Upatre Loader (also known as Upatre) is a malware loader active since 2013. Classic small downloader. Key characteristics include: tiny downloader (~50KB), historically delivered Dyre/GameOver Zeus, spam distribution.
Overview & Background
Classic small downloader. First identified in 2013, this threat is attributed to eCrime.
Threat Assessment
Upatre Loader remains an active threat. Organizations should implement detection rules and monitor for indicators associated with this malware loader.
- Category: Malware Loader
- Active since: 2013
- Attribution: eCrime
- Also known as: Upatre
Technical Analysis
Upatre Loader employs the following capabilities and techniques:
- Tiny Downloader (~50Kb): Core functionality
- Historically Delivered Dyre/Gameover Zeus: Core functionality
- Spam Distribution: 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 Upatre Loader indicators
- Network monitoring: Monitor for C2 traffic patterns and anomalous connections
- Threat intelligence: Track Upatre Loader IOCs and campaign updates
- Security awareness: Train users to recognize phishing and social engineering
- Patch management: Keep systems updated to prevent exploitation
Defend Against Upatre Loader
Mjolnir Security provides detection and response capabilities against Upatre Loader and similar threats.
Threat DetectionIncident ResponseThreat HuntingMDR ServicesThreat Intelligence
- Proactive Threat Hunting Hunt for Upatre Loader indicators and TTPs within your environment.
- Threat Intelligence Monitor Upatre Loader campaigns and infrastructure changes.
- 24/7 Incident Response Rapid containment and forensic investigation. Call +1 833 403 5875.
Written by: Mjolnir Security | Published: September 13, 2025
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