ALIASES:

Trojan:Win32/Rimod (Microsoft); [2.nsis]:RDN/Generic FakeAlert!df (McAfee); Trojan.Win32.FakeAV.ajng (Kaspersky); FraudTool.Win32.RogueSecurity (v) (Sunbelt); Trojan horse Generic21.AKKL (AVG)

 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: 612,106 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 13 Jul 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 creates the following folders:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nsw5.tmp
  • %Program Files%\AntiVira Av Full
  • %Program Files%\AntiVira Av Full\db
  • %Start Menu%\Programs\AntiVira Av Full

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %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.)

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
AntiVirvaAv = "%Program Files%\AntiVira Av Full\AntiViraAv.exe /tray"

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsl1.tmp
  • %User Temp%\nsw5.tmp

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

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\AntiVirvaAv

HKEY_CURRENT_USER\SOFTWARE\AntiVirvaAv

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
AntiVira Av Full

HKEY_LOCAL_MACHINE\SOFTWARE\AntiVira Av Full

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\AntiVirvaAv
Support = "members.customerse.com"

HKEY_CURRENT_USER\Software\AntiVirvaAv
Actcode = "d85tA54rO17HfvQec"

HKEY_CURRENT_USER\Software\AntiVirvaAv
Support = "members.customerse.com"

HKEY_CURRENT_USER\Software\AntiVirvaAv
EMail = "minhow@yahoo.com"

HKEY_CURRENT_USER\Software\AntiVirvaAv
Support1 = "four.mirroravdownload.com"

HKEY_LOCAL_MACHINE\SOFTWARE\AntiVirvaAv
EMail = "minhow@yahoo.com"

HKEY_LOCAL_MACHINE\SOFTWARE\AntiVirvaAv
Actcode = "d85tA54rO17HfvQec"

HKEY_LOCAL_MACHINE\SOFTWARE\AntiVirvaAv
Support1 = "four.mirroravdownload.com"

HKEY_CURRENT_USER\Software\AntiVirvaAv
ScanStart = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
AntiVira Av Full
DisplayName = "AntiVira Av Full"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
AntiVira Av Full
UninstallString = "%Program Files%\AntiVira Av Full\uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\AntiVira Av Full
Install_Dir = "%Program Files%\AntiVira Av Full"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
AntiVira Av Full
NoRepair = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\AntiVirvaAv
ScanStart = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
AntiVira Av Full
NoModify = "1"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\nsg3.tmp
  • %User Temp%\nsw5.tmp\exdll.dll
  • %User Temp%\nsw5.tmp\AccessControl.dll
  • %User Temp%\nsw5.tmp\inetc.dll
  • tmp.tmp
  • %Program Files%\AntiVira Av Full\AntiViraAv.exe
  • %Program Files%\AntiVira Av Full\readme.txt
  • %Program Files%\AntiVira Av Full\config.cfg
  • %Program Files%\AntiVira Av Full\license.txt
  • %Program Files%\AntiVira Av Full\uninstall.exe
  • %Start Menu%\Programs\AntiVira Av Full\Uninstall.lnk
  • %Start Menu%\Programs\AntiVira Av Full\AntiVira Av Full.lnk
  • %Start Menu%\AntiVira Av Full.lnk
  • %Desktop%\AntiVira Av Full.lnk
  • Db\DATA.S

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %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 Details

This Trojan connects to the following possibly malicious URL:

  • http://members.{BLOCKED}erse.com/activate.php?{random characters}
  • http://members.{BLOCKED}erse.com/downloads/common/script.s

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_LOCAL_MACHINE\SOFTWARE
    • AntiVirvaAv
  • In HKEY_CURRENT_USER\SOFTWARE
    • AntiVirvaAv
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • AntiVira Av Full
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • AntiVira Av Full

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
    • AntiVirvaAv = "%Program Files%\AntiVira Av Full\AntiViraAv.exe /tray"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\AntiVirvaAv
    • Support = "members.customerse.com"
  • In HKEY_CURRENT_USER\Software\AntiVirvaAv
    • Actcode = "d85tA54rO17HfvQec"
  • In HKEY_CURRENT_USER\Software\AntiVirvaAv
    • Support = "members.customerse.com"
  • In HKEY_CURRENT_USER\Software\AntiVirvaAv
    • EMail = "minhow@yahoo.com"
  • In HKEY_CURRENT_USER\Software\AntiVirvaAv
    • Support1 = "four.mirroravdownload.com"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\AntiVirvaAv
    • EMail = "minhow@yahoo.com"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\AntiVirvaAv
    • Actcode = "d85tA54rO17HfvQec"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\AntiVirvaAv
    • Support1 = "four.mirroravdownload.com"
  • In HKEY_CURRENT_USER\Software\AntiVirvaAv
    • ScanStart = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\AntiVira Av Full
    • DisplayName = "AntiVira Av Full"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\AntiVira Av Full
    • UninstallString = "%Program Files%\AntiVira Av Full\uninstall.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\AntiVira Av Full
    • Install_Dir = "%Program Files%\AntiVira Av Full"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\AntiVira Av Full
    • NoRepair = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\AntiVirvaAv
    • ScanStart = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\AntiVira Av Full
    • NoModify = "1"

Step 5

Search and delete these components

[ Learn More ]
There may be some components 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 Temp%\nsg3.tmp
  • %User Temp%\nsw5.tmp\exdll.dll
  • %User Temp%\nsw5.tmp\AccessControl.dll
  • %User Temp%\nsw5.tmp\inetc.dll
  • tmp.tmp
  • %Program Files%\AntiVira Av Full\AntiViraAv.exe
  • %Program Files%\AntiVira Av Full\readme.txt
  • %Program Files%\AntiVira Av Full\config.cfg
  • %Program Files%\AntiVira Av Full\license.txt
  • %Program Files%\AntiVira Av Full\uninstall.exe
  • %Start Menu%\Programs\AntiVira Av Full\Uninstall.lnk
  • %Start Menu%\Programs\AntiVira Av Full\AntiVira Av Full.lnk
  • %Start Menu%\AntiVira Av Full.lnk
  • %Desktop%\AntiVira Av Full.lnk
  • Db\DATA.S

Step 6

Search and delete these folders

[ 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.
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nsw5.tmp
  • %Program Files%\AntiVira Av Full
  • %Program Files%\AntiVira Av Full\db
  • %Start Menu%\Programs\AntiVira Av Full

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEAV.ZIK. 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 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\nsl1.tmp
  • %User Temp%\nsw5.tmp


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