SINCE 2013
Before diving in, confirm you are indeed dealing with DeepSea. de4dot -d assembly.exe What to look for:
| Pitfall | Solution | |--------|----------| | Process crashes after unpack attempt | DeepSea v4 often checks for code modifications using hashed method bodies. Patch the hash check in the stub before dumping. | | Dumped assembly has no types | The obfuscator uses – types are stored in a custom table. Use Mono.Cecil to walk the metadata and reconstruct. | | Anti-tamper with callbacks | Set a breakpoint on Assembly.ModuleResolve and AppDomain.AssemblyLoad – these callbacks verify the dumped image’s checksum. NOP them out. | | String decryption requires runtime context | Run the unpacked assembly under a profiler (like Harmony ) to intercept and log all string decryption results. |
The most effective "paper-like" technical resources for this task include: 1. Tool-Based Unpacking (Industry Standard)
This is the hallmark of v4. It replaces linear logic with "spaghetti code," using switch statements and jump instructions that confuse static analysis tools.
Literal strings—such as API keys, SQL queries, or file paths—are encrypted and stored in a resource section. They are only decrypted at runtime using a hidden internal method.
: Literal strings are replaced by calls to a decryption method that typically uses a simple XOR or private key.
The unpacking process for DeepSea v4 can be broken into three phases:
Many DeepSea v4 samples use a multi-stage decryption:
Before diving in, confirm you are indeed dealing with DeepSea. de4dot -d assembly.exe What to look for:
| Pitfall | Solution | |--------|----------| | Process crashes after unpack attempt | DeepSea v4 often checks for code modifications using hashed method bodies. Patch the hash check in the stub before dumping. | | Dumped assembly has no types | The obfuscator uses – types are stored in a custom table. Use Mono.Cecil to walk the metadata and reconstruct. | | Anti-tamper with callbacks | Set a breakpoint on Assembly.ModuleResolve and AppDomain.AssemblyLoad – these callbacks verify the dumped image’s checksum. NOP them out. | | String decryption requires runtime context | Run the unpacked assembly under a profiler (like Harmony ) to intercept and log all string decryption results. |
The most effective "paper-like" technical resources for this task include: 1. Tool-Based Unpacking (Industry Standard)
This is the hallmark of v4. It replaces linear logic with "spaghetti code," using switch statements and jump instructions that confuse static analysis tools.
Literal strings—such as API keys, SQL queries, or file paths—are encrypted and stored in a resource section. They are only decrypted at runtime using a hidden internal method.
: Literal strings are replaced by calls to a decryption method that typically uses a simple XOR or private key.
The unpacking process for DeepSea v4 can be broken into three phases:
Many DeepSea v4 samples use a multi-stage decryption:
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E-Bülten’e kaydol deepsea obfuscator v4 unpack
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