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TROJ_DROPPER.OKB

June 25, 2013
 Analysis by: Sabrina Lei Sioting
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan executes downloaded files whose malicious routines are exhibited by the affected system.

  TECHNICAL DETAILS

File Size:

707,584 bytes

File Type:

PE

Memory Resident:

No

Initial Samples Received Date:

13 Jul 2010

Payload:

Downloads files, , Connects to URLs/Ips, Displays graphics/image

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Antimalware Doctor Inc
=

(Note: The default value data of the said registry entry is .)

HKEY_CURRENT_USER\Software\Antimalware Doctor Inc\
Antimalware Doctor
=

(Note: The default value data of the said registry entry is .)

HKEY_CURRENT_USER\Software\Antimalware Doctor Inc\
Antimalware Doctor
coid = 8ECA7AF392E7B5E74FDAFAF0408248C2

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}ype.in/lp/70714/appmodulesetup70714.exe

It executes downloaded files :

    whose malicious routines are exhibited by the affected system.

    Other Details

    This Trojan connects to the following possibly malicious URL:

    • http://s.{BLOCKED}e.in/inst.php?a=7071410005&b=USA&c=&d=10&e=V2luZG93cyBYUCAoNS4xLjI2MDApIFNlcnZpY2UgUGFjayAy&do=2
    • http://s.{BLOCKED}e.in/inst.php?a=7071410005&b=USA&c=&d=11&e=V2luZG93cyBYUCAoNS4xLjI2MDApIFNlcnZpY2UgUGFjayAy&do=2
    • http://{BLOCKED}e.in/load/load.php?a=7071410005&b=USA&c=8ECA7AF392E7B5E74FDAFAF0408248C2&d={event}&e=V2luZG93cyBYUCAoNS4xLjI2MDApIFNlcnZpY2UgUGFjayAy

      SOLUTION

    Minimum Scan Engine:

    8.900

    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

    Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPER.OKB. 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.

    Step 3

    Delete this registry key

    [ Learn More ]

    Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

    • In HKEY_CURRENT_USER\Software\
      • Antimalware Doctor Inc


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