Trojan.Zeroaccess.C

Posted: August 16, 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:	112

First Seen:	August 16, 2012
OS(es) Affected:	Windows

Trojan.Zeroaccess.C is an alternative of the ZeroAccess rootkit, also known as Max++ or Sirefef, that uses file-downloading attacks to install other PC threats, along with potentially stealing confidential information, altering web browser pages and infecting native Windows files. Because Trojan.Zeroaccess.C, like all variants of Sirefef, is a high-level threat that will attempt to avoid your attention while Trojan.Zeroaccess.C circumvents your PC security, SpywareRemove.com malware experts recommend that you trust anti-malware products to detect and delete Trojan.Zeroaccess.C when necessary. Notable casualties of a Trojan.Zeroaccess.C infection that isn't removed with sufficient alacrity include logins for e-mail accounts and bank accounts, as well as compromised web-browsing safety. Other than the relatively minor file changes that are required for Trojan.Zeroaccess.C to function, Trojan.Zeroaccess.C doesn't show symptoms of its attacks, despite their danger.

Trojan.Zeroaccess.C: Shedding Old Tricks for New Ones

Trojan.Zeroaccess.C is an innovative and somewhat risky update for ZeroAccess, in that Trojan.Zeroaccess.C abandons traditional rootkit-based attacks in lieu of a new NT File System exploit. This exploit uses the Extended Attributes feature of that file system to patch malicious code into the Windows services.exe file – permanently. The nature of Trojan.Zeroaccess.C's attack means that the only way to restore services.exe is to use a backup from a clean source (such as a Windows CD or DVD). Fortunately, Windows versions from Vista on up to Windows 7 do include a 'Restore previous versions' feature that will let you roll back to a clean version of a Trojan.Zeroaccess.C-infected file. Services.exe files that are infected by Trojan.Zeroaccess.C may be identified by their own labels such as Trojan.Zeroaccess!inf4.

Scanning files that exploit Extended Attributes maliciously requires some additional coding effort for anti-malware products – hence the purpose of this new feature for Trojan.Zeroaccess.C is an obvious defensive measure to prevent detection. However, many prominent brands of anti-malware programs are capable of detecting PC threats that exploit the EA and other NTFS-related features, and SpywareRemove.com malware researchers still recommend that you use anti-malware software as usual for removing Trojan.Zeroaccess.C as the latest variant of ZeroAccess (no longer a rootkit).

A Survey of All the Functions That Trojan.Zeroaccess.C Hasn't Abandoned

Although Trojan.Zeroaccess.C was quick to drop a function that wasn't working out for Trojan.Zeroaccess.C as intended, other features that are traditionally-observed as part of the ZeroAccess/Sirefef/Max++ package remain intact. SpywareRemove.com malware experts have delineated some of the most central attacks and side effects of Trojan.Zeroaccess.C attacks as follows:

Loss of account information associated with banks and e-mail accounts due to Trojan.Zeroaccess.C monitoring browser-submitted data with traditional spyware features (keylogging, screen captures, etc).
Altered web page content. Trojan.Zeroaccess.C may use this to redirect you to hostile sites, phish for additional information or block you from PC security domains.
Internet connectivity and firewall issues due to Trojan.Zeroaccess.C's backdoor capabilities, which allow unauthorized network traffic. Your data transfer speeds may drop for no obvious reason, and your Internet connection may even be disabled randomly.

Trojan.Zeroaccess.C is limited to attacking Windows PCs, but SpywareRemove.com malware analysts have noted Trojan.Zeroaccess.C's significant expertise within that specialty. Trojan.Zeroaccess.C will install different components for different versions of Windows and is capable of infecting even modern versions of that OS such as Windows 7.

