TROJ_CLICKER.YWQ

May 26, 2014
 Analysis by: Vincent Martin Hermosura
 ALIASES:

Trojan:Win32/Dynamer!ac (Microsoft); RDN/Generic.dx!dbd (McAfee); Trojan-Clicker.Win32.SearchEngine.v (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Clicker.BFVL (AVG)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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 does not have any propagation routine.

It does not have any backdoor routine.

It does not drop any other file.

It does not have any downloading capability.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size:

171,520 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

22 May 2014

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.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Internet Explorer\Recovery

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Recovery\Active

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
TabProcGrowth = "0"

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Internet Explorer\Recovery
NoReopenLastSession = "1"

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Dropping Routine

This Trojan does not drop any other file.

Download Routine

This Trojan does not have any downloading capability.

Information Theft

This Trojan does not have any information-stealing capability.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.806.04

FIRST VSAPI PATTERN DATE:

21 Apr 2014

VSAPI OPR PATTERN File:

10.807.00

VSAPI OPR PATTERN Date:

21 Apr 2014

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

Delete this registry key

[ 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\Policies\Microsoft\Internet Explorer
    • Recovery
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Recovery
    • Active

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\Internet Explorer\Main
    • TabProcGrowth = "0"
  • In HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Recovery
    • NoReopenLastSession = "1"

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_CLICKER.YWQ. 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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