TROJ_FDOWN.A

September 30, 2013
 ALIASES:

Dialer:Win32/CashDial (Microsoft); Generic PUP.x!b2c. (McAfee); Dialer.Generic (Symantec); Backdoor.Win32.DSSdoor.a (Kaspersky); Adware.MyTool (Sunbelt); Trojan horse Dropper.Generic_c.ANV (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:

161,539 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

30 Sep 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:

  • setups
  • Gamble Online !
  • %Program Files%\fastdownload-jor

(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).)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
acocash = "%Program Files%\fastdownload-jor\fastdown.exe -auto"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\ALifestyle

HKEY_LOCAL_MACHINE\SOFTWARE\ALifestyle\
acocash

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\ALifestyle\
acocash
fastdownload-jor = "%Program Files%\fastdownload-jor\fastdown.exe"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\ginstall.dll
  • %Windows%\openme.exe
  • %System Root%\setups\jorg.exe
  • %System Root%\setups\openercas.exe
  • %Start Menu%\Programs\Gamble Online !\Win real Money !.lnk
  • %Desktop%\Win real Money !.lnk
  • %Program Files%\fastdownload-jor\fastdown.adl
  • %Start Menu%\Programs\fastdownload-jor.lnk
  • %User Profile%\Pbk\rasphone.pbk
  • %Program Files%\fastdownload-jor\fastdown.exe
  • %Desktop%\-.lnk

(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.. %Windows% is the Windows folder, which is usually C:\Windows.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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.. %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).. %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.)

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
    • ALifestyle
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ALifestyle
    • acocash

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • acocash = "%Program Files%\fastdownload-jor\fastdown.exe -auto"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ALifestyle\acocash
    • fastdownload-jor = "%Program Files%\fastdownload-jor\fastdown.exe"

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%\ginstall.dll
  • %Windows%\openme.exe
  • %System Root%\setups\jorg.exe
  • %System Root%\setups\openercas.exe
  • %Start Menu%\Programs\Gamble Online !\Win real Money !.lnk
  • %Desktop%\Win real Money !.lnk
  • %Program Files%\fastdownload-jor\fastdown.adl
  • %Start Menu%\Programs\fastdownload-jor.lnk
  • %User Profile%\Pbk\rasphone.pbk
  • %Program Files%\fastdownload-jor\fastdown.exe
  • %Desktop%\-.lnk

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.
  • setups
  • Gamble Online !
  • %Program Files%\fastdownload-jor

Step 7

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