WORM_OTOTI.AX


 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This worm 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:

332,356 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

26 Dec 2013

Arrival Details

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
D-Link Wireless G WUA-1340 = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
Broadcom Wireless Manager UI = "%User Profile%\My Pictures\bcmntray.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
ComAgent = "%Program Files%\Common Files\System\msadc\ComAgent.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\D-Link Wireless G WUA-1340
StubPath = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\D-Link Wireless G WUA-1340
Version = "12,1,7601,17714"

Other System Modifications

This worm deletes the following files:

  • %Program Files%\Adobe\Reader 10.0\Reader\Tracker\~ftvkypo.tmp
  • %Program Files%\Adobe\Reader 10.0\Reader\Tracker\Steam.exe
  • %Common Startup%\Steam.exe
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\~ybxotfo.tmp
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\Reader_sl.exe
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\admisapi\~zcoynqr.tmp
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\admisapi\AirGCFG.exe
  • %User Profile%\My Pictures\~twmkbpb.tmp
  • %User Profile%\My Pictures\bcmntray.exe
  • %Program Files%\Common Files\System\msadc\~uabosyp.tmp
  • %Program Files%\Common Files\System\msadc\ComAgent.exe
  • %Program Files%\Reference Assemblies\~ensuqrk.tmp
  • %Program Files%\Reference Assemblies\almon.exe
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\servsupp\~fepcetl.tmp
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\servsupp\AirGCFG.exe

(Note: %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).. %Common Startup% is the system's shared Startup folder, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.. %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.)

It adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\D-Link Wireless G WUA-1340

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = "0"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Adobe Reader Speed Launcher = "%Program Files%\Common Files\Microsoft Shared\MSInfo\Reader_sl.exe"

(Note: The default value data of the said registry entry is "%Program Files%\Adobe\Reader 8.0\Reader\Reader_sl.exe".)

Dropping Routine

This worm drops the following files:

  • %User Temp%\BingDesktop.exe
  • %User Temp%\AdobeARM.exe
  • %Program Files%\Adobe\Reader 10.0\Reader\Tracker\Steam.exe
  • %Common Startup%\Steam.exe
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\Reader_sl.exe
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\admisapi\AirGCFG.exe
  • %User Profile%\My Pictures\bcmntray.exe
  • %Program Files%\Common Files\System\msadc\ComAgent.exe
  • %Program Files%\Reference Assemblies\almon.exe
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\servsupp\AirGCFG.exe

(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).. %Common Startup% is the system's shared Startup folder, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.. %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.)

Other Details

This worm connects to the following possibly malicious URL:

  • http://update.{BLOCKED}y.com/version.txt
  • http://update.{BLOCKED}y.com/7b42f98915590da75f3166378c54cb0b
  • http://update.{BLOCKED}y.com/proto.exe

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\Microsoft\Windows\CurrentVersion
    • RunOnce
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
    • D-Link Wireless G WUA-1340

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
    • D-Link Wireless G WUA-1340 = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
    • Broadcom Wireless Manager UI = "%User Profile%\My Pictures\bcmntray.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • ComAgent = "%Program Files%\Common Files\System\msadc\ComAgent.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\D-Link Wireless G WUA-1340
    • StubPath = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\D-Link Wireless G WUA-1340
    • Version = "12,1,7601,17714"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
    • EnableFirewall = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
    • DoNotAllowExceptions = "0"

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • From: Adobe Reader Speed Launcher = "%Program Files%\Common Files\Microsoft Shared\MSInfo\Reader_sl.exe"
      To: Adobe Reader Speed Launcher = """%Program Files%\Adobe\Reader 8.0\Reader\Reader_sl.exe"""

Step 6

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%\BingDesktop.exe
  • %User Temp%\AdobeARM.exe
  • %Program Files%\Adobe\Reader 10.0\Reader\Tracker\Steam.exe
  • %Common Startup%\Steam.exe
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\Reader_sl.exe
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\admisapi\AirGCFG.exe
  • %User Profile%\My Pictures\bcmntray.exe
  • %Program Files%\Common Files\System\msadc\ComAgent.exe
  • %Program Files%\Reference Assemblies\almon.exe
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\servsupp\AirGCFG.exe

Step 7

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

  • %Program Files%\Adobe\Reader 10.0\Reader\Tracker\~ftvkypo.tmp
  • %Program Files%\Adobe\Reader 10.0\Reader\Tracker\Steam.exe
  • %Common Startup%\Steam.exe
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\~ybxotfo.tmp
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\Reader_sl.exe
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\admisapi\~zcoynqr.tmp
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\admisapi\AirGCFG.exe
  • %User Profile%\My Pictures\~twmkbpb.tmp
  • %User Profile%\My Pictures\bcmntray.exe
  • %Program Files%\Common Files\System\msadc\~uabosyp.tmp
  • %Program Files%\Common Files\System\msadc\ComAgent.exe
  • %Program Files%\Reference Assemblies\~ensuqrk.tmp
  • %Program Files%\Reference Assemblies\almon.exe
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\servsupp\~fepcetl.tmp
  • %Program Files%\Common Files\Microsoft Shared\web server extensions\40\servsupp\AirGCFG.exe


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