
		$s5 = "LOGON32_LOGON_SERVICE" ascii wide
		$s6 = "dwLogonProvider" ascii wide
		$s7 = "LogonUser" ascii wide
		$s8 = "CreateProcessAsUser" ascii wide

	condition:
		( uint32be( 0 ) == 0x7f454c46 or uint16be( 0 ) == 0x4d5a ) and filesize < 4MB and all of them and not ( pe.version_info [ "OriginalFilename" ] == "Atera.AgentPackages.CommonLib.dll" and for any sig in pe.signatures : ( sig.subject contains "CN=Atera Networks Ltd" and sig.issuer contains "CN=DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1" ) )
}