S7SCEncrypt

This is some scripts I made while studying the Sektor7 courses. Nothing really fancy, it's just that they used scripts in Python 2.7 and I wanted to use Python 3.

Generally, the output can be on cli in C friendly format or on file in binary format because my main goal was obviously shellcode encryption.

Install

A virtualenv is recommended.

pip install -r requirements.txt

xorencrypt.py

Encrypt a text message from cli

python3 xorencrypt.py -k mysecretkey -m hello
{ 0x5, 0x1c, 0x1f, 0x9, 0xc };

Encrypt a file and output to stdout

python3 xorencrypt.py -k mysecretkey -i file.txt
{ 0x5, 0x1c, 0x1f, 0x9, 0xc, 0x78 };

Encrypt a file and output to file (binary)

python3 xorencrypt.py -k mysecretkey -i file.txt -o file.bin
Wrote 6 bytes

xxd file.bin
00000000: 051c 1f09 0c78                           .....x

aesencrypt.py

Encrypt a text message from cli

python3 aesencrypt.py -m hello
AES Key        : { 0x23, 0x28, 0xae, 0x93, 0x9c, 0x44, 0x1d, 0x36, 0x7b, 0xf5, 0xf1, 0x3b, 0x92, 0xde, 0xb0, 0xd8 };

AES payload    : { 0x8a, 0xe8, 0x20, 0x34, 0x7e, 0x40, 0x6f, 0x42, 0x89, 0x99, 0xa7, 0xb2, 0x1f, 0xd3, 0xfc, 0x4f };

AES payload len: 16

Encrypt a file and output to stdout

AES Key        : { 0x57, 0x6e, 0xde, 0xd1, 0xa4, 0x7a, 0x1d, 0xed, 0xf9, 0x1f, 0x8e, 0xaf, 0xfc, 0x73, 0x7b, 0x82 };

AES payload    : { 0xc2, 0xcd, 0xe4, 0x3d, 0x3b, 0x59, 0x2e, 0x5b, 0x52, 0xdd, 0xa4, 0x40, 0x24, 0x30, 0x7d, 0xdc };

AES payload len: 16

Encrypt a file and output to file (binary)

python3 aesencrypt.py -i file.txt -o file.bin
AES Key        : { 0x82, 0x99, 0x48, 0xfd, 0x2a, 0xf7, 0xba, 0xa9, 0x1, 0x3, 0x3f, 0x3b, 0x61, 0x13, 0xa5, 0xaf };
Wrote 16 bytes in file.bin

xxd file.bin
00000000: 109b 9acf decf 18e1 74c1 e925 099c 3a7a  ........t..%..:z

bin2hfile.py

Generate a C/C++ header file from a binary data file. Assuming you have created a file with aesencrypt.py which contains a shellcode, you can turn it into a formatted header file

python3 bin2hfile.py -i file.bin -o file.h -l 207376

where -i is the input file, -o is the header file you wish to create and -l is the length of the payload.

xorstr2hfile.py

Generate a C header file for XORed variables.

The output file will have the given XOR key as a C define, unsigned char for each variable and a size_t value for each XORed value length.

For example:

cat variables.txt 
valloc,VirtualAlloc
vprote,VirtualProtect
rmomem,RtlMoveMemory
ker32d,Kernel32.dll

python3 xorstr2hfile.py -k 's3cret!' -i variables.txt -o encstr.h
cat encstr.h 
#define XORKEY "s3cret!"

unsigned char valloc[] = { 0x25, 0x5a, 0x11, 0x6, 0x10, 0x15, 0x4d, 0x32, 0x5f, 0xf, 0x1d, 0x6 }
size_t valloc_len = 12;

unsigned char vprote[] = { 0x25, 0x5a, 0x11, 0x6, 0x10, 0x15, 0x4d, 0x23, 0x41, 0xc, 0x6, 0x0, 0x17, 0x55 }
size_t vprote_len = 14;

unsigned char rmomem[] = { 0x21, 0x47, 0xf, 0x3f, 0xa, 0x2, 0x44, 0x3e, 0x56, 0xe, 0x1d, 0x17, 0xd }
size_t rmomem_len = 13;

unsigned char ker32d[] = { 0x38, 0x56, 0x11, 0x1c, 0x0, 0x18, 0x12, 0x41, 0x1d, 0x7, 0x1e, 0x9 }
size_t ker32d_len = 12;