Raspberry Robin Subsequent Execution of Commands

Status: test
Severity: high
Log source: category process_creation, product windows
Author: @kostastsale
Source: github.com/SigmaHQ/sigma

Detects raspberry robin subsequent execution of commands.

Known false positives

Unlikely

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059.001` Command and Scripting Interpreter: PowerShell

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation
Security-Auditing	Event ID 4688: A new process has been created.

Rule body

title: Raspberry Robin Subsequent Execution of Commands
id: d52d2e87-eb03-4fac-961d-eb616da79788
related:
    - id: 2c6bea3a-ef58-4f2e-a775-4928f6b7c58a
      type: similar
status: test
description: Detects raspberry robin subsequent execution of commands.
references:
    - https://redcanary.com/blog/raspberry-robin/
author: '@kostastsale'
date: 2022-05-06
tags:
    - attack.execution
    - attack.t1059.001
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\fodhelper.exe'
        Image|endswith:
            - '\rundll32.exe'
            - '\regsvr32.exe'
        CommandLine|contains|all:
            - 'odbcconf.exe'
            - 'regsvr'
            - 'shellexec_rundll'
        CommandLine|contains:
            - 'installdriver'
            - 'setfiledsndir'
            - 'vkipdse'
        CommandLine|endswith|windash:
            - '/a'
            - '/f'
            - '/s'
    condition: selection
falsepositives:
    - Unlikely
level: high

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    ParentImage|endswith: '\fodhelper.exe'
    Image|endswith:
        - '\rundll32.exe'
        - '\regsvr32.exe'
    CommandLine|contains|all:
        - 'odbcconf.exe'
        - 'regsvr'
        - 'shellexec_rundll'
    CommandLine|contains:
        - 'installdriver'
        - 'setfiledsndir'
        - 'vkipdse'
    CommandLine|endswith|windash:
        - '/a'
        - '/f'
        - '/s'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	ends_with	`/a` transforms: `windash` `/f` transforms: `windash` `/s` transforms: `windash`	`field:"CommandLine" kind:ends_with`
`CommandLine`	match	`installdriver` `odbcconf.exe` `regsvr` corpus 2 (sigma 1, splunk 1) `setfiledsndir` `shellexec_rundll` corpus 3 (sigma 3) `vkipdse`	`field:"CommandLine" kind:match`
`Image`	ends_with	`\regsvr32.exe` corpus 64 (sigma 64) `\rundll32.exe` corpus 94 (sigma 94)	`field:"Image" kind:ends_with`
`ParentImage`	ends_with	`\fodhelper.exe` corpus 2 (sigma 2)	`field:"ParentImage" kind:ends_with value:"\fodhelper.exe"`

Raspberry Robin Subsequent Execution of Commands

Known false positives

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection

Indicators

Stage 0: `condition`

Stage 1: `selection`