Backdoor.Zemra
Posted: June 28, 2012
Threat Metric
The following fields listed on the Threat Meter containing a specific value, are explained in detail below:
Threat Level: The threat level scale goes from 1 to 10 where 10 is the highest level of severity and 1 is the lowest level of severity. Each specific level is relative to the threat's consistent assessed behaviors collected from SpyHunter's risk assessment model.
Detection Count: The collective number of confirmed and suspected cases of a particular malware threat. The detection count is calculated from infected PCs retrieved from diagnostic and scan log reports generated by SpyHunter.
Volume Count: Similar to the detection count, the Volume Count is specifically based on the number of confirmed and suspected threats infecting systems on a daily basis. High volume counts usually represent a popular threat but may or may not have infected a large number of systems. High detection count threats could lay dormant and have a low volume count. Criteria for Volume Count is relative to a daily detection count.
Trend Path: The Trend Path, utilizing an up arrow, down arrow or equal symbol, represents the level of recent movement of a particular threat. Up arrows represent an increase, down arrows represent a decline and the equal symbol represent no change to a threat's recent movement.
% Impact (Last 7 Days): This demonstrates a 7-day period change in the frequency of a malware threat infecting PCs. The percentage impact correlates directly to the current Trend Path to determine a rise or decline in the percentage.
Threat Level: | 2/10 |
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Infected PCs: | 24 |
First Seen: | June 28, 2012 |
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OS(es) Affected: | Windows |
Backdoor.Zemra is a Trojan that opens a back door to gain commands from the following remote command-and-control (C&C) server and drops more files onto the infected computer. Once executed, Backdoor.Zemra creates a few files on the compromised PC. Backdoor.Zemra modifies and deletes several files. Backdoor.Zemra creates several registry entries so that it can run automatically every time you start Windows. Backdoor.Zemra also creates the certain registry entry to involve itself in the list of programs authorized by the Windows firewall. Backdoor.Zemra creates the particular mutex 'Global\CLR_RESERVED_MUTEX_NAME' to assure that only one copy of itself is executed. Backdoor.Zemra transfers system information to a remote location that includes OS version, language and computer name.
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:%Program Files%\Common Files\lsmass.exe
File name: %Program Files%\Common Files\lsmass.exeFile type: Executable File
Mime Type: unknown/exe
Group: Malware file
%UserProfile%\Application Data\wscntfy.exe
File name: %UserProfile%\Application Data\wscntfy.exeFile type: Executable File
Mime Type: unknown/exe
Group: Malware file
%UserProfile%\Application Data\Microsoft\CryptnetUrlCahce\Content\[THREAT FILE NAME]
File name: %UserProfile%\Application Data\Microsoft\CryptnetUrlCahce\Content\[THREAT FILE NAME]Group: Malware file
%UserProfile%\Application Data\Microsoft\CryptnetUrlCache\MetaData\[THREAT FILE NAME]
File name: %UserProfile%\Application Data\Microsoft\CryptnetUrlCache\MetaData\[THREAT FILE NAME]Group: Malware file
Registry Modifications
HKEY..\..\{Value}HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"Windows-Audio Driver" = "%UserProfile%\Application Data\wscntfy.exe"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run\"Windows-Network Component" = "%Program Files%\Common Files\lsmass.exe"HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile\AuthorizedApplications\List\"%UserProfile%\Application Data\wscntfy.exe" = "%UserProfile%\Application Data\wscntfy.exe:*:Enabled:Windows-Audio DriverHKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{CLSID}\"IsInstalled" = "1"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"Hidden" = "2"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system\"EnableLUA" = "0"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"EnableBalloonTips" = "0"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{CLSID}\"StubPath" = "%UserProfile%\Application Data\wscntfy.exe -r"
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