Trojan.Sirefef.BV

Posted: March 19, 2012

Threat Metric

The Threat Meter is a malware assessment that SpywareRemove.com's research team is able to give every identifiable malware threat. Our Threat Meter includes several criteria based off of specific malware threats to value their severity, reach and volume. The Threat Meter is able to give you a numerical breakdown of each threat's initial Threat Level, Detection Count, Volume Count, Trend Path and Percentage Impact. The overall ranking of each threat in the Threat Meter is a basic breakdown of how all threats are ranked within our own extensive malware database. The scoring for each specific malware threat can be easily compared to other emerging threats to draw a contrast in its particular severity. The Threat Meter is a useful tool in the endeavor of seeking a solution to remove a threat or pursue additional analytical research for all types of computer users.

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:	9/10
Infected PCs:	23

First Seen:	March 19, 2012
Last Seen:	May 3, 2024
OS(es) Affected:	Windows

Trojan.Sirefef.BV is a Trojan that assists other Sirefef-related PC threats in attacks that reduce your security, enable criminal control over your computer and install additional types of hostile software (such as rogue anti-virus programs). SpywareRemove.com malware research team has noted a recent increase in Facebook-distributed links that contain Sirefef-based Trojans such as Trojan.Sirefef.BV, and recommend that you avoid clicking on Facebook links that are suspicious or recommend that you download anything unusual. Since Trojan.Sirefef.BV is usually just a small part of a multi-component infection that's capable of reinstalling Trojan.Sirefef.BV whenever it's necessary, you should combat a Trojan.Sirefef.BV infection by taking steps to disable all PC threats and then scanning your computer to delete Trojan.Sirefef.BV and related Sirefef-based PC threats all in one fell sweep.

Trojan.Sirefef.BV: the Trojan That Just Keeps On Coming Back to Haunt You

The Sirefef family that Trojan.Sirefef.BV is a part of has been around since 2010, with many of its members conducting browser hijack attacks or playing support for rogue AV products like Antivirus 2010 (for example, by installing that Antivirus 2010 without your consent or disabling security tools that could remove Trojan.Sirefef.BV). However, the surges in Trojan.Sirefef.BV attacks are much more recent, and your anti-malware software may be unable to deal with a Trojan.Sirefef.BV-related threat until you update its threat database. SpywareRemove.com malware analysts note that, if improperly or incompletely removed, Trojan.Sirefef.BV can be restored upon your next reboot.

Complete removal of Trojan.Sirefef.BV requires that you also remove related PC threats that can reinstall Trojan.Sirefef.BV. Associated PC threats can include Trojan:Win32/Sirefef.J (a simulated banner-clicker that's one part of a Pay-Per-Click scam), TrojanDropper:Win32/Sirefef.A!dll (a Trojan that installs a difficult-to-detect kernel rootkit), Trojan:Win64/Sirefef.D (a browser hijacker that redirects you to unwanted sites) and Trojan:WinNT/Sirefef.A (a rootkit that infects system processes and protects malicious files). SpywareRemove.com malware analysts recommend that you boot Windows from a removable device before you scan your PC and delete Trojan.Sirefef.BV, since anything less than the above solution may allow Sirefef-based PC threats to protect or reinstall Trojan.Sirefef.BV.

How to Tell When a Tiny Trojan.Sirefef.BV Begins Its Not-So-Small Attacks

Although the symptoms of a Trojan.Sirefef.BV infection can be fairly variable (due to the presence of different Sirefef components or different instructions from remote servers), common issues that SpywareRemove.com malware experts have linked Trojan.Sirefef.BV to include:

The presence of fake anti-virus scanners like Antivirus 2010, which creates pop-ups and inaccurate scanner results.
Browser hijacks that are used to conduct PPC (Pay-Per-Click) hoaxes with your computer's resources. You may be redirected to hostile sites, see unusual advertisements in your browser or experience a significant drop in your computer's performance.
Disabled sound.
Loss of Internet connectivity.

Because Trojan.Sirefef.BV and similar Sirefef Trojans are especially promoted in fraudulent Facebook links, SpywareRemove.com malware research team advises that you be very cautious about clicking unusual links on popular social network sites. You should keep anti-malware software available to thwart drive-by-downloads of Trojan.Sirefef.BV and its fellow Sirefef Trojans can also be considered a wise precaution.

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:

file.exe

File name: file.exe
Size: 83.45 KB (83456 bytes)
MD5: b10bad962f7140ec82d1a095c196c17e
Detection count: 99
File type: Executable File
Mime Type: unknown/exe
Group: Malware file
Last Updated: March 20, 2012

file.zip

File name: file.zip
Size: 2.33 KB (2339 bytes)
MD5: 7b1f3fbe91027cdb70de5252e85bdb06
Detection count: 90
Mime Type: unknown/zip
Group: Malware file
Last Updated: March 20, 2012

C:\TDSSKiller_Quarantine\06.02.2021_17.06.08\zasubsys0000\file0000\tsk0000.dta

File name: tsk0000.dta
Size: 53.24 KB (53248 bytes)
MD5: 6bf2039986af96d98e08824ac6c383fd
Detection count: 12
Mime Type: unknown/dta
Path: C:\TDSSKiller_Quarantine\06.02.2021_17.06.08\zasubsys0000\file0000\tsk0000.dta
Group: Malware file
Last Updated: May 3, 2024

%System%\drivers\[RANDOM CHARACTERS].sys

File name: %System%\drivers\[RANDOM CHARACTERS].sys
File type: System file
Mime Type: unknown/sys
Group: Malware file

%Temp%\[random]

File name: %Temp%\[random]
Group: Malware file

C:\WINDOWS\system32\[random name].dll

File name: C:\WINDOWS\system32\[random name].dll
File type: Dynamic link library
Mime Type: unknown/dll
Group: Malware file

More files

Registry Modifications

The following newly produced Registry Values are:

HKEY..\..\..\..{Subkeys}HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun "[random].exe"HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun "[random]"