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TROJ_DIALER.ZF

June 20, 2013
 ALIASES:

Dialer:Win32/Riprova (Microsoft); Dialer-gen. (McAfee); Dialer.Sfonditalia (Symantec); PAK:UPX, Trojan.Win32.Dialer.on (Kaspersky); Trojan-Dialer.Win32.MacEarny.gen (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:

15,176 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

11 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.

Other System Modifications

This Trojan deletes the following files:

  • %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log

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

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap\Domains\happyfile.net\
http://www

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap\Domains\otherchance.com\
http://www

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap\Domains\archiviosex.net\
http://www

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Internet Settings\
User Agent\Post Platform

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap\Domains\happyfile.net\
http://www
* = "2"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap\Domains\otherchance.com\
http://www
* = "2"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap\Domains\archiviosex.net\
http://www
* = "2"

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\2
Flags = "43"

(Note: The default value data of the said registry entry is 47.)

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "www.otherchance.com/?rid=599"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)

Dropping Routine

This Trojan drops the following files:

  • %Favorites%\exsplorer.lnk
  • %Favorites%\W1inMoviePlugIn.lnk
  • %Desktop%\exsplorer.lnk
  • %Desktop%\W1inMoviePlugIn.lnk
  • %User Profile%\Quick Launch\exsplorer.lnk
  • %User Profile%\Quick Launch\W1inMoviePlugIn.lnk
  • %User Profile%\My Documents\exsplorer.lnk
  • %User Profile%\My Documents\W1inMoviePlugIn.lnk
  • %Start Menu%\Programs\exsplorer.lnk
  • %Start Menu%\Programs\W1inMoviePlugIn.lnk
  • %Start Menu%\exsplorer.lnk
  • %Start Menu%\W1inMoviePlugIn.lnk

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

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\Internet Settings\ZoneMap\Domains\happyfile.net
    • http://www
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\otherchance.com
    • http://www
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\archiviosex.net
    • http://www
  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\User Agent
    • Post Platform

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\happyfile.net\http://www
    • * = "2"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\otherchance.com\http://www
    • * = "2"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\archiviosex.net\http://www
    • * = "2"

Step 4

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2
    • From: Flags = "43"
      To: Flags = ""47""
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • From: Start Page = "www.otherchance.com/?rid=599"
      To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""

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.
  • %Favorites%\exsplorer.lnk
  • %Favorites%\W1inMoviePlugIn.lnk
  • %Desktop%\exsplorer.lnk
  • %Desktop%\W1inMoviePlugIn.lnk
  • %User Profile%\Quick Launch\exsplorer.lnk
  • %User Profile%\Quick Launch\W1inMoviePlugIn.lnk
  • %User Profile%\My Documents\exsplorer.lnk
  • %User Profile%\My Documents\W1inMoviePlugIn.lnk
  • %Start Menu%\Programs\exsplorer.lnk
  • %Start Menu%\Programs\W1inMoviePlugIn.lnk
  • %Start Menu%\exsplorer.lnk
  • %Start Menu%\W1inMoviePlugIn.lnk

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_DIALER.ZF. 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 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.

  • %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log


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