TROJ_DROPR.YHN

April 08, 2013
 Analysis by: Mark Joseph Manahan
 ALIASES:

Trojan:Win32/Ircbrute (Microsoft), Win32/IRCBot.NHY trojan (Eset), Trojan-Dropper.Win32.Injector.htru (Kaspersky)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

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:

97,792 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

20 Mar 2013

Payload:

Drops files

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 drops and executes the following files:

  • %User Temp%\{random}.exe - detected as TROJ_IRCBRUTE.YL

(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.)

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.798.06

FIRST VSAPI PATTERN DATE:

20 Mar 2013

VSAPI OPR PATTERN File:

9.799.00

VSAPI OPR PATTERN Date:

20 Mar 2013

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

Remove the malware/grayware file dropped/downloaded by TROJ_DROPR.YHN

    • TROJ_IRCBRUTE.YL

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPR.YHN. 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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