Trojan.Bisonal

Posted: January 19, 2017

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:	8/10
Infected PCs:	18

First Seen:	January 19, 2017
OS(es) Affected:	Windows

Trojan.Bisonal is a detection name used to describe a backdoor Trojan that is able to infect computers silently, and then provide the remote attacker with the ability to upload and execute files, exfiltrate data, execute remote commands, and receive real-time updates about the processes running on the victim's machine currently. Data of this type may allow the attackers to carry out very sophisticated attacks since it can tell them what sort of information they might be able to find on the infected machine. Furthermore, the ability to deploy additional threats to the victim's machine may give them the opportunity to utilize keyloggers, ransomware, and other threats that may cause a lot of trouble.

When Trojan.Bisonal infects a computer, it carries out several operations ensuring that the threat will persist through a restart and users will not be able to find and remove its files easily. The analyzed sample of Trojan.Bisonal makes the following changes to the victim's file system and Registry:

Creates a 'conhost.exe' file in the %TEMP% folder.
Creates a '\tasks\dfea.exe' file in the %Windir% folder.
Drops a randomly named '.XLS' file in the same directory as the payload.
Creates a Registry entry that launches 'dfea.exe' when Windows starts automatically.

In addition to the files and Registry entries, Trojan.Bisonal also establishes a communication channel with the domain hosting.myvnc.com. This connection may be used to exfiltrate data from the victim's machine via the FTP or HTTP protocol. Furthermore, this connection may be used to drop and execute files on the infected machine. Last but not least, Trojan.Bisonal is able to purge all of its components, therefore leaving the victim's machine clean after the attack has been carried out successfully.

The most efficient way to protect your computer from Trojan.Bisonal's attacks is to use a reputable anti-malware application that offers sufficient active and passive protection services. Furthermore, users are advised to avoid downloading content from unknown websites, as well as to be extra careful when downloading an e-mail attachment that they did not expect to receive. Infected e-mail attachments and fake downloads are two of the most popular methods to spread threats like Trojan.Bisonal, and following these two simple safe-browsing tips can help you steer away from many of the threatening applications that lurk on the World Wide Web.

Trojan.Bisonal

Threat Metric

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