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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_MAL_CN_Wocao_Info_Vbs

Strings from the information grabber VBS

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 information grabber VBS

It defines 8 patterns (8 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-mal-cn-wocao-info-vbs.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_MAL_CN_Wocao_Info_Vbs
{
	meta:
		description = "Strings from the information grabber VBS"
		author = "Fox-IT SRT"
		id = "b719fb31-2836-5faf-a7c8-c361a14df2be"
		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#L297-L316"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "e37f8768c7920b8c3d9fdd6bb3a4e748c47a6c06a8aaed01655355ef3d8c3457"
		score = 75
		quality = 85
		tags = ""

	strings:
		$ = "Logger PingConnect"
		$ = "Logger GetAdmins"
		$ = "Logger InstallPro"
		$ = "Logger Exec"
		$ = "retstr = adminsName & \" Members\" & vbCrLf & _"
		$ = "Logger VolumeName & \" (\" & objDrive.DriveLetter & \":)\" _"
		$ = "txtRes = txtRes & machine & \" can"
		$ = "retstr = \"PID   SID Image Name\" & vbCrLf & \"===="

	condition:
		4 of them
}

Strings (8 patterns)

IdentifierTypeValueModifiers
$text"Logger PingConnect"
$text"Logger GetAdmins"
$text"Logger InstallPro"
$text"Logger Exec"
$text"retstr = adminsName & \" Members\" & vbCrLf & _"
$text"Logger VolumeName & \" (\" & objDrive.DriveLetter & \":)\" _"
$text"txtRes = txtRes & machine & \" can"
$text"retstr = \"PID SID Image Name\" & vbCrLf & \"===="

Condition

4 of them

In plain words (Heuristic)

  • At least 4 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: b719fb31-2836-5faf-a7c8-c361a14df2be

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