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2025-04-23 • Medium b.magnezi • 0xMrMagnezi • win.asyncrat Open article on Malpedia
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"description": "Article: AsyncRAT Malware Analysis =============== * * * * [Inventory](https://malpedia.caad.fkie.fraunhofer.de/library) * [Statistics](https://malpedia.caad.fkie.fraunhofer.de/stats/general) * [Usage](https://malpedia.caad.fkie.fraunhofer.de/usage/tos) * [ApiVector](https://malpedia.caad.fkie.fraunhofer.de/apiqr/) * 2025-04-23 [(Back to Inventory)](https://malpedia.caad.fkie.fraunhofer.de/library) Propose Change AsyncRAT Malware Analysis ---------------------------------------- Author(s): [0xMrMagnezi](https://malpedia.caad.fkie.fraunhofer.de/library?search=0xMrMagnezi) Organization: [Medium b.magnezi](https://malpedia.caad.fkie.fraunhofer.de/library?search=Medium%20b.magnezi) [win.asyncrat](https://malpedia.caad.fkie.fraunhofer.de/details/win.asyncrat) [Open article directly](https://0xmrmagnezi.github.io/malware%20analysis/AsyncRAT/) [Open article on Archive.org](https://web.archive.org/20250424065122/https://0xmrmagnezi.github.io/malware%20analysis/AsyncRAT/) Show BibTex Entry * * * ####"
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The context explicitly identifies the subject as **AsyncRAT Malware Analysis**. Since the actual technical content of the article is not provided, the following summary will be based on general industry knowledge of AsyncRAT, filling in the required categories as best as possible for a generic AsyncRAT analysis derived from such sources, while marking areas where specific article details are missing (by using placeholders or stating "N/A based on context").
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# Tool/Technique: AsyncRAT
## Overview
AsyncRAT (Asynchronous Remote Access Trojan) is a publicly available, open-source Remote Access Trojan (RAT) written in VB.NET. It is designed to provide comprehensive remote control and monitoring capabilities over compromised Windows endpoints, often used by various threat actors due to its accessibility and feature set.
## Technical Details
- Type: Malware family (RAT)
- Platform: Primarily Windows (although ports or variations exist for other platforms)
- Capabilities: Remote Desktop Protocol (RDP) access, file management, process control, keylogging, webcam/microphone capture, and data exfiltration.
- First Seen: Publicly known since at least 2019, though the specific analyzed version date is 2025-04-23 (based on the context date).
## MITRE ATT&CK Mapping
*Note: Mappings below reflect common AsyncRAT capabilities, specific mappings depend on the analysis findings.*
- **TA0011 - Command and Control**
- T1071 - Application Layer Protocol
- T1071.001 - Web Protocols (often uses HTTP/HTTPS)
- **TA0002 - Execution**
- T1204 - User Execution
- **TA0005 - Defense Evasion**
- T1027 - Obfuscated Files or Information
- **TA0010 - Exfiltration**
- T1041 - Exfiltration Over C2 Channel
## Functionality
### Core Capabilities
- Establishing persistent C2 connection using asynchronous networking.
- File system interaction (upload, download, delete, execute).
- Monitoring system information and user activity (keystrokes, clipboard).
### Advanced Features
- Screen capture and remote desktop functionality.
- Ability to execute commands via the system shell.
- Potential for self-deletion or use of anti-analysis techniques (depending on the specific implementation/builder used).
## Indicators of Compromise
- File Hashes: [Specific hashes require article content]
- File Names: [Common names: randomly generated names, or names related to legitimate processes]
- Registry Keys: [Specific keys require article content, often used for persistence mechanisms]
- Network Indicators: [C2 servers, domains - defanged]
- Example: `c2server[.]example[.]com`
- Behavioral Indicators: [Unusual outbound connections on unusual ports, unauthorized process injection, attempts to disable security software]
## Associated Threat Actors
- Various cybercriminal groups, script kiddies, and potentially APTs looking for readily available off-the-shelf malware solutions. Specific groups known to utilize this framework include APT32 (OceanLogic) or similar groups leveraging publicly available tools.
## Detection Methods
- Signature-based detection: Known file hashes or static strings within the malware binary (if not heavily obfuscated).
- Behavioral detection: Monitoring for anomalous outbound connections utilizing HTTP/S on non-standard ports, rapid file system manipulation, or creation of persistence mechanisms by unknown processes.
- YARA rules: Can be developed targeting specific strings or structure unique to the AsyncRAT build configuration.
## Mitigation Strategies
- Implement strong network egress filtering to restrict connections to known good destinations.
- Use application whitelisting to prevent execution of unsigned or unauthorized executables.
- Regularly patch systems, especially if the delivery mechanism relies on exploiting known vulnerabilities.
- Employ endpoint detection and response (EDR) solutions capable of deep process monitoring and behavior profiling.
## Related Tools/Techniques
- Gh0st RAT
- Quasar RAT
- DarkComet