Home Malware Programs Backdoors Backdoor:Win32/Losfondup.B

Backdoor:Win32/Losfondup.B

Posted: February 7, 2013

Threat Metric

Threat Level: 6/10
Infected PCs: 26
First Seen: February 7, 2013
OS(es) Affected: Windows

Backdoor:Win32/Losfondup.B is a backdoor Trojan that allows attackers to gain unauthorized remote access and control of an infected computer system, modifies user system and settings accounts, and inserts itself into running processes. When installed, Backdoor:Win32/Losfondup.B makes system changes by adding malicious files and modifying the Windows Registry. Backdoor:Win32/Losfondup.B will present a user account called 'Local Servlce'. Backdoor:Win32/Losfondup.B may be installed and executed by other malware threats. Backdoor:Win32/Losfondup.B registers itself as a legal component of the Windows system service 'SENS' (system even notification service) by making modifications to the registry entry. Backdoor:Win32/Losfondup.B also modifies the registry entries to assure that its modified version of the 'SENS' service is loaded at each Windows start-up. When the Windows system service SENS is started, Backdoor:Win32/Losfondup.B is launched instead of the original, genuine one. To disguise its existence, Backdoor:Win32/Losfondup.B also carries out the normal functions of the gneuine SENS service. To assure that the modified version of the 'SENS' service (and, therefore, Backdoor:Win32/Losfondup.B itself) is running instead of the legal one, Backdoor:Win32/Losfondup.B ends 'svchost.exe' and runs the commands, which launch the modified 'SENS' service.

Technical Details

File System Modifications

Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.

The following files were created in the system:



ac0e2cd7093d8303cd6d3c1b703be70c File name: ac0e2cd7093d8303cd6d3c1b703be70c
Size: 188.41 KB (188416 bytes)
MD5: ac0e2cd7093d8303cd6d3c1b703be70c
Detection count: 62
Group: Malware file
Last Updated: February 11, 2013
4251f8a819c7b2999724e177b72bdbff File name: 4251f8a819c7b2999724e177b72bdbff
Size: 689.06 KB (689068 bytes)
MD5: 4251f8a819c7b2999724e177b72bdbff
Detection count: 60
Group: Malware file
Last Updated: February 11, 2013
ylccvty.dll File name: ylccvty.dll
File type: Dynamic link library
Mime Type: unknown/dll
Group: Malware file
mnjetuwilon.dat File name: mnjetuwilon.dat
File type: Data file
Mime Type: unknown/dat
Group: Malware file
noliwutejnm.dat File name: noliwutejnm.dat
File type: Data file
Mime Type: unknown/dat
Group: Malware file
[startup folder]\widoexe.js File name: [startup folder]\widoexe.js
File type: JavaScript file
Mime Type: unknown/js
Group: Malware file
%ALLUSERSPROFILE%\Documents\[reverse malware file name].dat File name: %ALLUSERSPROFILE%\Documents\[reverse malware file name].dat
File type: Data file
Mime Type: unknown/dat
Group: Malware file

Registry Modifications

The following newly produced Registry Values are:

HKEY..\..\{Value}HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SENS "Start" = "0x02"HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\COMSysApp "Start" = "0x02"HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SENS\Parameters "ServiceDll" = "%AllUserProfile%\Application Data\[RANDOM NAME].dat"
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