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analyzing-java-jar-malware

Analyzes Java/JAR malware (such as Adwind/jRAT-class cross-platform RATs) by inventorying the archive, reading the manifest entry point, detecting obfuscators and string encryption, and flagging suspicious runtime, reflection, and networking class usage. Activates for requests to analyze a malicious JAR, inspect Java malware, or identify a Java RAT.

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查看安装方法

包含的文件(4)

  • SKILL.md2.9 KB
  • LICENSE340 B
  • references/api-reference.md1.3 KB
  • scripts/analyst.py3.6 KB

SKILL.md(原文)

安装前可以查看交给 AI 代理的指令内容。

Analyzing Java/JAR Malware

When to Use

  • You have a malicious or suspicious .jar (often a cross-platform RAT) and need to map its structure, entry point, obfuscation, and capability surface before decompiling.
  • You want to triage a Java payload without running the JVM.

Do not use java -jar to run it — that executes the malware. Treat the JAR as a ZIP and read its contents statically.

Prerequisites

  • The JAR file, read inertly. Optional: a Java decompiler (CFR, Procyon) for the next stage.

Safety & Handling

  • Read the archive statically; never launch the JVM on the sample. Defang any URLs found.

Workflow

Step 1: Inventory the archive and entry point

python scripts/analyst.py inspect sample.jar

Lists .class files, embedded resources/payloads (nested JARs, scripts, encrypted blobs), and reads META-INF/MANIFEST.MF for Main-Class/Premain-Class.

Step 2: Detect obfuscation and packers

Flags obfuscator fingerprints (Allatori, ProGuard, Zelix), single-character class/package names, and string-decryption indicators.

Step 3: Flag capability classes

Surface dangerous API usage in strings/constant pools: Runtime.exec/ProcessBuilder, java.lang.reflect, URLClassLoader, javax.crypto, java.net.Socket, registry/persistence helpers.

Step 4: Route to decompilation

Hand the key classes to a decompiler (CFR/Procyon) for source recovery; record IOCs.

Validation

  • The manifest entry point is read and reported.
  • Embedded payloads/nested archives are enumerated.
  • Capability flags are backed by concrete class/string evidence.

Pitfalls

  • String-encrypted samples where capability strings appear only after decryption.
  • Multi-stage droppers that unpack a second JAR at runtime.
  • Benign obfuscated commercial JARs — corroborate with capability and delivery context.

References

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