TRELLIX_ARC_RANSOM_Suncrypt_Decryptor

rule TRELLIX_ARC_RANSOM_Suncrypt_Decryptor : RANSOMWARE FILE
{
	meta:
		description = "Rule to detect SunCrypt ransomware decryptor"
		author = "McAfee ATR Team"
		id = "ec0d3811-6083-5537-bf29-32ee02d43b5e"
		date = "2020-10-02"
		modified = "2020-11-02"
		reference = "https://github.com/advanced-threat-research/Yara-Rules/"
		source_url = "https://github.com/advanced-threat-research/Yara-Rules//blob/1919562a59f190bda60c982424f6a24c542ee3e0/ransomware/RANSOM_Suncrypt.yar#L27-L50"
		license_url = "https://github.com/advanced-threat-research/Yara-Rules//blob/1919562a59f190bda60c982424f6a24c542ee3e0/LICENSE"
		hash = "a0f99367b0a0a358ed6e5ae25904016d02aef6aa7c0423c34aa3ec3fd6354310"
		logic_hash = "59d1193bb0f8d3983a181394b5dd5247470d9e118cc4fe0674167f162bcdb6e1"
		score = 75
		quality = 70
		tags = "RANSOMWARE, FILE"
		rule_version = "v1"
		malware_type = "ransomware"
		malware_family = "Ransomware:W32/Suncrypt"
		actor_type = "Cybercrime"
		actor_group = "Unknown"

	strings:
		$pattern = {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}

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 400KB and all of them
}