Listing 1. Pseudocode for executing the decoded shellcode using FountainDecoder.

Function ExecuteShellcode() // Initialize FountainDecoder Set decoder = Initialize FountainDecoder WITH: - shellcodeSize - sliceSize -~seed // Receive encoded packets FOR EACH packet IN encodedPackets Call ReceivePacket(packet) END~FOR // Decode packets to reconstruct shellcode Set shellcode = Call Decode() // Allocate memory for shellcode Set funcAddr = Call VirtualAlloc WITH: - BaseAddress: NULL - Size: LENGTH(shellcode) - State: MEM_COMMIT - Protection: PAGE_EXECUTE_READWRITE // Copy decoded shellcode to allocated memory Call Marshal.Copy WITH: - Source: shellcode - Destination: funcAddr - Length: LENGTH(shellcode) // Initialize thread parameters Set hThread = NULL Set threadId = 0 Set pinfo = NULL // Create a thread to execute shellcode Set hThread = Call CreateThread WITH: - StartAddress: funcAddr - Parameter: pinfo - Flags: 0 - ThreadId: threadId // Wait for the thread to complete Call WaitForSingleObject WITH: - Handle: hThread - Timeout: INFINITE Return End Function