SEKOIA_Apt_Apt37_Malicious_Hta_File

rule SEKOIA_Apt_Apt37_Malicious_Hta_File : FILE
{
	meta:
		description = "Detects malicious APT37 files"
		author = "Sekoia.io"
		id = "22a98c27-8ff4-4760-b505-f8eacf4dabda"
		date = "2023-03-06"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_apt37_malicious_hta_file.yar#L1-L20"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "85289bea86641ea9c359c361d075783449d453017485170abc87c47872792210"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$s1 = "<HTML>" nocase
		$s2 = " UwB0AGEAcgB0AC0AUwBs" ascii
		$s3 = "= new ActiveXObject(" ascii
		$s4 = "\", \"\", \"open\", 0);" ascii
		$s5 = ".moveTo(" ascii
		$s6 = "self.close();"

	condition:
		$s1 at 0 and all of them and filesize < 1MB
}