Loading ToolBench
MCP server for FlareVM malware analysis - Remote malware-analysis bridge to an isolated FlareVM
This server has 31 tools with highly domain-specific but inconsistently documented functionality. Most tools have basic descriptions and some have input schemas, but critical gaps emerge on closer inspection: (1) Many parameter descriptions are sparse or missing context about expected formats and constraints; (2) Output schemas are NOT documented anywhere, LLMs cannot predict what fields will be returned; (3) Tool names are reasonable (verb_noun pattern mostly holds), but several combine multiple concerns; (4) Error handling is not visible in the provided code, no guidance on recovery or retry logic; (5) Many tools lack enum constraints where they should have them (e.g., output_format could be stringified). The infrastructure is present (31 tools, prompts, resources, logging) but execution quality is mediocre. The flarevm-specific domain (malware analysis, SMB file transfer, monitoring) is well-chosen, but the tool interface is not optimized for agent reasoning.
Analyze a binary with CAPA for capability fingerprinting
Verify FlareVM connectivity and retrieve system information
Analyze a binary with DIE (Detect It Easy) for packer/compiler identification
Download a file from FlareVM to the Kali analyst host via SMB
Execute a PowerShell script on FlareVM and return output
Execute a sample with concurrent ProcMon, Regshot, and network monitoring
Start FakeNet-NG network sinkhole with generated or custom configuration
No output schemas documented. Tools like `list_processes`, `list_services`, `list_scheduled_tasks`, `persistence_audit`, `regshot_baseline`, `regshot_compare`, `injection_scan_all`, and `vm_state` lack any documented return structure. LLMs cannot predict what fields will be available or plan downstream tool calls. This violates the core pattern:tool requirement.
Parameter descriptions lack actionable constraints. E.g., `execute_powershell` accepts a `timeout` integer but does not document the valid range, default, or whether 0 means infinite. `procmon_start` takes a `filter` string with no description of filter syntax. `die_analyze` and `capa_analyze` both accept `output_format` enum but descriptions do not explain what each format contains or when to use each.
Inferred effective spec: 2025-06-18+.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | F | 48 | 2025-06-18+ | v2 |
Stop FakeNet-NG sinkhole and download captured traffic artifacts
Extract stacked and decoded strings from a binary using FLOSS
Spawn a process with Frida instrumentation attached
Connect to IDA Pro running on FlareVM via the IDA MCP guest service
System-wide code injection scan using Hollows Hunter and PE-sieve
List all running processes with details (PID, parent, command line, user)
Enumerate scheduled tasks configured on the system
Enumerate installed Windows services with state and startup type
Scan running processes or a dump for code injection and anomalies using PE-sieve
Generate comprehensive Windows persistence audit report (autorunsc + tasks + services + WMI)
Start ProcMon process monitoring
Stop ProcMon and save capture to a .pml file
Take a registry baseline snapshot for before/after comparison
Compare current registry state with the baseline and generate a report
Execute a full static triage workflow (DIE + FLOSS + CAPA + YARA) on a sample
Capture network traffic with tshark and save to PCAP file
Detect packer type and attempt automatic unpacking (UPX, etc.)
Upload a file from the Kali analyst host to FlareVM via SMB
Verify tool binaries against the integrity manifest and optionally record new hashes
List, create, or revert VM snapshots (hypervisor commands on analyst host)
Get the current VM state (clean/dirty) and list of detonations since last revert
Connect to WinDbg running on FlareVM via the WinDbg MCP guest service
Launch x64dbg GUI debugger in the interactive FlareVM session
Scan a file or directory with YARA rules
Error handling and recovery guidance are invisible. No tool description indicates what errors might occur, when they are retryable, or what the LLM should do next. E.g., `upload_file` might fail if the SMB connection is down, but the description gives no recovery hint. `vm_snapshot` might refuse a revert if the snapshot does not exist, but no error classification is visible.
Tool composition issues: `triage_full` appears to be a wrapper that orchestrates `die_analyze`, `floss_extract_strings`, `capa_analyze`, and `yara_scan`. This violates the single-responsibility pattern. Either the LLM should compose these separately (and each should document its output so the next can accept it as input), or `triage_full` should be the canonical path and the individual tools should be removed or documented as building blocks. Currently, LLM may waste reasoning cycles choosing between the individual tools and the composite.
Missing pagination/result limits. `list_processes`, `list_services`, `list_scheduled_tasks`, and `persistence_audit` return lists but the tool descriptions do not mention limit, offset, pagination, or how many items might be returned. On a system with thousands of processes or services, returning all results will blow the context window. The pattern:paginated-result pattern is violated.
Unclear dependencies between state-changing tools. `fakenet_start`, `procmon_start`, `regshot_baseline` are typically called in sequence, but no tool description hints at the expected workflow or prerequisites. E.g., `fakenet_stop` should fail if `fakenet_start` was never called, but no error description guides recovery.
Several tool names are vague or combine concerns: `injection_scan_all` (uses both Hollows Hunter and PE-sieve but name does not indicate this), `unpack_detect_and_try` (combines detection and unpacking, should split into detect_packer and attempt_unpack), `x64dbg_launch_gui` (launching is a UI affordance; should name it run_debugger_interactively or similar). Ambiguous names reduce LLM clarity.
Irreversible operations (`vm_snapshot` revert, `execute_powershell`, `frida_spawn`) lack confirmation or dry-run capability. An LLM instructed to 'revert to last snapshot' might accidentally wipe the analysis state. The pattern:confirmation-request is not implemented.
Tool name consistency: some tools use underscores in compound names (`die_analyze`, `floss_extract_strings`, `pe_sieve_scan`, `ida_proxy`, `windbg_proxy`) while others use different patterns. More importantly, several tool names do NOT start with an action verb: `regshot_baseline`, `regshot_compare`, `vm_snapshot`, `vm_state`, `x64dbg_launch_gui` would be clearer as `take_regshot_baseline`, `compare_regshot`, `create_vm_snapshot`, `get_vm_state`, `launch_debugger`.