TROJ_FAKEAV.JKI

June 20, 2013
 Analysis by: Jennifer Gumban
 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:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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.

  TECHNICAL DETAILS

File Size:

700,416 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Jun 2013

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 adds the following folders:

  • %Start Menu%\Programs\SYSTEM DOCTOR 2014

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

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

  • %Application Data%\{random folder name}\WINDOWSSECURITYUPDATE.EXE
  • %Application Data%\{random folder name}\{random filename}.exe

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

It drops the following files:

  • %Application Data%\{random folder name}\{random filename}.lst
  • %Start Menu%\Programs\SYSTEM DOCTOR 2014\SYSTEM DOCTOR 2014.LNK
  • %Desktop%\SYSTEM DOCTOR 2014 SUPPORT.URL
  • %Start Menu%\Programs\SYSTEM DOCTOR 2014\SYSTEM DOCTOR 2014 SUPPORT.URL
  • %Desktop%\SYSTEM DOCTOR 2014.LNK

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
SD2014 = %Application Data%\{random folder name}\{random filename}.exe

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.29.179/api/dom/no_respond/

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.964.02

FIRST VSAPI PATTERN DATE:

06 Jun 2013

VSAPI OPR PATTERN File:

9.965.00

VSAPI OPR PATTERN Date:

07 Jun 2013

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

Scan your computer with your Trend Micro product and note files detected as TROJ_FAKEAV.JKI

Step 3

Restart in Safe Mode

[ Learn More ]

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\Windows\CurrentVersion\Run
    • SD2014 = "%Application Data%\{random folder name}\{random filename}.exe"

Step 5

Search and delete this file

[ 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.

  • %Application Data%\{random folder name}\WINDOWSSECURITYUPDATE.EXE
  • %Application Data%\{random folder name}\{random filename}.exe
  • %Application Data%\{random folder name}\{random filename}.lst
  • %Start Menu%\Programs\SYSTEM DOCTOR 2014\SYSTEM DOCTOR 2014.LNK
  • %Desktop%\SYSTEM DOCTOR 2014 SUPPORT.URL
  • %Start Menu%\Programs\SYSTEM DOCTOR 2014\SYSTEM DOCTOR 2014 SUPPORT.URL
  • %Desktop%\SYSTEM DOCTOR 2014.LNK

Step 6

Search and delete this folder

[ 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.

  • %Start Menu%\Programs\SYSTEM DOCTOR 2014

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEAV.JKI. 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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