SIGNATURE_BASE_MAL_JS_NPM_Supplychain_Attack_Sep25

rule SIGNATURE_BASE_MAL_JS_NPM_Supplychain_Attack_Sep25 : FILE
{
	meta:
		description = "Detects obfuscated JavaScript in NPM packages used in supply chain crypto stealer attacks in September 2025"
		author = "Florian Roth"
		id = "f083233e-348a-5b7d-a128-181c543a279c"
		date = "2025-09-09"
		modified = "2025-11-29"
		reference = "https://www.linkedin.com/feed/update/urn:li:activity:7370889385992437760/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/mal_npm_supply_chain_sep25.yar#L1-L21"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "16f6c756bc8ce5ef5d9aa1ded0f811ec0c9cee3d8f85cc151b8ca1df7b8a4337"
		logic_hash = "1b83d1bd79cdff02ed2fff7bf1feb57801ff9a933de1bd4f7ceecf738213ab4c"
		score = 85
		quality = 85
		tags = "FILE"

	strings:
		$x1 = "const _0x112fa8=_0x180f;(function(_0x13c8b9" ascii
		$fp1 = "<html"
		$fp2 = "<xml "
		$fp3 = "<?xml"

	condition:
		filesize < 200KB and 1 of ( $x* ) and not 1 of ( $fp* )
}