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Detection rules › Sigma

Potential Ursnif Malware Activity - Registry

Status
test
Severity
high
Log source
product windows, category registry_add
Author
megan201296
Source
github.com/SigmaHQ/sigma

Detects registry keys related to Ursnif malware.

MITRE ATT&CK coverage

TacticTechniques
PersistenceT1112 Modify Registry
Defense ImpairmentT1112 Modify Registry

Event coverage

ProviderEventTitle
SysmonEvent ID 12RegistryEvent (Object create and delete)

Rule body yaml

title: Potential Ursnif Malware Activity - Registry
id: 21f17060-b282-4249-ade0-589ea3591558
status: test
description: Detects registry keys related to Ursnif malware.
references:
    - https://blog.yoroi.company/research/ursnif-long-live-the-steganography/
    - https://blog.trendmicro.com/trendlabs-security-intelligence/phishing-campaign-uses-hijacked-emails-to-deliver-ursnif-by-replying-to-ongoing-threads/
author: megan201296
date: 2019-02-13
modified: 2025-10-22
tags:
    - attack.persistence
    - attack.execution
    - attack.defense-impairment
    - attack.t1112
    - detection.emerging-threats
logsource:
    product: windows
    category: registry_add
detection:
    selection:
        TargetObject|endswith: '\Software\AppDataLow\Software\Microsoft\3A861D62-51E0-7C9D-AB0E-15700F2219A4'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    TargetObject|endswith: '\Software\AppDataLow\Software\Microsoft\3A861D62-51E0-7C9D-AB0E-15700F2219A4'

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.

FieldKindValues
TargetObjectends_with
  • \Software\AppDataLow\Software\Microsoft\3A861D62-51E0-7C9D-AB0E-15700F2219A4