Full Report
2025-03-23 • AviaB • AviaB • win.vidar Open article on Malpedia
Analysis Summary
# Tool/Technique: Vidar Stealer
## Overview
Vidar Stealer is a sophisticated information-stealing malware designed to harvest credentials, cryptocurrency wallets, session cookies, and other sensitive data from compromised Windows systems. It functions as a comprehensive data exfiltration tool.
## Technical Details
- Type: Malware family
- Platform: Windows
- Capabilities: Credential stealing, cryptocurrency wallet dumping, session cookie theft, data aggregation, and secure exfiltration.
- First Seen: Information not explicitly provided in the context, but context suggests recent analysis in March 2025.
## MITRE ATT&CK Mapping
*Since the provided context only lists the malware name and associated reports/authors rather than specific techniques, a generalized mapping for information stealers is used based on common expected TTPs.*
- **TA0009 - Credential Access**
- T1003 - OS Credential Dumping
- T1056 - Input Capture
- T1056.001 - Keylogging
- **TA0010 - Exfiltration**
- T1041 - Exfiltration Over C2 Channel
## Functionality
### Core Capabilities
- Stealing saved passwords and form fill data from various web browsers (e.g., Chrome, Firefox, Edge).
- Targeting and stealing cryptocurrency wallet information (private keys, wallet balances).
- Harvesting system information, cookies, and potentially screen captures.
- Compressing and exfiltrating collected data to its command and control (C2) infrastructure.
### Advanced Features
- Sophisticated modules designed to target specific data types relevant to financial accounts and digital assets.
- Functionality tailored for high volume and focused data theft, typical of modern stealer malware.
## Indicators of Compromise
*No specific IOCs (Hashes, IPs, Domains) are listed in the supplied truncated article.*
- File Hashes: [Not provided]
- File Names: [Not provided]
- Registry Keys: [Not provided]
- Network Indicators: [Not provided (Defanged) - C2 communication for exfiltration expected]
- Behavioral Indicators: Unauthorized access to browser profile directories, reading and writing sensitive data files, outbound network connections to remote hosts for data upload.
## Associated Threat Actors
- [Not explicitly named in the provided context, but typically associated with cybercrime syndicates distributing loaders or sold on darknet forums.]
## Detection Methods
- Signature-based detection: Signatures targeting known file paths, mutexes, or C2 communication patterns associated with Vidar.
- Behavioral detection: Monitoring for processes attempting to read data from locked browser credential stores or crypto wallet directories.
- YARA rules: Rules targeting specific strings or binary structures unique to the Vidar binary.
## Mitigation Strategies
- Implementing strong Multi-Factor Authentication (MFA) across all critical accounts.
- Regularly updating browsers and operating systems to patch known vulnerabilities that could allow initial access.
- Restricting or sandboxing applications that request access to sensitive user profiles.
- Deploying endpoint detection and response (EDR) solutions capable of detecting file access anomalies related to credential harvesting.
## Related Tools/Techniques
Vidar is often grouped with other prominent information stealers such as:
- Agent Tesla
- RedLine Stealer
- Raccoon Stealer
- Anubis Stealer