Analysis by: Rhena Inocencio
ALIASES:

Trojan-Dropper.Win32.Sysn.ajmk (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:
 INFORMATION EXPOSURE:

  • 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.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 33,280 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 22 Aug 2014
Payload: Downloads 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 creates the following folders:

  • %System Root%\ProgramData

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

Download Routine

This Trojan accesses the following websites to download files:

  • https://dl.{BLOCKED}usercontent.com/s/{BLOCKED}p7r55qr1h206h/Flash_Players2.exe

It saves the files it downloads using the following names:

  • %System Root%\ProgramData\IndirilenDosya.exe - detected as TROJ_DROPPER.DND

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

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 11.102.03
FIRST VSAPI PATTERN DATE: 22 Aug 2014
VSAPI OPR PATTERN File: 11.103.00
VSAPI OPR PATTERN Date: 23 Aug 2014

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Remove malware/grayware files dropped/downloaded by TROJ_DLOADE.DND . (Note: Please skip this step if the threats listed below have already been removed.)

     
    • TROJ_DROPPER.DND

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADE.DND . 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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