TROJ_FAKEAV.UUNE

October 09, 2012
 Analysis by: Karl Dominguez
 PLATFORM:

Windows 2000, XP, Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

This Trojan may be downloaded by other malware/grayware from remote sites.

It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.

It deletes the initially executed copy of itself.

It displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers. When users agree to buy the software, it connects to a certain URL.

  TECHNICAL DETAILS

File Size:

376,832 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

10 Jun 2011

Payload:

Connects to URLs/IPs, Display fake alerts

Arrival Details

This Trojan may be downloaded by the following malware/grayware from remote sites:

  • TROJ_FAKEAV.UUNF

It may be downloaded from the following remote sites:

  • http://{BLOCKED}also.org/404.php?type=stats&affid=525&subid=01&iruns

Installation

This Trojan drops the following non-malicious files:

  • %User Profile%\Application Data\~{malware file name}
  • %User Profile%\Application Data\{malware file name}{random}
  • %User Profile%\Application Data\{malware file name}
  • %User Profile%\Desktop\Windows XP Restore.lnk
  • %User Profile%\Start Menu\Programs\Windows XP Restore\Uninstall Windows XP Restore.lnk
  • %User Profile%\Start Menu\Programs\Windows XP Restore\Windows XP Restore.lnk

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It drops the following copies of itself into the affected system:

  • %User Profile%\Application Data\{random characters}.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It creates the following folders:

  • %User Profile%\Start Menu\Programs\Windows XP Restore

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Use FormSuggest = Yes

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
WarnOnZoneCrossing = 0

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
WarnonBadCertRecving = 0

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
CertificateRevocation = 0

Download Routine

This Trojan connects to the following malicious URLs:

  • http://{BLOCKED}attached.org/dfrg/dfrg
  • http://{BLOCKED}ant.org/dfrg/dfrg
  • http://{BLOCKED}also.org/dfrg/dfrg
  • http://{BLOCKED}behavior.org/dfrg/dfrg

Other Details

This Trojan deletes the initially executed copy of itself

Rogue Antivirus Routine

This Trojan displays the following fake alerts:

It displays fake alerts that warn users of infection. It also displays fake scanning results of the affected system. It then asks for users to purchase it once scanning is completed. If users decide to purchase the rogue product, users are directed to a certain website asking for sensitive information, such as credit card numbers.

When users agree to buy the software, it connects to the following URL to continue the purchase:

  • http://{BLOCKED}ant.org/customers/buy.php

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

8.212.09

FIRST VSAPI PATTERN DATE:

10 Jun 2011

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by TROJ_FAKEAV.UUNE

    TROJ_FAKEAV.UUNF

Step 3

Identify and terminate files detected as TROJ_FAKEAV.UUNE

[ Learn More ]
  1. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  2. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • Use FormSuggest = Yes
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • WarnOnZoneCrossing = 0
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • WarnonBadCertRecving = 0
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
    • CertificateRevocation = 0

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result. %User Profile%\Start Menu\Programs\Windows XP Restore

Step 6

Search and delete this file

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.  %User Profile%\Application Data\~{malware file name}
%User Profile%\Application Data\{malware file name}{random}
%User Profile%\Application Data\{malware file name}
%User Profile%\Desktop\Windows XP Restore.lnk

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.UUNE. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

NOTES:
Recommendations:

  • Enable Firewall to protect against web threats
  • Block malware related websites
  • Avoid visiting un-trusted sites that may redirect or download malware into the system
  • Be aware of social engineering attacks to be safe
  • Always keep pattern files/engine up-to-date


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