ALIASES:

TrojanDownloader:Win32/Renos.LX (Microsoft); Generic FakeAlert.ah (McAfee); Trojan.FakeAV!gen29 (Symantec); Packed.Win32.Katusha.o (Kaspersky); VirTool.Win32.Obfuscator.hg!b1 (v) (Sunbelt); Trojan.Generic.5561843 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 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: 200,192 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 29 Nov 2012

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:

  • {malware path and file name}.exe

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
KOO9RV9K4Z = "{malware path and file name}.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\KOO9RV9K4Z

HKEY_CURRENT_USER\Software\Microsoft\
MediaPlayer\Health\{DE511A78-0018-4725-8ACE-C42C5BAC5EC9}

HKEY_CURRENT_USER\Software\XML

It adds the following registry entries:

HKEY_CURRENT_USER\Software\KOO9RV9K4Z
VtuH = "xC7aKZ+O6wyPlq1krRM4sG7m2LFGsYtHjHOagBf10Uk/n4gL8s8xs9LeD5KQVh3/j+XFa0mnvQ=="

HKEY_CURRENT_USER\Software\KOO9RV9K4Z
VtuS = "{random characters}"

HKEY_CURRENT_USER\Software\KOO9RV9K4Z
VpiH = "1cdb88"

HKEY_CURRENT_USER\Software\KOO9RV9K4Z
VpiB = "5258de"

HKEY_CURRENT_USER\Software\KOO9RV9K4Z
Vpi0 = "1"

HKEY_CURRENT_USER\Software\KOO9RV9K4Z
Vpi0 = "2"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\advapi32.dll[MofResourceName] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\mssmbios.sys[MofResource] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ipnat.sys[IPNATMofResource] = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\Drivers\HTTP.sys[UlMofResource] = "{random characters}"

Dropping Routine

This Trojan drops the following files:

  • %Windows%\Tasks\{22116563-108C-42c0-A7CE-60161B75E508}.job

(Note: %Windows% is the Windows folder, which is usually C:\Windows.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}ore.com/borders.php
  • http://{BLOCKED}ore.com/TR/xhtml1/DTD/xhtml1-transitional.dtd

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.300

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

Restart in Safe Mode

[ Learn More ]

Step 3

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
    • KOO9RV9K4Z
  • In HKEY_CURRENT_USER\Software\Microsoft\MediaPlayer\Health
    • {DE511A78-0018-4725-8ACE-C42C5BAC5EC9}
  • In HKEY_CURRENT_USER\Software
    • XML

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
    • KOO9RV9K4Z = "{malware path and file name}.exe"
  • In HKEY_CURRENT_USER\Software\KOO9RV9K4Z
    • VtuH = "xC7aKZ+O6wyPlq1krRM4sG7m2LFGsYtHjHOagBf10Uk/n4gL8s8xs9LeD5KQVh3/j+XFa0mnvQ=="
  • In HKEY_CURRENT_USER\Software\KOO9RV9K4Z
    • VtuS = "{random characters}"
  • In HKEY_CURRENT_USER\Software\KOO9RV9K4Z
    • VpiH = "1cdb88"
  • In HKEY_CURRENT_USER\Software\KOO9RV9K4Z
    • VpiB = "5258de"
  • In HKEY_CURRENT_USER\Software\KOO9RV9K4Z
    • Vpi0 = "1"
  • In HKEY_CURRENT_USER\Software\KOO9RV9K4Z
    • Vpi0 = "2"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\advapi32.dll[MofResourceName] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\mssmbios.sys[MofResource] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\DRIVERS\ipnat.sys[IPNATMofResource] = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • %System%\Drivers\HTTP.sys[UlMofResource] = "{random characters}"

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.
  • %Windows%\Tasks\{22116563-108C-42c0-A7CE-60161B75E508}.job

Step 6

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