I tried running a full virus scan with Symantec and Avira
Using more than one anti-virus program is not advisable
. The primary concern with doing so is due to conflicts that can arise when they are running in real-time mode simultaneously
. However, even when one of them is disabled for use as a stand-alone scanner, it can affect the other. Anti-virus software components insert themselves into the operating systems core and using more than one can cause instability, crash your computer, slow performance and waste system resources
. When actively running in the background while connected to the Internet, they both may try to update their definition databases at the same time. As the programs compete for resources required to download the necessary files this often can result in sluggish system performance or unresponsive behavior.
Each anti-virus will often interpret the activity of the other as a virus and there is a greater chance of them alerting you to a "False Positive
". If one finds a virus and then the other also finds the same virus, both programs will be competing over exclusive rights on dealing with that virus. Each anti-virus will attempt to remove the offending file and quarantine it. If one finds and quarantines the file before the other one does, then you encounter the problem of both wanting to scan each other's zipped or archived files and each reporting the other's quarantined contents. This can lead to a repetitive cycle of endless alerts that continually warn you that a virus has been found when that is not the case.
Anti-virus scanners use virus definitions to check for viruses and these can include a fragment of the virus code which may be recognized by other anti-virus programs as the virus itself. Because of this, most anti-virus programs encrypt their definitions so that they do not trigger a false alarm when scanned by other security programs. Other vendors do not encrypt their definitions and they can trigger false alarms when detected by the resident anti-virus.
Keep in mind that dual installation
is not always possible because most of the newer anti-virus programs will detect the presence of others and may insist they be removed prior to download and installation of another. Nonetheless, to avoid these problems, use only one anti-virus solution
. Deciding which one to remove is your choice. Be aware that you may lose your subscription to that anti-virus program's virus definitions once you uninstall that software.
NAV has the ability to detect unknown viruses of various types using heuristic algorithms
known as Bloodhound Technology
. According to Symantec, files that are detected
or may not
be malicious. Symantec asks that you Submit Virus Samples
detected as Bloodhould.Exploit.213 to the Symantec Security Response Team.
Symantec's technology uses an expert system to analyze the cataloged behaviors and assess the likelihood of viral infection. Bloodhound is not the name of a virus, but a message displayed by NAV when it thinks it may have found a new virus
which is categorized as Exploit, Packed variants in their defintion files
. Heuristic analysis
is the ability of an anti-virus program to detect possible new variants of malware
before the vendor can get samples and update the program's definitions for detection. Heuristics uses non-specific detection methods to find new or unknown malware which allows the anti-virus to detect and stop if before doing any harm to your system. Heuristic scanning methods vary depending on the vendor. Some claim to allow emulation of the file's activities in a virtual sandbox. Others scan the file more intensively, searching line by line inspecting the code in a file to see if it contains virus-like characteristics. If the number of these characteristics/instructions exceeds a pre-defined threshold, the file is flagged as a possible virus
to using heuristics is that it is not as reliable as signature-based detection (blacklisting) and can potentially increase the chances that a non-malicious program is flagged as malicious. With heuristics, there is always a potential risk
for a "False Positive
" if virus detection technology (AutoProtect Settings) are set to High for Bloodhound and the heuristic analysis flags a file as suspicious
that contains no malware. You may want to Reset Bloodhound to default settings
and try scanning again.
NAV is doing its job when alerting to a Bloodhound exploit but from personal experience and testing, I have found some of these alerts to be a false positive. You need to investigate further if you continue to get them and follow Symantec's instructions for submitting samples.
Your Malwarebytes Anti-Malware log indicates you are using an outdated database version
. Please update it through the program's interface (preferable method
) or manually download the definition updates
and just double-click on mbam-rules.exe
to install. Then perform a new Quick Scan
in normal mode and check all items found for removal. Don't forgot to reboot afterwards. Failure to reboot normally
(not into safe mode) will prevent MBAM from removing all the malware. When done, click the Logs
tab and copy/paste the contents of the new report in your next reply.
Your database shows 1945. Last I checked it was 2013.
Mbam-rules.exe is not
updated daily. Another way to get the most current database definitions if you're having problems updating, is to install MBAM on a clean computer, launch the program, update through MBAM's interface, copy the definitions (rules.ref
) to a USB stick or CD and transfer that file to the infected machine. Copy rules.ref to the location indicated for your operating system. If you cannot see the folder, then you may have to Reconfigure Windows
to show it.
- XP: C:\Documents and Settings\All Users\Application Data\Malwarebytes\Malwarebytes' Anti-Malware
- Vista: C:\Documents and Settings\Users\All Users\Malwarebytes\Malwarebytes' Anti-Malware