SEKOIA_Loader_Fakebat_Powershell_Fingerprint_May24

rule SEKOIA_Loader_Fakebat_Powershell_Fingerprint_May24 : FILE
{
	meta:
		description = "Finds FakeBat PowerShell script fingerprinting the infected host."
		author = "Sekoia.io"
		id = "7efcf9cf-78fe-400e-abe3-6955c394e358"
		date = "2024-06-21"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/loader_fakebat_powershell_fingerprint_may24.yar#L1-L27"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "04e5c888e5f71873c4fa2d732fbd8e40be3edf406300e65e489e1fa378028c5f"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$str01 = "Get-WmiObject Win32_ComputerSystem" ascii
		$str02 = "-Class AntiVirusProduct" ascii
		$str03 = "status = \"start\"" ascii
		$str04 = " | ConvertTo-Json" ascii
		$str05 = ".FromXmlString(" ascii
		$str06 = " = Invoke-RestMethod -Uri " ascii
		$str07 = ".Exception.Response.StatusCode -eq 'ServiceUnavailable'" ascii
		$str08 = "Invoke-WebRequest -Uri $url -OutFile " ascii
		$str09 = "--batch --yes --passphrase-fd" ascii
		$str10 = "--decrypt --output" ascii
		$str11 = "Invoke-Expression \"tar --extract --file=" ascii

	condition:
		7 of them and filesize < 10KB and true
}