TROJ_DELF.JIK

October 10, 2012
 ALIASES:

Trojan:Win32/Delflob.I (Microsoft); Downloader.a!bcj (McAfee); Downloader (Symantec); Trojan-Downloader.Win32.Peregar.wm (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.5275113 (FSecure)

 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:

338,944 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

20 Sep 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.

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{E45B12A3-3687-4CEB-B0F5-F2CF3B901C6C}

Dropping Routine

This Trojan drops the following files:

  • %Windows%\OIJHUIOLUJO
  • %Windows%\sofos32x.dll

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Close all opened browser windows

Step 3

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.
  • %Windows%\OIJHUIOLUJO
  • %Windows%\sofos32x.dll

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DELF.JIK. 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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