DNSChanger.bfr!96A741​34E1B6

This page shows details and results of our analysis on the malware DNSChanger.bfr!96A74134E1B6

Overview

This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.


Minimum DAT

7352 (2014-02-17)

Updated DAT

7352 (2014-02-17)

Minimum Engine

5600.1067

File Length

1161728

Description Added

2014-02-17

Description Modified

2014-02-17

Malware Proliferation

Characteristics

This is a Trojan

File PropertiesProperty Values
McAfee DetectionDNSChanger.bfr
Length1161728 bytes
MD596a74134e1b6b1b36e87bfcb1c03d94c
SHA12a31473df18ee03d00a48ffa465ab9668d89f95a


Other Common Detection Aliases

Company NamesDetection Names
EMSI SoftwareGen:Variant.Symmi.17712 (B)
avastWin32:Malware-gen
aviraTR/Crypt.XPACK.Gen
KasperskyPacked.Win32.Katusha.o
BitDefenderGen:Variant.Symmi.17712
Dr.WebTrojan.Rodricter.157
FortiNetW32/Simda.BC!tr
EsetWin32/Simda.B
normanFakeAV.CN!genr
pandaSuspicious file
risingPE:Malware.XPACK/RDM!5.1
SophosMal/Encpk-ADD
vba32BScope.Trojan.Simda.01718

Other brands and names may be claimed as the property of others.


ActivitiesRisk Levels
Attempts to modify the hosts file. This could be used to map hostnames different IP addresses redirecting traffic to an alternate location.High
Uses the Ipconfig commandMedium
Adds a component to or modifies the network stack.Medium
Enumerates many system files and directories.Low
Enumerates process listLow
Attempts to send data or commands via HTTPLow
Adds or modifies Internet Explorer cookiesLow
No digital signature is presentInformational


McAfee ScansScan Detections
McAfee BetaDNSChanger.bfr
McAfee SupportedDNSChanger.bfr



System Changes

Some path values have been replaced with environment variables as the exact location may vary with different configurations.
e.g.
%WINDIR% = \WINDOWS (Windows 9x/ME/XP/Vista/7), \WINNT (Windows NT/2000)
%PROGRAMFILES% = \Program Files


The following files were analyzed:

1A.tmp

The following files have been added to the system:

  • %TEMP%\2A31473DF18EE03D00A48FFA465AB9668D89F95A
  • %WINDIR%\SYSTEM32\drivers\etc\hosts.txt

The following files were temporarily written to disk then later removed:

  • %WINDIR%\SYSTEM32\drivers\etc\hosts
  • %TEMP%\11350.sys

The following registry elements have been changed:

  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\CONTROL\SESSION MANAGER\PENDINGFILERENAMEOPERATIONS = \??\%TEMP%\1A.tmp
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\EVENTLOG\APPLICATION\ESENT\CATEGORYCOUNT = 16
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\EVENTLOG\APPLICATION\ESENT\CATEGORYMESSAGEFILE = %WINDIR%\SYSTEM32\ESENT.dll
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\EVENTLOG\APPLICATION\ESENT\EVENTMESSAGEFILE = %WINDIR%\SYSTEM32\ESENT.dll
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\EVENTLOG\APPLICATION\ESENT\TYPESSUPPORTED = 7
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\TCPIP\PARAMETERS\INTERFACES\{2AE259D0-AEFC-43D6-A9A2-8742428A5DA1}\NAMESERVER = 94.242.222.66,8.8.8.8,[private subnet]

The applications attempted the following network connection(s):

  • 79.142.66.***:80
  • 5.149.248.**:80
  • hxxp://report.9a1kuo1oce1a9ku7m3g.com/
  • 204.79.197.***:80

Symptoms

This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

Method of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.

Removal

Please use the following instructions for all supported versions of Windows:


1. Disable Windows System Restore. For instructions, please refer to: http://www.mcafee.com/us/downloads/free-tools/disabling-system-restore.aspx

2. Update your McAfee Anti-Virus product to the latest version (when possible), and ensure the latest DAT and Engine and any applicable EXTRA.DATs are installed.

3. Run a full system scan. (On-Demand Scan)

4. Reboot, as soon as it is convenient, to ensure all malicious components are removed.

Variants