Ursnif / Gozi / ISFB (also known as Ursnif, Gozi, ISFB, Dreambot) is a banking trojan active since 2007. Long-running banking trojan. Key characteristics include: web injects, VNC, video recording, source code leaked multiple times, still active variants.
Overview & Background
Long-running banking trojan. First identified in 2007, this threat is attributed to eCrime.
Threat Assessment
Ursnif remains an active threat. Organizations should implement detection rules and monitor for indicators associated with this banking trojan.
- Category: Banking Trojan
- Active since: 2007
- Attribution: eCrime
- Also known as: Ursnif, Gozi, ISFB, Dreambot
Technical Analysis
Ursnif employs the following capabilities and techniques:
- Web Injects: Core functionality
- Vnc: Core functionality
- Video Recording: Core functionality
- Source Code Leaked Multiple Times: Core functionality
- Still Active Variants: Core functionality
MITRE ATT&CK Mapping
| Tactic | Technique | Usage |
|---|---|---|
| Initial Access | T1566.001 Phishing Attachment | Common delivery vector |
| Execution | T1204.002 Malicious File | User-triggered execution |
| Persistence | T1547.001 Registry Run Keys | Autostart persistence |
| Defense Evasion | T1027 Obfuscated Files | Payload obfuscation |
| C2 | T1071.001 Web Protocols | HTTP/HTTPS C2 |
Detection & Defense
- Endpoint detection: Deploy behavioral detection rules for Ursnif indicators
- Network monitoring: Monitor for C2 traffic patterns and anomalous connections
- Threat intelligence: Track Ursnif IOCs and campaign updates
- Security awareness: Train users to recognize phishing and social engineering
- Patch management: Keep systems updated to prevent exploitation
Defend Against Ursnif
Mjolnir Security provides detection and response capabilities against Ursnif and similar threats.
Threat DetectionIncident ResponseThreat HuntingMDR ServicesThreat Intelligence
- Proactive Threat Hunting Hunt for Ursnif indicators and TTPs within your environment.
- Threat Intelligence Monitor Ursnif campaigns and infrastructure changes.
- 24/7 Incident Response Rapid containment and forensic investigation. Call +1 833 403 5875.
Written by: Mjolnir Security | Published: August 11, 2025
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