DITEKSHEN_MALWARE_Win_Fakecaptcha_Downloader

rule DITEKSHEN_MALWARE_Win_Fakecaptcha_Downloader : FILE
{
	meta:
		description = "Detects downloader executables dropped by fake captcha"
		author = "ditekshen"
		id = "d577e8ef-11df-565c-9925-63b8768a7115"
		date = "2020-11-06"
		modified = "2024-11-01"
		reference = "https://github.com/ditekshen/detection"
		source_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/yara/malware.yar#L11793-L11803"
		license_url = "https://github.com/ditekshen/detection/blob/e76c93dcdedff04076380ffc60ea54e45b313635/LICENSE.txt"
		logic_hash = "57c39ce93f74d03767e7fde53281983a8462e4f3705d1bb9084bc169a08a0f83"
		score = 75
		quality = 75
		tags = "FILE"

	strings:
		$s1 = "</script>MZ" ascii
		$s2 = "window.close();" ascii
		$s3 = "eval(" ascii

	condition:
		uint16( 0 ) == 0x5a4d and all of them
}