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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_MAL_CN_Wocao_Webshell_Ver_Jsp

Strings from the ver.jsp webshell

APT / threat actorSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Fox-IT SRT
Date
2019-12-20
Modified
2023-12-05
Score / Quality
75 / 85

What this rule detects

Strings from the ver.jsp webshell

It defines 6 patterns (6 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-mal-cn-wocao-webshell-ver-jsp.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_MAL_CN_Wocao_Webshell_Ver_Jsp
{
	meta:
		description = "Strings from the ver.jsp webshell"
		author = "Fox-IT SRT"
		id = "b2828b84-8934-5111-9345-683a07025070"
		date = "2019-12-20"
		modified = "2023-12-05"
		reference = "https://www.fox-it.com/en/news/whitepapers/operation-wocao-shining-a-light-on-one-of-chinas-hidden-hacking-groups/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_op_wocao.yar#L355-L372"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "ada6de4b07a76e79bb17793cda2b51f96554a35992a73f59c360487638ae3be3"
		score = 75
		quality = 85
		tags = ""

	strings:
		$a = "String strLogo = request.getParameter(\"id\")"
		$b = "!strLogo.equals(\"256\")"
		$c = "boolean chkos = msg.startsWith"
		$d = "while((c = er.read()) != -1)"
		$e = "out.print((char)c);}in.close()"
		$f = "out.print((char)c);}er.close()"

	condition:
		1 of them
}

Strings (6 patterns)

IdentifierTypeValueModifiers
$atext"String strLogo = request.getParameter(\"id\")"
$btext"!strLogo.equals(\"256\")"
$ctext"boolean chkos = msg.startsWith"
$dtext"while((c = er.read()) != -1)"
$etext"out.print((char)c);}in.close()"
$ftext"out.print((char)c);}er.close()"

Condition

1 of them

In plain words (Heuristic)

  • At least 1 patterns in the rule must match.

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References

Licence & attribution

Author: Fox-IT SRT

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: b2828b84-8934-5111-9345-683a07025070

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