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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_SUSP_Anydesk_Compromised_Certificate_Jan24_2

Detects binaries signed with a compromised signing certificate of AnyDesk that aren't AnyDesk itself (philandro Software GmbH, 0DBF152DEAF0B981A8A938D53F769DB8; permissive version)

Suspicious / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
Florian Roth
Date
2024-02-02
Modified
2024-04-24
Score / Quality
65 / 85

What this rule detects

Detects binaries signed with a compromised signing certificate of AnyDesk that aren't AnyDesk itself (philandro Software GmbH, 0DBF152DEAF0B981A8A938D53F769DB8; permissive version)

Targets: Windows PE.

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

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
susp-anydesk-compromised-certificate-jan24-2.yarDetection Rule License 1.1
rule SIGNATURE_BASE_SUSP_Anydesk_Compromised_Certificate_Jan24_2 : FILE
{
	meta:
		description = "Detects binaries signed with a compromised signing certificate of AnyDesk that aren't AnyDesk itself (philandro Software GmbH, 0DBF152DEAF0B981A8A938D53F769DB8; permissive version)"
		author = "Florian Roth"
		id = "a41af8d8-ebdf-5a2f-8cf5-abd4587bdfc5"
		date = "2024-02-02"
		modified = "2024-04-24"
		reference = "https://anydesk.com/en/public-statement"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_anydesk_compromised_cert_feb23.yar#L38-L56"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "86f708233d5a6a46d367430dcc65b128e8dc7ec24eda774ff3860101cc16c9fc"
		score = 65
		quality = 85
		tags = "FILE"

	strings:
		$sc1 = { 0D BF 15 2D EA F0 B9 81 A8 A9 38 D5 3F 76 9D B8 }
		$s2 = "DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1"
		$f1 = "AnyDesk Software GmbH" wide

	condition:
		uint16( 0 ) == 0x5a4d and filesize < 20000KB and all of ( $s* ) and not 1 of ( $f* )
}

Strings (3 patterns)

IdentifierTypeValueModifiers
$sc1hex{ 0D BF 15 2D EA F0 B9 81 A8 A9 38 D5 3F 76 9D B8 }
$s2text"DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1"
$f1text"AnyDesk Software GmbH"wide

Condition

uint16( 0 ) == 0x5a4d and filesize < 20000KB and all of ( $s* ) and not 1 of ( $f* )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • The file must be smaller than 20000KB (a cheap guard that skips large files).
  • All patterns in ( $s* ) must match.
  • At least 1 patterns in ( $f* ) must match.

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Drop a file here or click to chooseScanned locally with YARA-X. Files up to 200 MB.

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References

Licence & attribution

Author: Florian Roth

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: a41af8d8-ebdf-5a2f-8cf5-abd4587bdfc5

Tags:FILE

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