Analysis by: Jasen Sumalapao
ALIASES:

BackDoor-FFR (NAI), Trojan-Dropper.Win32.Dapato (Ikarus)

 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 may be unknowingly downloaded by a user while visiting malicious websites. It may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 116,160 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 08 Aug 2012

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

It may be dropped by the following malware:

  • TROJ_ARTIEF.OU

Installation

This Trojan drops the following component file(s):

  • %User Profile%\Application Data\servisce.exe - non malicious component
  • %User Profile%\Application Data\config.dll - detected as TROJ_DAPATO.EVL
  • %System%\lock.dat - non malicious component
  • %User Temp%\STREAM.SYS - non malicious component
  • %START MENU%\Programs\Startup\Update.lnk - non malicious component

(Note: %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.. %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 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.)

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • sixday.{BLOCKED}a.com

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.310.03
FIRST VSAPI PATTERN DATE: 08 Aug 2012
VSAPI OPR PATTERN File: 9.311.00
VSAPI OPR PATTERN Date: 09 Aug 2012

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

Remove malware/grayware files that dropped/downloaded TROJ_DAPATO.EVL

Step 3

Restart in Safe Mode

[ Learn More ]

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.
  • %User Profile%\Application Data\servisce.exe
  • %System%\lock.dat
  • %User Temp%\STREAM.SYS
  • %START MENU%\Programs\Startup\Update.lnk

Step 5

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