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WORM_DORKBOT.SME
Aliases: Mal/ZboCheMan-D (Sophos), Win32/Rodpicom.C worm (NOD32)
Malware type: Worm
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Encrypted: Yes
In the wild: Yes

Overview


Infection Channel: Propagates via instant messaging applications, Downloaded from the Internet, Dropped by other malware

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be downloaded by other malware/grayware from remote sites.

Technical Details


File size: varies
File type: EXE
Memory resident: Yes
Initial samples received date: 30 Apr 2013
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be downloaded by the following malware/grayware from remote sites:

  • BKDR_LIFTOH.DLF
  • WORM_DORKBOT.SMD

It may be downloaded from the following remote site(s):

  • http://{BLOCKED}e.com/dl/207669376/b3b53b9/168sh7e4a16.html
  • http://{BLOCKED}e.com/dl/207710970/f7f704a/00998re8g.html
  • http://{BLOCKED}e.com/dl/207739813/11b18e0/874wef89w4ef.html

Installation

This worm adds the following mutexes to ensure that only one of its copies runs at any one time:

  • {CLSID}

NOTES:

Once executed, it searches for the following processes if running in the system:

  • skype.exe
  • msmsgs.exe
  • msnmsgr.exe
  • qip.exe
  • googletalk.exe
  • digsby-app.exe

It sends the following shortened links to user's contacts found on the mentioned applications:

  • http://{BLOCKED}w.ly/ky40O
  • http://{BLOCKED}r.ly/9imj
  • http://{BLOCKED}t.ly/YhXcQX
  • http://{BLOCKED}s.gd/u7SkPM
  • http://{BLOCKED}o.gl/GU9nm
  • http://{BLOCKED}w.ly/kx0cr
  • http://{BLOCKED}r.ly/9ilb
  • http://{BLOCKED}o.gl/eAGRD
  • http://{BLOCKED}t.ly/ZvGTyS
  • http://{BLOCKED}s.gd/hYZqwG

The URL leads the user to a file uploaded in Mediafire. The file is possibly an updated copy of the malware.

However, the account where the file is uploaded is already suspended as of this writing.

Solution


Minimum scan engine: 9.300
VSAPI OPR Pattern Version: 9.889.00
VSAPI OPR Pattern Release Date: 30 Apr 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 that dropped/downloaded WORM_DORKBOT.SME

Step 3

Identify and terminate files detected as WORM_DORKBOT.SME

[ Learn more ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Scan your computer with your Trend Micro product to delete files detected as WORM_DORKBOT.SME. 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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Analysis By: Rhena Inocencio

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