Analysis by: Rika Joi Gregorio
ALIASES:

Worm:Win32/Conficker.B(Microsoft), W32.Downadup.B(Symantec), W32/Conficker.worm.gen.a(McAfee), W32/Kido.IH!tr(Fortinet), Net-Worm.Win32.Kido(Ikarus), Win32/Conficker.AA worm(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: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm may be dropped by other malware.

  TECHNICAL DETAILS

File Size: 161,768 bytes
File Type: DLL
Memory Resident: Yes
Initial Samples Received Date: 04 Oct 2013

Arrival Details

This worm may be dropped by other malware.

Other System Modifications

This worm modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "2"

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
SuperHidden = "0"

(Note: The default value data of the said registry entry is 1.)

Other Details

This worm connects to the following URL(s) to get the affected system's IP address:

  • http://www.{BLOCKED}p.org
  • http://www.whatsmyipaddress.com
  • http://checkip.dyndns.org

It connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.150.27/search?q
  • http://{BLOCKED}.{BLOCKED}.193.252/search?q
  • http://{BLOCKED}.{BLOCKED}.69.25/search?q

NOTES:
Upon execution, it opens a window which displays the files under the malware path's root drive to hide its malicious routines from the user.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 10.398.05
FIRST VSAPI PATTERN DATE: 08 Nov 2013
VSAPI OPR PATTERN File: 10.399.00
VSAPI OPR PATTERN Date: 09 Nov 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

Restart in Safe Mode

[ Learn More ]

Step 3

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • From: Hidden = "2"
      To: Hidden = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • From: SuperHidden = "0"
      To: SuperHidden = 1

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_DOWNAD.GG. 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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