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TROJ_DOFOIL.AA

April 14, 2011
 Analysis by: Roland Dela Paz
 ALIASES:

Downloader (Symantec); TrojanDownloader:Win32/Dofoil.D (Microsoft)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan arrives as attachment to mass-mailed email messages.

It bears the file icons of certain applications to avoid easy detection and consequent removal. It deletes itself after execution.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

30,296 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

10 Apr 2011

Payload:

Compromises system security, Connects to URLs/Ips

Arrival Details

This Trojan arrives as attachment to mass-mailed email messages.

Installation

This Trojan bears the file icons of the following applications:

  • Microsoft Word Document

It deletes itself after execution.

Other Details

This Trojan connects to the following website to send and receive information:

  • {BLOCKED}1.{BLOCKED}9.75.77
  • {BLOCKED}1.{BLOCKED}9.75.14

  SOLUTION

Minimum Scan Engine:

8.900

FIRST VSAPI PATTERN FILE:

7.964.03

FIRST VSAPI PATTERN DATE:

11 Apr 2011

Step 1

For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Scan your computer with your Trend Micro product and note files detected as TROJ_DOFOIL.AA

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete the file detected as TROJ_DOFOIL.AA

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 5

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