Avr+studio+419+hot

With an JTAGICE mkII, you can debug on actual hardware. AVR Studio 4.19 supports: breakpoints, single stepping, and variable watching over JTAG. Note: JTAGICE mkII requires legacy drivers and a physical COM port or USB-to-serial adapter.

Using AVR Studio 4.19 (running on Windows XP inside a forensic VM), we read the flash via ISP. The code was written in assembly/C mix.

Key code snippet (scam trigger routine):

SCAM_TRIGGER:
    sbi PORTB, SCAM_PIN   ; activate scam output
    call DELAY_5SEC
    call HEAT_LOOP        ; intentional warming
    cbi PORTB, SCAM_PIN
    ret
HEAT_LOOP:
ldi r16, 0xFF
out DDRB, r16         ; all outputs high
ldi r17, 0x00
heat_wait:
inc r17
brne heat_wait
ret
 avr+studio+419+hot

The HEAT_LOOP drives all I/O pins high, forcing excess current draw → thermal emission.

Criminals could remove HEAT_LOOP, but the scam logic alone (GSM + LCD) still produces a 41°C signature, detectable with high-end thermals. With an JTAGICE mkII, you can debug on actual hardware

After these steps, AVR Studio 4.19 will run without crashes.

AVR Studio 4.19 does not ship with a C compiler, but you can integrate WinAVR (GCC for AVR). WinAVR 20100110 is the last version compatible.

Once configured, you can write C code and debug in the same simulator – best of both worlds. Using AVR Studio 4

Example C code for the same blink:

#include <avr/io.h>
#include <util/delay.h>
int main(void) 
DDRB = 0xFF;
while (1) 
PORTB ^= 0xFF;
_delay_ms(500);