TROJ_DLOADR.BRI

July 11, 2013
 Analysis by: Jimelle Monteser
 ALIASES:

Trojan-Downloader.Win32.Mas (Ikarus), TrojanDownloader:Win32/Mas.A (Microsoft)

 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:

  • 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:

22,528 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

10 Jul 2013

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 adds the following folders:

  • %Windows%\Speech
  • %Windows%\Speech\Crypto
  • %Windows%\Speech\DL

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

Dropping Routine

This Trojan drops the following files:

  • %Windows%\Speech\Crypto\insler.log
  • {malware path}\inLog.txt

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

Other Details

This Trojan attempts to access the following websites to download files, which are possibly malicious:

  • http://{BLOCKED}.{BLOCKED}.226.73/spoofer/dl/1.exe