Modified by: Mark Joseph Manahan

ALIASES:

Rogue:Win32/FakeRean (Microsoft), FakeAlert-AntiVirusPro (McAfee), Win32/TrojanDownloader.FakeAlert.AJT trojan, Win32/TrojanDownloader.FakeAlert.AJT trojan (Eset)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: Varies
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 03 Aug 2009
Payload: Connects to URLs/IPs, Displays graphics/image

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %User Profile%\Application Data\svcst.exe
  • %User Profile%\Application Data\seres.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
mserv = "%User Profile%\Application Data\svcst.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
svchost = "%User Profile%\Application Data\svcst.exe"

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Download
CheckExeSignatures = "no"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Download
RunInvalidSignatures = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Associations
LowRiskFileTypes = "zip;.rar;.cab;.txt;.exe;.reg;.msi;.htm;.html;.gif;.bmp;.jpg;.avi;.mov;.mp3;.wav"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Associations
SaveZoneInformation = "1"

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}erdogalo.com/c1G0T5Sd8grz0Nt4a3Sm8Uf
  • http://{BLOCKED}sedumil.com/Rq1St0Om5w8fdc0XXl4LP3b8Lw
  • http://{BLOCKED}gertos.com/xqx1RH0n5rr8Az0Cn4c3KX8WRY
  • http://{BLOCKED}rdavaf.com/dgQ1h0d5zB8m0fJ4SJM3d8EUW
  • http://{BLOCKED}lionkab.com/qbp1A0zl5Is/8imf0AZb4zXL3pYj8Gt
  • http://{BLOCKED}leskohuj.com/dM1Jw0nkg5W8Krt0r4v3A8wHw
  • http://{BLOCKED}rdosubor.com/m1Fm0ljr5xL8w0rw4cE3STG8l
  • http://{BLOCKED}ukager.com/a1ow0V5EJ8u0IPG4uS3OV8lG
  • http://{BLOCKED}fertagol.com/pM1qF0dSO5eFb8gh0XF4h3BwW8uT

It saves the files it downloads using the following names:

  • %User Profile%\lizkavd.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

As of this writing, the said sites are inaccessible.

NOTES:

This Trojan displays a tooltip which contains the message below to supposedly alert users of an infection:

Your computer is infected!
Windows has detected spyware infection!
It is recomended to use special antispyware tools to pervent data loss.Windows will now download and install the most up-to-date antispyware for you.

Click here to protect your computer from spyware!

The message is displayed once the malware successfully downloaded %User Profile%\lizkavd.exe. This malware then run the said file when the message is clicked.

  SOLUTION

Minimum Scan Engine: 9.200
VSAPI OPR PATTERN File: 6.509.00
VSAPI OPR PATTERN Date: 06 Oct 2009

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as TROJ_FAKEAV.SMD

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. 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.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

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\Windows\CurrentVersion\Run
    • mserv = "%User Profile%\Application Data\svcst.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • svchost = "%User Profile%\Application Data\svcst.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download
    • CheckExeSignatures = "no"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download
    • RunInvalidSignatures = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations
    • LowRiskFileTypes = "zip;.rar;.cab;.txt;.exe;.reg;.msi;.htm;.html;.gif;.bmp;.jpg;.avi;.mov;.mp3;.wav"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations
    • SaveZoneInformation = "1"

Step 4

Search and delete these files

[ Learn More ]
There may be some 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\lizkavd.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.SMD 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.


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