SEKOIA_Apt_Aptc60_Downloader_Strings

rule SEKOIA_Apt_Aptc60_Downloader_Strings : FILE
{
	meta:
		description = "Detects a simple downloader abusing wlrmdr.exe and used by APT-C-60"
		author = "Sekoia.io"
		id = "02fd6d5b-7211-46cc-bcff-ab5d78e459c0"
		date = "2024-09-05"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_aptc60_downloader_strings.yar#L1-L20"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		hash = "b14ef85a60ac71c669cc960bdf580144"
		logic_hash = "f05480834e6d91a852a190a2ecec05aaea1affa8a605a56c80962a9fbfc8f0c0"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "mydllmain" fullword
		$ = "-s 3600 -f 0 -t _ -m _ -a 11 -u" wide
		$ = "WlrMakeService" wide
		$ = "Trigger1" wide

	condition:
		uint16be( 0 ) == 0x4d5a and all of them and filesize < 500KB
}