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You have been re-routed to the TrojanSpy:Win32/Nivdort.G write up because TrojanSpy%3aWin32%2fNivdort.G has been renamed to TrojanSpy:Win32/Nivdort.G
 

TrojanSpy:Win32/Nivdort.G


TrojanSpy:Win32/Nivdort.G is a trojan that collects sensitive information for an attacker.


What to do now

To detect and remove this threat and other malicious software that may have been installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following: For more information about using antivirus software, see http://www.microsoft.com/windows/antivirus-partners/.

Additional remediation instructions

This threat may make lasting changes to an affected system's configuration that will NOT be restored by detecting and removing this threat. For more information on returning an affected system to its pre-infected state, please see the following information:
To recreate a clean Hosts file:
See How do I reset the Hosts file back to the default?

Threat behavior

TrojanSpy:Win32/Nivdort.G is a trojan that collects sensitive information for an attacker.
Installation
When executed, TrojanSpy:Win32/Nivdort.G copies itself to the following locations:

  • <system folder>\sdfbtdlyqb.exe
  • <system folder>\spcclfrzm.exe
  • c:\documents and settings\administrator\local settings\temp\htmzqf6d2yzr6krh9k2.exe

Note: <system folder> refers to a variable location that is determined by the malware by querying the Operating System. The default installation location for the System folder for Windows 2000 and NT is C:\Winnt\System32; and for XP, Vista, and 7 is C:\Windows\System32.

The malware modifies the following registry entries to ensure that its copy executes at each Windows start:

Adds value: "File Image Instrumentation RPC Enumerator"
With data: "c:\windows\system32\spcclfrzm.exe"
To subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

The malware creates the following files on an affected computer:

  • %windir%\temp\htmzqf6tlkzb.exe
  • <system folder>\rgywyyj\cfg
  • <system folder>\rgywyyj\etc
  • <system folder>\rgywyyj\rng
  • <system folder>\rgywyyj\run
  • <system folder>\rgywyyj\tst
Payload
Modifies Hosts file
TrojanSpy:Win32/Nivdort.G modifies the Windows Hosts file. The local Hosts file overrides the DNS resolution of a website URL to a particular IP address. Malicious software may make modifications to the Hosts file in order to redirect specified URLs to different IP addresses. Malware often modifies an affected computer's Hosts file in order to stop users from accessing websites associated with particular security-related applications (such as antivirus for example).

Modifies system security settings
The malware may attempt to disable Firewall notifications from the Windows Security Center by making the following registry modification:

Adds value: "FirewallDisableNotify"
With data: "1"
To subkey: HKLM\SOFTWARE\Microsoft\Security Center

Contacts remote hosts
The malware may contact the following remote hosts using port 80:

  • advantcedmtleaps.com
  • bluewateronredmoon.com
  • bluewateronredmoon.net
  • checkersdolist.com
  • checkersdolist.net
  • coktynertosar.com
  • dewerbatten.com
  • dewerbatten.net
  • hindmanblog.com
  • hindmanblog.net
  • jomerryta.com
  • marionhousestoday.com
  • meteringintheway.com
  • oanazavomurates.com
  • peachpersonals.com
  • trafatelist.com
  • trafatelist.net
  • trafatelost.com
  • trafatelost.net
  • trs-central.com
  • trs-central.net

Commonly, malware may contact a remote host for the following purposes:
  • To confirm Internet connectivity
  • To report a new infection to its author
  • To receive configuration or other data
  • To download and execute arbitrary files (including updates or additional malware)
  • To receive instruction from a remote attacker
  • To upload data taken from the affected computer

This malware description was produced and published using our automated analysis system's examination of file SHA1 705dd9431312373e9353c33ebf2fb737c5c6ec1f.

