Full Report
2025-06-17 • Palo Alto Networks Unit 42 • Dominik Reichel • win.kimjongrat Open article on Malpedia
Analysis Summary
# Tool/Technique: KimJongRAT Stealer Variant (PowerShell Implementation)
## Overview
This entry discusses a new variant of the KimJongRAT stealer, specifically highlighting its implementation written in PowerShell. KimJongRAT is generally known as a remote access trojan (RAT) but this variant appears to incorporate stealer functionality alongside remote control capabilities.
## Technical Details
- Type: Malware family (Variant)
- Platform: Windows (Inferred from PowerShell usage)
- Capabilities: Remote administration, credential/information theft.
- First Seen: Information not explicitly provided in the context, but the article implies recent discovery.
## MITRE ATT&CK Mapping
*(Note: Specific mappings are not detailed in the context, but based on the description of a RAT/Stealer, the following are highly probable tactics/techniques for this type of malware.)*
- TA0001 - Initial Access
- T1566 - Phishing
- TA0005 - Defense Evasion
- T1027 - Obfuscated Files or Information
- TA0008 - Lateral Movement
- TA0011 - Command and Control
- T1071 - Application Layer Protocol
- TA0010 - Data Exfiltration
- T1041 - Exfiltration Over C2 Channel
## Functionality
### Core Capabilities
- Remote access and control (due to being a RAT).
- Stealing sensitive information (as implied by the "Stealer Variant" designation).
- Execution via a PowerShell implementation, likely leveraging built-in system tools for execution and evasion.
### Advanced Features
- The use of PowerShell suggests fileless execution or leveraging native tooling, which aids in evading traditional endpoint detection systems focused on file-based malware signatures.
## Indicators of Compromise
- File Hashes: [Not provided in context]
- File Names: [Not provided in context]
- Registry Keys: [Not provided in context]
- Network Indicators: [Not provided in context]
- Behavioral Indicators: Execution of complex scripts via `powershell.exe` or `pwsh.exe`, remote communication attempts.
## Associated Threat Actors
- [Not explicitly named in context, associated with KimJongRAT operators generally]
## Detection Methods
- Detection should focus on anomalous PowerShell command-line arguments, excessive network activity originating from unexpected processes, and commands related to credential harvesting or file enumeration.
- YARA rules targeting PowerShell code patterns specific to this functionality or artifact may be applicable.
## Mitigation Strategies
- Restrict or heavily audit PowerShell usage, especially for remote script block execution or execution from unusual directories.
- Implement robust endpoint detection and response (EDR) solutions capable of behavioral analysis of scripting engines.
- Apply the principle of least privilege.
## Related Tools/Techniques
- KimJongRAT (Original version)
- Other PowerShell-based malware, such as Empire or Nishang frameworks.