libmwemu 0.25.1

x86 32/64bits and system internals emulator, for securely emulating malware and other stuff.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71

use crate::color;
use crate::emu::Emu;
use iced_x86::Instruction;

pub fn execute(emu: &mut Emu, ins: &Instruction, instruction_sz: usize, _rep_step: bool) -> bool {
    if emu.rep.is_some() {
        if emu.rep.unwrap() == 0 || emu.cfg.verbose >= 3 {
            emu.show_instruction(color!("LightCyan"), &crate::emu::decoded_instruction::DecodedInstruction::X86(*ins));
        }
    } else {
        emu.show_instruction(color!("LightCyan"), &crate::emu::decoded_instruction::DecodedInstruction::X86(*ins));
    }

    if emu.cfg.is_x64() {
        let val = match emu.maps.read_byte(emu.regs().rsi) {
            Some(v) => v,
            None => {
                log::trace!("cannot read memory on rsi");
                return false;
            }
        };
        if !emu.maps.write_byte(emu.regs().rdi, val) {
            static FIRST_OOB: std::sync::atomic::AtomicBool =
                std::sync::atomic::AtomicBool::new(false);
            let rdi = emu.regs().rdi;
            if (0x412000..=0x420000).contains(&rdi)
                && !FIRST_OOB.swap(true, std::sync::atomic::Ordering::Relaxed)
            {
                log::trace!(
                    "DEBUG first movsb OOB rdi=0x{:x} rsi=0x{:x} rcx=0x{:x} rip=0x{:x} pos={}",
                    rdi, emu.regs().rsi, emu.regs().rcx, emu.regs().rip, emu.pos,
                );
            }
            log::trace!("cannot write memoryh on rdi");
            return false;
        }

        if !emu.flag_df() {
            emu.regs_mut().rsi += 1;
            emu.regs_mut().rdi += 1;
        } else {
            emu.regs_mut().rsi -= 1;
            emu.regs_mut().rdi -= 1;
        }
    } else {
        let val = match emu.maps.read_byte(emu.regs().get_esi()) {
            Some(v) => v,
            None => {
                log::trace!("cannot read memory on esi");
                return false;
            }
        };
        if !emu.maps.write_byte(emu.regs().get_edi(), val) {
            log::trace!("cannot write memory on edi");
            return false;
        }

        if !emu.flag_df() {
            let esi = emu.regs().get_esi() + 1;
            let edi = emu.regs().get_edi() + 1;
            emu.regs_mut().set_esi(esi);
            emu.regs_mut().set_edi(edi);
        } else {
            let esi = emu.regs().get_esi() - 1;
            let edi = emu.regs().get_edi() - 1;
            emu.regs_mut().set_esi(esi);
            emu.regs_mut().set_edi(edi);
        }
    }
    true
}