SEKOIA_Shell_Win_Danfuan

rule SEKOIA_Shell_Win_Danfuan : FILE
{
	meta:
		description = "Detect the Danfuan malware"
		author = "Sekoia.io"
		id = "d1cf9988-270b-4a22-bdd5-f40b625715a8"
		date = "2022-11-04"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/shell_win_danfuan.yar#L1-L18"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "96929ef478a8773022233a4092b3c157867aae6ee185568a6327d033c05a68f1"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "<%@ WebHandler Language=\"C#\" class=\"DynamicCodeCompiler\"%>"
		$ = "CompilerResults compilerResults = compiler.CompileAssemblyFromSource(comPara, SourceText(txt))"
		$ = "MethodInfo objMifo = objInstance.GetType().GetMethod("

	condition:
		filesize < 15KB and all of them
}