SEKOIA_Apt_Konni

rule SEKOIA_Apt_Konni : FILE
{
	meta:
		description = "Rule based on structure offsets and file extension"
		author = "Sekoia.io"
		id = "6a20c492-e932-41bd-ac4a-01d35bfb0c49"
		date = "2022-09-12"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_konni.yar#L1-L25"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "8f178421fd0968f4ce809054022579c7fc8dede5f6514e89966d13acb83d75d9"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ext_1 = ".zip" wide ascii fullword
		$ext_2 = ".cab" wide ascii fullword
		$ext_3 = ".rar" wide ascii fullword
		$ext_4 = ".ini" wide ascii fullword
		$ext_5 = ".dat" wide ascii fullword
		$offset_structure_1 = { 8d ?? 08 02 00 00 }
		$offset_structure_2 = { 8d ?? 10 04 00 00 }
		$offset_structure_3 = { 8d ?? 18 06 00 00 }
		$url = "%s/dn.php?name=%s&prefix=%s" wide

	condition:
		uint16be( 0 ) == 0x4d5a and filesize < 3MB and 3 of ( $ext_* ) and all of ( $offset_structure_* ) and $url
}