Symptoms

System changes
The following system changes may indicate the presence of this malware:

  • The presence of the following files:

  • %windir%\temp\htmzqf6tlkzb.exe
    <system folder>\sdfbtdlyqb.exe
    <system folder>\spcclfrzm.exe
    <system folder>\rgywyyj\cfg
    <system folder>\rgywyyj\etc
    <system folder>\rgywyyj\rng
    <system folder>\rgywyyj\run
    <system folder>\rgywyyj\tst
    c:\documents and settings\administrator\local settings\temp\htmzqf6d2yzr6krh9k2.exe

  • The presence of the following registry modifications:
  • Adds value: "File Image Instrumentation RPC Enumerator"
    With data: "c:\windows\system32\spcclfrzm.exe"
    To subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    Adds value: "FirewallDisableNotify"
    With data: "1"
    To subkey: HKLM\SOFTWARE\Microsoft\Security Center


Prevention

Take the following steps to help prevent infection on your computer:
  • Enable a firewall on your computer.
  • Get the latest computer updates for all your installed software.
  • Use up-to-date antivirus software.
  • Limit user privileges on the computer.
  • Use caution when opening attachments and accepting file transfers.
  • Use caution when clicking on links to webpages.
  • Avoid downloading pirated software.
  • Protect yourself against social engineering attacks.
  • Use strong passwords.
Enable a firewall on your computer

Use a third-party firewall product or turn on the Microsoft Windows Internet Connection Firewall.

Get the latest computer updates

Updates help protect your computer from viruses, worms, and other threats as they are discovered. It is important to install updates for all the software that is installed in your computer. These are usually available from vendor websites. Instructions on how to download the latest versions of some common software is available from the following:

You can use the Automatic Updates feature in Windows to automatically download future Microsoft security updates while your computer is on and connected to the Internet.

Use up-to-date antivirus software

Most antivirus software can detect and prevent infection by known malicious software. To help protect you from infection, you should always run antivirus software, such as Microsoft Security Essentials, that is updated with the latest signature files. For more information, see http://www.microsoft.com/windows/antivirus-partners/.

Limit user privileges on the computer

Starting with Windows Vista and Windows 7, Microsoft introduced User Account Control (UAC), which, when enabled, allowed users to run with least user privileges. This scenario limits the possibility of attacks by malware and other threats that require administrative privileges to run.

You can configure UAC in your computer to meet your preferences:

Use caution when opening attachments and accepting file transfers

Exercise caution with email and attachments received from unknown sources, or received unexpectedly from known sources. Use extreme caution when accepting file transfers from known or unknown sources.

Use caution when clicking on links to webpages

Exercise caution with links to webpages that you receive from unknown sources, especially if the links are to a webpage that you are not familiar with, unsure of the destination of, or suspicious of. Malicious software may be installed in your computer simply by visiting a webpage with harmful content.

Avoid downloading pirated software

Threats may also be bundled with software and files that are available for download on various torrent sites. Downloading "cracked" or "pirated" software from these sites carries not only the risk of being infected with malware, but is also illegal. For more information, see 'The risks of obtaining and using pirated software'.

Protect yourself from social engineering attacks

While attackers may attempt to exploit vulnerabilities in hardware or software to compromise a computer, they also attempt to exploit vulnerabilities in human behavior to do the same. When an attacker attempts to take advantage of human behavior to persuade the affected user to perform an action of the attacker's choice, it is known as 'social engineering'. Essentially, social engineering is an attack against the human interface of the targeted computer. For more information, see 'What is social engineering?'.

Use strong passwords

Attackers may try to gain access to your Windows account by guessing your password. It is therefore important that you use a strong password – one that cannot be easily guessed by an attacker. A strong password is one that has at least eight characters, and combines letters, numbers, and symbols. For more information, see http://www.microsoft.com/protect/yourself/password/create.mspx.


Alert level: Severe
First detected by definition: 1.149.1846.0
Latest detected by definition: 1.179.560.0 and higher
First detected on: May 13, 2013
This entry was first published on: May 15, 2013
This entry was updated on: Jun 11, 2013

This threat is also detected as:
  • Troj/Agent-AAHQ (Sophos)
  • Trojan.Bayrob!gen2 (Symantec)