libmwemu 0.24.5

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

use crate::emu;
use crate::winapi::helper;
use crate::winapi::winapi32::kernel32::COUNT_READ;

pub fn ReadFile(emu: &mut emu::Emu) {
    let file_hndl = emu
        .maps
        .read_dword(emu.regs().get_esp())
        .expect("kernel32!ReadFile cannot read the file_hndl") as u64;
    let buff = emu
        .maps
        .read_dword(emu.regs().get_esp() + 4)
        .expect("kernel32!ReadFile cannot read the buff") as u64;
    let size = emu
        .maps
        .read_dword(emu.regs().get_esp() + 8)
        .expect("kernel32!ReadFile cannot read the size");
    let bytes_read = emu
        .maps
        .read_dword(emu.regs().get_esp() + 12)
        .expect("kernel32!ReadFile cannot read the bytes_read") as u64;
    let overlapped = emu
        .maps
        .read_dword(emu.regs().get_esp() + 16)
        .expect("kernel32!ReadFile cannot read the overlapped");

    let mut count = COUNT_READ.lock().unwrap();
    *count += 1;

    if size == 4 && *count == 1 {
        // probably reading the size
        emu.maps.write_dword(buff, 0x10);
    }

    if *count < 3 {
        // keep reading bytes
        emu.maps.write_dword(bytes_read, size);
        emu.maps.memset(buff, 0x90, size as usize);
        emu.regs_mut().rax = 1;
    } else {
        // try to force finishing reading and continue the malware logic
        emu.maps.write_dword(bytes_read, 0);
        emu.regs_mut().rax = 0;
    }

    //TODO: write some random bytes to the buffer
    //emu.maps.write_spaced_bytes(buff, "00 00 00 01".to_string());

    log_red!(
        emu,
        "kernel32!ReadFile hndl: 0x{:x} buff: 0x{:x} sz: {}",
        file_hndl,
        buff,
        size
    );

    if !helper::handler_exist(file_hndl) {
        log::trace!("\tinvalid handle.")
    }

    for _ in 0..5 {
        emu.stack_pop32(false);
    }
}