Detection rules › Sigma
Ursnif Redirection Of Discovery Commands
Detects the redirection of Ursnif discovery commands as part of the initial execution of the malware.
Known false positives
- Unlikely
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution |
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: 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
Stages and Predicates
Stage 0: condition
selectionStage 1: selection
selection:
ParentImage|endswith: '\explorer.exe'
Image|endswith: '\cmd.exe'
CommandLine|contains|all:
- '/C '
- ' >> *\AppData\local\temp\*.bin'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
CommandLine | match |
| field:"CommandLine" kind:match |
Image | ends_with |
| field:"Image" kind:ends_with value:"\cmd.exe" |
ParentImage | ends_with |
| field:"ParentImage" kind:ends_with value:"\explorer.exe" |