Ursnif Redirection Of Discovery Commands

Description

Detects the redirection of Ursnif discovery commands as part of the initial execution of the malware.

Query · sigma

selection:
  ParentImage|endswith: \explorer.exe
  Image|endswith: \cmd.exe
  CommandLine|contains|all:
  - '/C '
  - ' >> *\AppData\local\temp\*.bin'
condition: selection

Known false positives

  • Unlikely
Raw source Ursnif Redirection Of Discovery Commands · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Ursnif Redirection Of Discovery Commands
id: 7aaa5739-12fc-41aa-b98b-23ec27d42bdf
status: test
description: |
    Detects the redirection of Ursnif discovery commands as part of the initial execution of the malware.
references:
    - Internal Research
author: '@kostastsale'
date: 2023-07-16
tags:
    - attack.execution
    - attack.t1059
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\explorer.exe'
        Image|endswith: '\cmd.exe'
        CommandLine|contains|all:
            - '/C '
            - ' >> *\AppData\local\temp\*.bin'
    condition: selection
falsepositives:
    - Unlikely
level: high

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