Full Report
Cisco Talos detailed a new approach to reverse engineering that pairs local AI agents with traditional analysis tools like the VB6 disassembler vbdec. Instead of awkwardly bolting AI onto the software, vbdec exposes its parsed data through a live COM interface.
Analysis Summary
# Tool/Technique: Local Agentic Reverse Engineering (via vbdec COM integration)
## Overview
This technique involves exposing a traditional reverse engineering tool's internal data model as a live service (specifically via COM/ROT) to be consumed by local AI agents. Instead of embedding AI directly into the tool, the tool acts as a "data server," allowing an AI agent to programmatically query parsed structures (like P-code, headers, and object tables) to automate complex malware analysis tasks.
## Technical Details
- **Type:** Technique / Analysis Framework
- **Platform:** Windows (specifically targeting VB6 binaries)
- **Capabilities:** Live object model exposure, automated P-code analysis, remote scripting of GUI tools, and agentic workflow orchestration.
- **First Seen:** June 2024 (Talos Publication)
## MITRE ATT&CK Mapping
*Note: This tool is used for defense and analysis, but it interacts with techniques often used by malware.*
- **[TA0007 - Discovery]**
- [T1012 - Query Registry] (Used by the tool to find COM objects)
- [T1592.002 - Gather Victim Host Information: Software] (Tool identifies VB6 structures)
- **[TA0040 - Impact]**
- [T1497 - Virtualization/Sandbox Evasion] (Often the target of the analysis handled by this tool)
## Functionality
### Core Capabilities
- **Live COM Object Model:** Registers the central `CVBProject` and main GUI forms into the Windows Running Object Table (ROT) under monikers like `vbdec.vbp`.
- **Language Agnostic Scripting:** Allows any external script (Python, PowerShell, VBScript) to gain a reference to the running disassembler instance.
- **Structured Data Access:** Provides direct access to the parsed VB6 project graph, including forms, classes, modules, API declarations, and P-code bodies.
### Advanced Features
- **Operator Briefing System:** Uses a "contract" (markdown file) that instructs an AI agent on how to bind to the ROT and navigate the `vbdec` object model.
- **Agentic Automation:** Enables AI to perform "manual-style" analysis repeatedly, such as de-obfuscating strings or mapping control flows, without manual user intervention.
- **Persistence:** The disassembler functions as a persistent data server, avoiding the need to re-parse data across different analysis sessions.
## Indicators of Compromise
*This tool is an analysis utility; however, it is designed to analyze files with the following characteristics:*
- **File Names:** `vbdec.exe`, `vbdec_ai.zip` (Support package)
- **COM Monikers:** `vbdec.vbp`, `vbdec.frmMain`
- **Behavioral Indicators:** A process (vbdec) registering objects in the Windows Running Object Table (ROT) and accepting external script connections via COM.
## Associated Threat Actors
- This tool is used by **Malware Analysts** and **Security Researchers** (e.g., Cisco Talos) to combat authors of VB6-based malware.
## Detection Methods
- **Behavioral detection:** Monitor for unauthorized processes querying the Running Object Table (ROT) or attempting to bind to `vbdec` COM objects.
- **Signature-based:** Standard AV signatures for `vbdec.exe` (though typically flagged as "RiskWare" or "Tool" rather than malicious).
## Mitigation Strategies
- **Prevention:** Ensure reverse engineering tools are run in isolated analysis environments (VMs) to prevent potential exploitation of the COM interface by malicious scripts.
- **Hardening:** Disable "Remote Scripting" in `vbdec` options (Help → Options) when not actively using agentic workflows.
## Related Tools/Techniques
- **vbdec:** The primary VB6 disassembler utilized.
- **IDA Pro / Ghidra:** Traditional disassemblers that use similar IPC or Python scripting (though often less integrated with local agentic AI).
- **COM (Component Object Model):** The underlying Windows technology used for the live data interface.