Threat Database Trojans Trojan.Zeroaccess.B

Trojan.Zeroaccess.B

By JubileeX in Trojans

Threat Scorecard

Ranking: 5,730
Threat Level: 20 % (Normal)
Infected Computers: 1,592
First Seen: January 5, 2012
Last Seen: September 19, 2023
OS(es) Affected: Windows

Trojan.Zeroaccess.B was first detected in December of 2011. According to ESG security researchers, this dangerous Trojan has the capacity to infect computer systems using the Windows operating system, ranging from computers using Windows 95 all the way to Windows Vista and unpatched versions of Windows 7. Like most Trojans, Trojan.Zeroaccess.B cannot spread by itself and will typically be delivered through a third party. The Trojan.Zeroaccess.B Trojan in particular has been associated with attack websites that take advantage of a Java vulnerability to infect their visitors. The main danger of Trojan.Zeroaccess.B is that Trojan.Zeroaccess.B is linked to an extremely dangerous rootkit which has several functions. The Trojan.Zeroaccess.B's rootkit can download malware onto the infected computer system, disable security software and open a backdoor access which criminals can use to take control of the victim's computer system. The Trojan.Zeroaccess.B Trojan is a variant of the ZeroAccess Trojan which has the capacity to attack 64 bit systems. In fact, on 32 bit operating systems, Trojan.Zeroaccess.B will behave identically to its predecessor.

How Trojan.Zeroaccess.B Attacks Your Computer System

When the victim first executes Trojan.Zeroaccess.B, Trojan.Zeroaccess.B will overwrite one of the driver files and replace it with Trojan.Zeroaccess.B's own malicious code. On a 64 bit operating system, Trojan.Zeroaccess.B will first need to create various folders in the 'assembly' directory. Trojan.Zeroaccess.B will then drop various files, including a malicious DLL file in the System directory. Once it has done this, Trojan.Zeroaccess.B makes dangerous changes to the Windows registry which allow Trojan.Zeroaccess.B to control the victim's computer system and alter how it starts up and how it authorizes and authenticates users and file processes. Once Trojan.Zeroaccess.B has finished its installation process, Trojan.Zeroaccess.B will use a peer-to-peer connection to download three malicious files onto the previously-created directory. Using these downloaded files, Trojan.Zeroaccess.B can connect to a remote server to request an additional malicious file. It can also check whether the csrss.exe file process is running in order to inject itself into the service.exe file process. If the previously-mentioned process is not running, Trojan.Zeroaccess.B will then use the common method of injecting itself into the svchost.exe process. The Trojan.Zeroaccess.B Trojan will then alter the way users log into Windows, creating a hidden file structure which prevents its removal through typical means.

File System Details

Trojan.Zeroaccess.B may create the following file(s):
# File Name Detections
1. %System%\consrv.dll
2. %Windir%\assembly\tmp
3. %Windir%\assembly\GAC_32
4. %Windir%\assembly\tmp\{1B372133-BFFA-4dba-9CCF-5474BED6A9F6}
5. %Windir%\assembly\GAC_64
6. %Windir%\assembly\U

Registry Details

Trojan.Zeroaccess.B may create the following registry entry or registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\SubSystems\"Windows" = "consrv:ConServerDllInitialization"

URLs

Trojan.Zeroaccess.B may call the following URLs:

.creditcable.info

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