Analysis by: Michael Cabel
 Modified by: Erika Bianca Mendoza
 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This worm may be downloaded by other malware/grayware/spyware from remote sites. It may be unknowingly downloaded by a user while visiting malicious websites.

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

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

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size: Varies
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 22 Feb 2011
Payload: Downloads files

Arrival Details

This worm may be downloaded by other malware/grayware/spyware from remote sites.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This worm drops the following copies of itself into the affected system:

  • %Windows%\ggdrive32.exe

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

It creates the following folders:

  • {removable drive}\RECYCLER

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
Microsoft Driver Setup = "%Windows%\ggdrive32.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Microsoft Driver Setup = "%Windows%\ggdrive32.exe"

Other System Modifications

This worm creates the following registry entry(ies) to bypass Windows Firewall:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{Malware Path and File Name} = "{Malware Path and File Name}:*:%Windows%\ggdrive32.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = "0"

Propagation

This worm drops the following copy(ies) of itself in all removable drives:

  • RECYCLER\R-1-5-21-1482476501-1644491937-682003330-1013\acleaner.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

The said .INF file contains the following strings:

{garbage}
[autorun]
open=RECYCLER\R-1-5-21-1482476501-1644491937-682003330-1013\acleaner.exe
{garbage}icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shell\open=Open
shell\open\command=RECYCLER\R-1-5-21-1482476501-1644491937-682003330-1013\acleaner.exe
{garbage}
shell\open\default=1
{garbage}

It sends copies of itself to target recipients using the following instant-messaging (IM) applications:

  • MSN

Download Routine

This worm accesses the following websites to download files:

  • http://{BLOCKED}g.net/xxudv.exe - detected as TROJ_KOLAB.FH
  • http://{BLOCKED}natraoi.com/serv8.exe - detected as TROJ_FAKEAV.SM8
  • http://{BLOCKED}natraoi.com/dq.exe - detected as TROJ_FAKEAV.SM8

It downloads an updated copy of itself from the following website(s):

  • http://{BLOCKED}natraoi.com/ms.exe - also detected as WORM_KOLAB.FH

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

Other Details

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

  • http://www.{BLOCKED}e.net/cgi-bin/envchk/prxjdg.cgi
  • http://{BLOCKED}o.hp.infoseek.co.jp/cgi-bin/nph/prxjdg.cgi
  • http://www.{BLOCKED}sy.com/cgi-bin/prxjdg.cgi
  • http://www.{BLOCKED}p.info/cgi-bin/prxjdg.cgi
  • http://{BLOCKED}tegod.com/cgi-bin/prxjdg.cgi
  • http://{BLOCKED}6.tok2.com/home/aquemai/cgi-bin/prxjdg.cgi
  • http://{BLOCKED}.{BLOCKED}.22.245/prxjdg.cgi
  • http://www.{BLOCKED}n.to/cgi-bin/prxjdg.cgi
  • http://{BLOCKED}s.ru/img/prxjdg.cgi

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine: 8.900
VSAPI OPR PATTERN File: 7.852.10
VSAPI OPR PATTERN Date: 22 Feb 2011

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Remove malware files dropped/downloaded by WORM_KOLAB.FH

    TROJ_FAKEAV.SM8
    TROJ_KOLAB.FH

Step 3

Terminate a malware/grayware process

[ Learn More ]

*Note: If the detected process is not displayed in theWindows Task Manager, continue doing the next steps.


Step 4

Delete this registry value

[ 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
    • Microsoft Driver Setup = %Windows%\ggdrive32.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Microsoft Driver Setup = %Windows%\ggdrive32.exe
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
    • EnableFirewall = 0
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • {Malware Path and File Name} = {Malware Path and File Name}:*:%Windows%\ggdrive32.exe

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.

{removable drive}\RECYCLER

Step 6

Search and delete AUTORUN.INF files created by WORM_KOLAB.FH that contain these strings

[ Learn More ]
{garbage}
[autorun]
open=RECYCLER\R-1-5-21-1482476501-1644491937-682003330-1013\acleaner.exe
{garbage}icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shell\open=Open
shell\open\command=RECYCLER\R-1-5-21-1482476501-1644491937-682003330-1013\acleaner.exe
{garbage}
shell\open\default=1
{garbage}

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_KOLAB.FH. 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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