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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_MAL_CN_Wocao_Checkadmin_Bin

Checkadmin utility

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

Checkadmin utility

It defines 3 patterns (2 text, 1 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
apt-mal-cn-wocao-checkadmin-bin.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_MAL_CN_Wocao_Checkadmin_Bin
{
	meta:
		description = "Checkadmin utility"
		author = "Fox-IT SRT"
		id = "2f819213-ade1-525b-af18-d77b7fc96093"
		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#L215-L232"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "784ec960ce2733aebc404ee5c09bb852eb45553ad167db292d05b82feedbd5a6"
		score = 75
		quality = 85
		tags = ""

	strings:
		$a = "[-] %s * A system error has occurred: %d" ascii wide
		$b = {
            0D 00 0A 00 25 00 6C 00 64 00 20 00 72 00 65 00
            73 00 75 00 6C 00 74 00 73 00 2E 00 0D 00 0A 00
        }
		$c = "%s\t<Access denied>" ascii wide

	condition:
		1 of them
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$atext"[-] %s * A system error has occurred: %d"ascii wide
$bhex{ 0D 00 0A 00 25 00 6C 00 64 00 20 00 72 00 65 00 73 00 75 00 6C 00 74 00 73 00 2E 00 0D 00 0A 00 }
$ctext"%s\t<Access denied>"ascii wide

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: 2f819213-ade1-525b-af18-d77b7fc96093

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