Shellcode Analyzer & x86 Disassembler
Analyze raw shellcode directly in your browser. CyberNexus Decoder disassembles common x86 opcodes, identifies NOP sleds, register zeroing, CALL-POP position-independent code and Linux syscalls, and emulates the Shikata Ga Nai decoder loop to recover embedded C2 configuration.
Open the shellcode analyzer tool →How to use the shellcode analyzer
- Paste hex-encoded shellcode (e.g. \x90\x90...) or raw bytes.
- Run "Disassemble Shellcode" to decode instructions and patterns.
- For encoded payloads, run "Decrypt Shikata Ga Nai" to extract C2 config.
- Use the Hex Viewer and Entropy Map for deeper inspection.
Features
- Basic x86 disassembly of common shellcode opcodes.
- Detects NOP sleds, CALL-POP PIC, and Linux INT 0x80 syscalls.
- Shikata Ga Nai emulator recovers C2 IP and port.
- Entropy mapping and string extraction for binary payloads.
Frequently asked questions
How do I analyze shellcode online?
Paste the hex shellcode and run Disassemble Shellcode to view decoded instructions and identify common patterns like NOP sleds and syscalls.
Can it decode Shikata Ga Nai encoded shellcode?
Yes. The Decrypt Shikata Ga Nai operation emulates the polymorphic decoder loop to recover the plaintext payload and C2 configuration.