Potential Raspberry Robin Dot Ending File

SIGMA detection rule by Nasreddine Bencherchali (Nextron Systems) · NOASSERTION

Detects commandline containing reference to files ending with a "." This scheme has been seen used by raspberry-robin

title: Potential Raspberry Robin Dot Ending File
id: a35c97c8-d9c4-4c89-a3e7-533dc0bcb73a
status: test
description: Detects commandline containing reference to files ending with a "." This scheme has been seen used by raspberry-robin
author: Nasreddine Bencherchali (Nextron Systems)
references:
    - https://www.microsoft.com/en-us/security/blog/2022/10/27/raspberry-robin-worm-part-of-larger-ecosystem-facilitating-pre-ransomware-activity/
date: 2022-10-28
modified: 2023-02-05
tags:
    - attack.execution
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        # Example 1: https://www.microsoft.com/en-us/security/blog/wp-content/uploads/2022/10/fig-3f-raspberryrobin-runonce.png
        # Example 2: https://www.microsoft.com/en-us/security/blog/wp-content/uploads/2022/10/fig-5f-odbcconf.png
        # Example 3: https://www.microsoft.com/en-us/security/blog/wp-content/uploads/2022/10/fig-6f-fauppod-command-line.png
        CommandLine|re: \\[a-zA-Z0-9]{1,32}\.[a-zA-Z0-9]{1,6}\.[ "']{1}  # cannot match on end-of-line because of FPs with bind DNS notation
    condition: selection
falsepositives:
    - Unknown
level: high

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

e709814c-5a03-4161-8852-cc53fa4d1864

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

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What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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