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3 changed files with 7 additions and 7 deletions
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2
README.md
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@ -5,7 +5,7 @@ Pasticciotto is a virtual machine which can be used to obfuscate code. It was de
I wanted to experiment with VM obfuscation since it was a topic that caught my attention while reversing challenges for various CTFs. So, I decided to write one **from scratch** in order to understand better how instruction set architectures are implemented! I wanted to experiment with VM obfuscation since it was a topic that caught my attention while reversing challenges for various CTFs. So, I decided to write one **from scratch** in order to understand better how instruction set architectures are implemented!
The design and the implementation behind Pasticciotto are not state-of-the-art but hey, it works! :D The design and the implementation behind Pasticciotto are not state-of-the-art but hey, it works!
# Why "Pasticciotto"? # Why "Pasticciotto"?
In Italian, "Pasticciotto" has two meanings! In Italian, "Pasticciotto" has two meanings!

2
polictf/client/pasticciotto_client.cpp
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@ -105,7 +105,7 @@ int main(int argc, char *argv[]) {
unsigned char opcode_key[] = {0x48, 0x61, 0x76, 0x65, 0x46, 0x75, 0x6e, unsigned char opcode_key[] = {0x48, 0x61, 0x76, 0x65, 0x46, 0x75, 0x6e,
0x21, 0x50, 0x6f, 0x6c, 0x69, 0x43, 0x54, 0x21, 0x50, 0x6f, 0x6c, 0x69, 0x43, 0x54,
0x46, 0x32, 0x30, 0x31, 0x37, 0x21, 0x00}; 0x46, 0x32, 0x30, 0x31, 0x37, 0x21};
printf("%s", banner); printf("%s", banner);
printf("\nHmmm...\n"); printf("\nHmmm...\n");

10
vm/vm.cpp
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@ -10,7 +10,6 @@ void VM::encryptOpcodes(uint8_t *key) {
uint32_t i, j, tmp, keysize; uint32_t i, j, tmp, keysize;
keysize = strlen((char *)key); keysize = strlen((char *)key);
DBG_INFO(("Using key: %s\n", key));
/* /*
RC4 KSA! :-D RC4 KSA! :-D
*/ */
@ -540,7 +539,7 @@ bool VM::execDIVR(void) {
} }
bool VM::execSHLI(void) { bool VM::execSHLI(void) {
/* /*
SHLI R0, 0x2 | R0 << 2 DIVI R0, 0x2 | R0 /= 2
*/ */
uint8_t dst; uint8_t dst;
uint16_t src; uint16_t src;
@ -556,7 +555,7 @@ bool VM::execSHLI(void) {
} }
bool VM::execSHLR(void) { bool VM::execSHLR(void) {
/* /*
SHLR R0, R1 -> R0 << R1 SHLR R0, R1 -> R0 /= R1
*/ */
uint8_t dst; uint8_t dst;
uint8_t src; uint8_t src;
@ -572,7 +571,7 @@ bool VM::execSHLR(void) {
} }
bool VM::execSHRI(void) { bool VM::execSHRI(void) {
/* /*
SHRI R0, 0x2 | R0 >> 2 SHRI R0, 0x2 | R0 /= 2
*/ */
uint8_t dst; uint8_t dst;
uint16_t src; uint16_t src;
@ -588,7 +587,7 @@ bool VM::execSHRI(void) {
} }
bool VM::execSHRR(void) { bool VM::execSHRR(void) {
/* /*
SHRR R0, R1 -> R0 >> R1 SHRR R0, R1 -> R0 /= R1
*/ */
uint8_t dst; uint8_t dst;
uint8_t src; uint8_t src;
@ -898,6 +897,7 @@ void VM::run(void) {
DBG_ERROR(("LODR FAILED.\n")); DBG_ERROR(("LODR FAILED.\n"));
finished = true; finished = true;
} }
regs[IP] += LODR_SIZE;
} else if (opcode == OPS[STRI]) { } else if (opcode == OPS[STRI]) {
ret = execSTRI(); ret = execSTRI();
if (ret) { if (ret) {