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TROJ_FAKEAV.XN

October 13, 2012
 ALIASES:

Rogue:Win32/FakeXPA (Microsoft); Generic Dropper.bw (McAfee); Packed.Generic.187 (Symantec); Trojan-Downloader.Win32.FraudLoad.vrnt (Kaspersky); FraudTool.Win32.AntiVirus360 (v) (Sunbelt)

 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:

1,267,712 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 Oct 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 creates the following folders:

  • %Start Menu%\Antivirus 2009

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

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer
UserSession = "396EFC54E3C9F91A36F7768BEAEFE7BA"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
AdvancedScanType = "1"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
FirstRunUrl = "{random characters}"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
AfterRegisterUrl = "{random characters}"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
TermsUrl = "http://{BLOCKED}sarium.com/terms.php"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
HelpURL = "http://{BLOCKED}sarium.com/help.php"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
BillingURL = "http://{BLOCKED}sarium.com/license.php?Email=%email%&AffiliateID=%aff%"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
TransactionKey = "XsHrUGEutblgVFNM"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
BillingRegURL = "http://{BLOCKED}sarium.com/order_xp.php?ver=%aff%"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
LastRun = "10/11/2012"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
InstallDate = "10/11/2012"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
pPath = "{malware path and file name}"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
pName = "Antivirus 2009"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
SecurityVector = "000000000000000000000000000000000000000000"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
Scans = "1"

HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\
Options
LastScan = "11.10.2012 23:10:41"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\OneMoreKey

HKEY_CURRENT_USER\Software\XP Antivirus

Dropping Routine

This Trojan drops the following files:

  • %System%\scui.cpl
  • %User Profile%\Quick Launch\Antivirus 2009.lnk
  • %Desktop%\Antivirus 2009.lnk
  • %Start Menu%\Antivirus 2009\Antivirus 2009.lnk
  • %Start Menu%\Antivirus 2009\Uninstall Antivirus 2009.lnk
  • %System%\ieupdates.exe.tmp

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %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.. %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}sarium.com/firstrun.php?{random characters}
  • http://{BLOCKED}downloadcenter.com/zsa09/zs880000.exe

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

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\396EFC54E3C9F91A36F7768BEAEFE7BA
    • Options

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer
    • UserSession = "396EFC54E3C9F91A36F7768BEAEFE7BA"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • AdvancedScanType = "1"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • FirstRunUrl = "{random characters}"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • AfterRegisterUrl = "{random characters}"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • TermsUrl = "http://{BLOCKED}sarium.com/terms.php"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • HelpURL = "http://{BLOCKED}sarium.com/help.php"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • BillingURL = "http://{BLOCKED}sarium.com/license.php?Email=%email%&AffiliateID=%aff%"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • TransactionKey = "XsHrUGEutblgVFNM"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • BillingRegURL = "http://{BLOCKED}sarium.com/order_xp.php?ver=%aff%"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • LastRun = "10/11/2012"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • InstallDate = "10/11/2012"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • pPath = "{malware path and file name}"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • pName = "Antivirus 2009"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • SecurityVector = "000000000000000000000000000000000000000000"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • Scans = "1"
  • In HKEY_CURRENT_USER\Software\396EFC54E3C9F91A36F7768BEAEFE7BA\Options
    • LastScan = "11.10.2012 23:10:41"

Step 4

Search and delete these files

[ 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.
  • %System%\scui.cpl
  • %User Profile%\Quick Launch\Antivirus 2009.lnk
  • %Desktop%\Antivirus 2009.lnk
  • %Start Menu%\Antivirus 2009\Antivirus 2009.lnk
  • %Start Menu%\Antivirus 2009\Uninstall Antivirus 2009.lnk
  • %System%\ieupdates.exe.tmp

Step 5

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%\Antivirus 2009

Step 6

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

Step 7

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software
    • OneMoreKey
  • In HKEY_CURRENT_USER\Software
    • XP Antivirus


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