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YARA · BlackBerry Research & Intelligence (via Open-Source-YARA-rules)

BLACKBERRY_Mal_Infostealer_EXE_Jupyter_Cert_36Ff

Detects Jupter executables by certificate OOO Sistema (36ff)

MalwareBlackBerry Research & Intelligence (via Open-Source-YARA-rules)Apache License 2.0Compiles with YARA-X (with warnings)
Author
BlackBerry Research & Intelligence Team
Date
2021-10-14
Modified
2022-07-06
Score / Quality
75 / 85

What this rule detects

Detects Jupter executables by certificate OOO Sistema (36ff)

Targets: Windows PE.

It has no patterns: the condition alone decides (modules, file properties or other rules). YARA modules used: pe.

YARA-X says: warning[deprecated_field]: field `number_of_signatures` is deprecated

Summary generated from the rule's metadata and condition.

Rule source

Download .yar

Includes the imports needed to compile it on its own.

mal-infostealer-exe-jupyter-cert-36ff.yarApache License 2.0
import "pe"

rule BLACKBERRY_Mal_Infostealer_EXE_Jupyter_Cert_36Ff : FILE
{
	meta:
		description = "Detects Jupter executables by certificate OOO Sistema (36ff)"
		author = "BlackBerry Research & Intelligence Team"
		id = "5671b149-4eb6-5b13-92de-01b71a001802"
		date = "2021-10-14"
		modified = "2022-07-06"
		reference = "https://blogs.blackberry.com/en/2022/01/threat-thursday-jupyter-infostealer-is-a-master-of-disguise"
		source_url = "https://github.com/mikesxrs/Open-Source-YARA-rules/blob/ec0056f767db98bf6d5fd63877ad51fb54d350e9/Blackberry/Mal_Infostealer_EXE_Jupyter_Cert_36ff.yar#L3-L18"
		license_url = "N/A"
		logic_hash = "8f543c592f23257bda8902229a9a8a735bb593254b279a1786fc85734cd56905"
		score = 75
		quality = 85
		tags = "FILE"
		license = "This Yara rule is provided under the Apache License 2.0 (https://www.apache.org/licenses/LICENSE-2.0) and open to any user or organization, as long as you use it under this license and ensure originator credit in any derivative to The BlackBerry Research & Intelligence Team"

	condition:
		uint16( 0 ) == 0x5a4d and for any i in ( 0 .. pe.number_of_signatures ) : ( pe.signatures [ i ] . issuer contains "Certum Extended Validation Code Signing CA SHA2" and pe.signatures [ i ] . serial == "36:ff:67:4e:b3:05:e9:9c:35:56:5f:a3:01:d5:c4:b0" )
}

Condition

uint16( 0 ) == 0x5a4d and for any i in ( 0 .. pe.number_of_signatures ) : ( pe.signatures [ i ] . issuer contains "Certum Extended Validation Code Signing CA SHA2" and pe.signatures [ i ] . serial == "36:ff:67:4e:b3:05:e9:9c:35:56:5f:a3:01:d5:c4:b0" )

In plain words (Heuristic)

  • The file must start with “MZ” — a Windows executable (PE).
  • A for-loop checks a property over several matches or items.
  • Uses the pe module.
  • Checks the Authenticode signature.

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References

Licence & attribution

Author: BlackBerry Research & Intelligence Team

Source repository: BlackBerry Research & Intelligence (via Open-Source-YARA-rules) @ ec0056f767

Licence: Apache License 2.0 (stated in the rule's own meta)

“This Yara rule is provided under the Apache License 2.0 (https://www.apache.org/licenses/LICENSE-2.0) and open to any user or organization, as long as you use it under this license and ensure originator credit in any derivative to The BlackBerry Research & Intelligence Team”

Original rule

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

Rule id: 5671b149-4eb6-5b13-92de-01b71a001802

Tags:FILE