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Frida script to spawn a process and monitor Native API calls
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| import frida | |
| import sys | |
| def on_message(message, data): | |
| if message['type'] == 'send': | |
| print(message['payload']) | |
| elif message['type'] == 'error': | |
| print(message['stack']) | |
| else: | |
| print(message) | |
| pid = frida.spawn("C:\Temp\stage0.exe") | |
| session = frida.attach(pid) | |
| script = """ | |
| var pNtAllocateVirtualMemory = Module.findExportByName("ntdll.dll", 'NtAllocateVirtualMemory') | |
| Interceptor.attach(pNtAllocateVirtualMemory, { | |
| onEnter: function (args) { | |
| this.ProcessHandle = args[0]; | |
| this.BaseAddress = args[1]; | |
| this.ZeroBits = args[2]; | |
| this.RegionSize = args[3]; | |
| this.AllocationType = args[4]; | |
| this.Protect = args[5]; | |
| }, | |
| onLeave: function (args) { | |
| if(!(this.ProcessHandle == 0xffffffff || this.ProcessHandle == 0xffffffffffffffff)){ | |
| send("[-] I saw you call NtAllocateVirtualMemory"); | |
| send("Process Handle: " + this.ProcessHandle); | |
| send("BaseAddress: " + this.BaseAddress); | |
| send("ZeroBits: " + this.ZeroBits); | |
| send("RegionSize: " + this.RegionSize); | |
| send("AllocationType: " + this.AllocationType); | |
| send("Protect: " + this.Protect); | |
| } | |
| } | |
| }); | |
| var pNtWriteVirtualMemory = Module.findExportByName("ntdll.dll", 'NtWriteVirtualMemory') | |
| Interceptor.attach(pNtWriteVirtualMemory, { | |
| onEnter: function (args) { | |
| this.Handle = args[0]; | |
| this.BaseAddress = args[1]; | |
| this.Buffer = args[2]; | |
| this.NumberOfBytesToWrite = args[3]; | |
| this.NumberOfBytesWritten = args[4]; | |
| }, | |
| onLeave: function (args) { | |
| if(!(this.Handle == 0xffffffff)){ | |
| send("[-] I saw you call NtWriteVirtualMemory"); | |
| send("Handle: " + this.Handle); | |
| send("BaseAddress: " + this.BaseAddress); | |
| send("Buffer: " + this.Buffer); | |
| send("NumberOfBytesToWrite: " + this.NumberOfBytesToWrite); | |
| send("NumberOfBytesWritten: " + this.NumberOfBytesWritten); | |
| } | |
| } | |
| }); | |
| """ | |
| script = session.create_script(script) | |
| frida.resume(pid) | |
| script.on('message', on_message) | |
| script.load() | |
| try: | |
| while True: | |
| pass | |
| except KeyboardInterrupt: | |
| session.detach() | |
| sys.exit(0) |
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