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TROJ_COSSTA.EF

November 30, 2013
 Analysis by: Mark Joseph Manahan
 ALIASES:

Trojan.Win32.Cossta (Ikarus), probably a variant of Win32/VB.NTK trojan (Eset)

 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:

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

22,528 bytes

File Type:

EXE

Initial Samples Received Date:

14 Nov 2013

Arrival Details

This Trojan may be dropped by other malware.

Installation

This Trojan drops the following file(s)/component(s):

  • %User Startup%\Sysini.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

It creates the following folders:

  • %User Profile%\B0B2D6E3

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}o.{BLOCKED}/AHGjxG

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

  • {BLOCKED}.{BLOCKED}liveira.com.br
  • {BLOCKED}.{BLOCKED}ariaquake.com.br