DeepSea v4 replaces every string literal with a call to a decryption method:
string s = Strings.Get(0x7A4B2C1D);
The Strings.Get method uses a global key and a runtime XOR cipher. To restore strings: deepsea obfuscator v4 unpack
After this step, your code should be readable. DeepSea v4 replaces every string literal with a
As of late 2025, there is no fully automated public unpacker for DeepSea v4 due to its runtime polymorphism. However, these community scripts cover ~70% of the work: The Strings
Always run these in an isolated environment.
| Pitfall | Solution |
|-------------|---------------|
| Process crashes when you attach x64dbg | Use SharpMonoInjector to load a managed debugger inside the process space. |
| Dumped file has no entry point | DeepSea v4 erases the .NET Directory entry. Use CFF Explorer to recalculate the ManagedNativeHeader. |
| Virtualized methods call the wrong target | The VM uses a jump table stored in the .data section. Dump the table at runtime using a memory scanner (look for repeated push instructions). |
| Strings decrypt to garbage | The decryption key may depend on the thread’s ExecutionContext. Simulate the exact call stack using Harmony hooks. |
DeepSea, like many packers, uses pushad at the start to save the register state and popad right before jumping to the OEP to restore it.