Detection rules › Sigma
Ursnif Redirection Of Discovery Commands
Detects the redirection of Ursnif discovery commands as part of the initial execution of the malware.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1059 Command and Scripting Interpreter |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
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
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|
ParentImage | ends_with |
|