Aliases

TR/Crypt.XPACK.Gen [AntiVir]Troj/ZAccess-KY [Sophos]Backdoor.Win32.ZAccess.cdsd [Kaspersky]Suspicious file [Panda]Generic30.CAC [AVG]W32/ZeroAccess.B!tr [Fortinet]Win32:Rootkit-gen [GData]Heur.Packed.Unknown [Comodo]Troj/ZAccess-EG [Sophos]Trojan-Ransom.Win32.PornoAsset.aqbx [Kaspersky]Win32:Rootkit-gen [Rtk] [Avast]Trojan.Zeroaccess.C [Symantec]

Use SpyHunter to Detect and Remove PC Threats

If you are concerned that malware or PC threats similar to Trojan.Zeroaccess.C may have infected your computer, we recommend you start an in-depth system scan with SpyHunter. SpyHunter is an advanced malware protection and remediation application that offers subscribers a comprehensive method for protecting PCs from malware, in addition to providing one-on-one technical support service.

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Why can't I open any program including SpyHunter? You may have a malware file running in memory that kills any programs that you try to launch on your PC. Tip: Download SpyHunter from a clean computer, copy it to a USB thumb drive, DVD or CD, then install it on the infected PC and run SpyHunter's malware scanner.

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:

%SystemDrive%\RECYCLER\S-1-5-21-1935655697-920026266-1177238915-1003\$040dd16f468ed44dbb41c704f3c0c144\n.

File name: n.
Size: 48.64 KB (48640 bytes)
MD5: 8d247eef3d376c16e489cd6ed46c9ac3
Detection count: 103
Path: %SystemDrive%\RECYCLER\S-1-5-21-1935655697-920026266-1177238915-1003\$040dd16f468ed44dbb41c704f3c0c144
Group: Malware file
Last Updated: May 8, 2013

malware.dll

File name: malware.dll
Size: 124.41 KB (124416 bytes)
MD5: 21ffd24b8074d7cffdf4cc339d1fa8fe
Detection count: 74
File type: Dynamic link library
Mime Type: unknown/dll
Group: Malware file

strikezIR1CF.dll

File name: strikezIR1CF.dll
Size: 110.08 KB (110080 bytes)
MD5: 2f80f51188dc9aea697868864d88925d
Detection count: 32
File type: Dynamic link library
Mime Type: unknown/dll
Group: Malware file

decry.tmp

File name: decry.tmp
Size: 108.54 KB (108544 bytes)
MD5: bffc3e2b7382d093fb7440cabbd7b1ba
Detection count: 26
File type: Temporary File
Mime Type: unknown/tmp
Group: Malware file

%UserProfile%\Local Settings\Application Data\[UUID]\@

File name: %UserProfile%\Local Settings\Application Data\[UUID]\@
Group: Malware file

%UserProfile%\Local Settings\Application Data\[UUID]\n

File name: %UserProfile%\Local Settings\Application Data\[UUID]\n
Group: Malware file

%UserProfile%\AppData\Local\[UUID]\@

File name: %UserProfile%\AppData\Local\[UUID]\@
Group: Malware file

%UserProfile%\AppData\Local\[UUID]\n

File name: %UserProfile%\AppData\Local\[UUID]\n
Group: Malware file

%Windir%\Installer\[UUID]\@

File name: %Windir%\Installer\[UUID]\@
Group: Malware file

%Windir%\Installer\[UUID]\n

File name: %Windir%\Installer\[UUID]\n
Group: Malware file

More files

Registry Modifications

The following newly produced Registry Values are:

HKEY..\..\{Value}HKEY_CLASSES_ROOT\CLSID\{F3130CDB-AA52-4C3A-AB32-85FFC23AF9C1}\InprocServer32\"@" = "%Windir%\Installer\[UUID]\n."HKEY_CLASSES_ROOT\CLSID\{42aedc87-2188-41fd-b9a3-0c966feabec1}\InprocServer32\"@" = "%UserProfile%\AppData\Local\[UUID]\n."HKEY_CLASSES_ROOT\CLSID\{42aedc87-2188-41fd-b9a3-0c966feabec1}\InprocServer32\"@" = "%UserProfile%\Local Settings\Application Data\[UUID]\n."