SEKOIA_Apt_Gamaredon_Htmlsmuggling_Attachment_Stage2

rule SEKOIA_Apt_Gamaredon_Htmlsmuggling_Attachment_Stage2 : FILE
{
	meta:
		description = "Detects Gamaredon HTMLSmuggling attachment"
		author = "Sekoia.io"
		id = "e82335ea-48d5-409c-a270-cfd5a2197c44"
		date = "2023-01-20"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/apt_gamaredon_htmlsmuggling_attachment_stage2.yar#L1-L19"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "42e637f628db6719342ae104c6c89bb80609c5f3f5c2586daccb31f7d688a2a1"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = ") == -1) die();" ascii
		$ = "'data:application/x-rar-compressed;base64, ' +" ascii
		$ = ".appendChild(img);" ascii
		$ = "['Win32', 'Win64', 'Windows', 'WinCE'].indexOf(" ascii
		$ = " = navigator[\"platform\"];" ascii

	condition:
		4 of them and filesize < 1MB
}