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bypassing-anti-vm-and-sandbox-checks

Bypasses anti-VM and sandbox checks during analysis by locating the specific detection routines (artifact strings, timing, CPUID/hypervisor bit) and planning patches or environment hardening so the sample detonates. Activates for requests to bypass anti-VM checks, defeat sandbox detection, or make an evasive sample run for analysis.

The English summary is being prepared. Showing the original description.

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Files included (4)

  • SKILL.md2.9 KB
  • LICENSE340 B
  • references/api-reference.md1.2 KB
  • scripts/analyst.py2.5 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Bypassing Anti-VM and Sandbox Checks

When to Use

  • An evasive sample refuses to detonate under analysis and you need to locate and neutralize its anti-VM/sandbox checks (artifact strings, timing stalls, CPUID hypervisor bit, MAC/registry checks).
  • You are planning patches or environment hardening to force execution.

Do not use patching as a shortcut that changes malicious logic — patch only the evasion gate. Run only in an isolated, instrumented VM with snapshots.

Prerequisites

  • The sample and a debugger/disassembler on an isolated VM.

Safety & Handling

  • The sample executes during bypass work; use a disposable, snapshotted, network-controlled VM.

Workflow

Step 1: Locate the evasion checks

python scripts/analyst.py locate sample.bin

Reports offsets of anti-VM artifact strings, timing APIs (GetTickCount, rdtsc), CPUID usage, and environment-fingerprint APIs to point you at the detection routines.

Step 2: Plan the bypass

For each check decide the approach: patch the conditional jump after the check, hook/stub the API to return benign values, or harden the VM (rename adapters, patch registry, add fake processes).

Step 3: Apply and verify

Patch the gate (e.g., force the "not detected" branch) and confirm the sample proceeds past the check.

Step 4: Document

Record each check, its offset, and the bypass applied for reproducibility.

Validation

  • Each located check maps to a real detection primitive (string/timing/CPUID/API).
  • The patched/hooked gate provably lets execution continue.
  • Only the evasion gate is altered, not the payload logic.

Pitfalls

  • Multiple layered checks — bypassing one is not enough.
  • Timing checks needing instruction-accurate handling (rdtsc deltas).
  • Anti-tamper detecting the patch; prefer hooking returns over byte patches when fragile.

References

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