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TROJ_MALQLZ.A

October 09, 2012
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

Worm.Win32.VB.dz (Kaspersky), W32/Bactera.worm!p2p (McAfee), Trojan Horse (Symantec), W32/Dropper.DZZ (exact) (F-Prot)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

7,168 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 Mar 2008

Arrival Details

This Trojan may be dropped by other malware.

Other System Modifications

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ SharedAccess\Parameters\
FirewallPolicy\StandardProfile\ AuthorizedApplications\
List
{malware path} = "{malware path}:*:Enabled:TCP"

NOTES:
It also creates the following registry entries to disable file tracing:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG
EnableFileTracing = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG
EnableConsoleTracing = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing\FWCFG
FileTracingMask = 0

It also requires the presence of the P2P application eMule to execute properly.

  SOLUTION

Minimum Scan Engine:

9.200

VSAPI OPR PATTERN File:

5.883.00

VSAPI OPR PATTERN Date:

08 Apr 2009

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

Scan your computer with your Trend Micro product and note files detected as TROJ_MALQLZ.A

Step 3

Terminate a process file/s detected as TROJ_MALQLZ.A

[ Learn More ]

*Note: If the detected file/s is/are 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\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • {malware path} = "{malware path}:*:Enabled:TCP"

Step 5

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Tracing
    • FWCFG

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_MALQLZ.A. 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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