BKDR_BRIBA.EVL

Posted: August 17, 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:	2/10
Infected PCs:	22

First Seen:	August 17, 2012
OS(es) Affected:	Windows

BKDR_BRIBA.EVL is a backdoor Trojan that connects to a (currently disabled) C&C server to download and execute other malicious files. Typical BKDR_BRIBA.EVL attacks involve its installation via a Trojan dropper, TROJ_MDROP.EVL, which is distributed by e-mail spam. Because the installation process for BKDR_BRIBA.EVL exploits Flash vulnerabilities, SpywareRemove.com malware researchers especially encourage potential victims of attacks to update Adobe Flash Player as required to close vulnerabilities that could be used to install BKDR_BRIBA.EVL and similar PC threats without any form of permission. If you do need to remove BKDR_BRIBA.EVL from your computer, BKDR_BRIBA.EVL's deletion should be undertaken by anti-malware software that's designed to delete Trojans like BKDR_BRIBA.EVL that will resist usual removal methods.

How BKDR_BRIBA.EVL Hitches a Ride on Flash to Your Doorstep

BKDR_BRIBA.EVL is installed by TROJ_MDROP.EVL, a Trojan dropper that may appear to be a Word document. However, in spite of its ostensible file type, TROJ_MDROP.EVL contains hidden SWF content that's designed to exploit the Flash vulnerability CVE-2012-1535. If you're using Flash Player versions older than 11.3.300.271 for Windows/OS X or 11.2.202.238 for Linux, your PC can be affected by TROJ_MDROP.EVL's attack, which installs BKDR_BRIBA.EVL without your permission. Besides keeping Flash updated, SpywareRemove.com malware analysts also note that Android platforms and platforms without Flash are safe from this means of BKDR_BRIBA.EVL installation.

BKDR_BRIBA.EVL and TROJ_MDROP.EVL are distributed through spam e-mail messages that include TROJ_MDROP.EVL as a file attachment. Although TROJ_MDROP.EVL can't install BKDR_BRIBA.EVL without, itself, being launched, typical spam attacks will attempt to mislead victims into believing that these file attachments are benign or harmless. Due to this continuance of e-mail attachment-related attacks, SpywareRemove.com malware researchers encourage you to use anti-malware tools to scan files before you download or open them.

The Half-Functional Nature of a BKDR_BRIBA.EVL Infection

BKDR_BRIBA.EVL, while definitively malicious due to its attempt to contact remote servers and download other files without any permission, isn't quite as harmful to your PC as BKDR_BRIBA.EVL might be under other circumstances. Current reports by SpywareRemove.com malware researchers note that BKDR_BRIBA.EVL's C&C server isn't functional, which is hopefully indicative of the authorities having shut down the BKDR_BRIBA.EVL operation before BKDR_BRIBA.EVL could become widely-distributed to vulnerable PCs.

However, future variants of BKDR_BRIBA.EVL are likely to use different servers, and BKDR_BRIBA.EVL infections should always be removed, regardless, as a matter of standardized PC safety. BKDR_BRIBA.EVL injects itself into other memory processes and may intervene with the accomplishment or stability of your PC until you delete BKDR_BRIBA.EVL with a suitable anti-malware application.

If you need to disable BKDR_BRIBA.EVL for its complete removal, SpywareRemove.com malware analysts have found booting Windows from a removable USB drive to be useful for dodging the startup methods of BKDR_BRIBA.EVL and similar Trojans. BKDR_BRIBA.EVL's aliases include Win32/Briba.AA Trojan, Trojan.Win32.Generic!BT, Gen:Variant.Barys.984, Backdoor:Win32/Briba.A, Backdoor.Briba, Backdoor.Win32.Briba, Mal/Behav-116 and W32/Briba.AA.

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:

%User Profile%\Application Data\taskman.dll

File name: %User Profile%\Application Data\taskman.dll
File type: Dynamic link library
Mime Type: unknown/dll
Group: Malware file

Registry Modifications

The following newly produced Registry Values are:

HKEY..\..\{Value}HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run rundll32.exe = "%User Profile%\Application Data\taskman.dll, start"