WORM_DOWNAD.DA
Worm:Win32/Conficker.B (MICROSOFT), Net-Worm.Win32.Kido.ih (KASPERSKY), I-Worm/Generic.CKH (AVG)
Windows
Threat Type: Worm
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This worm arrives via removable drives.
It bypasses the Windows firewall. This allows the malware to perform its intended routine without being detected by an installed firewall.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
167,324 bytes
EXE
Yes
06 Aug 2013
Arrival Details
This worm arrives via removable drives.
Installation
This worm adds the following folders:
- {removable drive}:\RECYCLER
- {removable drive}:\RECYCLER\S-5-3-42-2819952290-8240758988-879315005-3665
It drops the following files:
- {Removable Drive Letter}:/autorun.inf
- %System%\{random characters}.tmp
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)
It drops the following copies of itself into the affected system:
- {removable drive}:\RECYCLER\S-5-3-42-2819952290-8240758988-879315005-3665\jwgkvsq.vmx
Other System Modifications
This worm adds the following registry keys:
HKLM\System\CurrentControlSet\
Services\{Random characters}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\{Random characters}
Start = "3"
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\{Random characters}
ErrorControl = "0"
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\{Random characters}
ImagePath = "\??\%System%\{random characters}.tmp"
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\{Random characters}
DisplayName = "{Random characters}"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
Showall
CheckedValue = "0"
(Note: The default value data of the said registry entry is "1".)
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".)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wscsvc
Start = "4"
(Note: The default value data of the said registry entry is "2".)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wuauserv
Start = "4"
(Note: The default value data of the said registry entry is "2".)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\BITS
Start = "4"
(Note: The default value data of the said registry entry is "3".)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ERSvc
Start = "4"
(Note: The default value data of the said registry entry is "2".)
It modifies the following registry entries to disable the Windows Firewall settings:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
{random numbers}:TCP = "{random numbers}:TCP:*:Enabled:{random characters}"
Propagation
This worm drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
Other Details
This worm connects to the following URL(s) to get the affected system's IP address:
- www.getmyip.org
- www.whatismyip.org
- www.whatsmyipaddress.com
- checkip.dyndns.org
SOLUTION
9.700
10.404.04
10.405.00
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Search and delete this file
- {Removable Drive Letter}:/autorun.inf
- %System%\{random characters}.tmp
Step 4
Delete this registry key
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\
\Services
- {Random characters}
Step 5
Delete this registry value
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\GloballyOpenPorts\List- {random numbers}
:TCP = "{random numbers}
:TCP:*:Enabled:{random characters}"
- {random numbers}
Step 6
Restore this modified registry value
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\Explorer\Advanced\Folder\Hidden\Showall
- From: CheckedValue = "0"
To: CheckedValue = "1"
- From: CheckedValue = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: Hidden = "2"
To: Hidden = "1"
- From: Hidden = "2"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: DontPrettyPath = "0"
To: DontPrettyPath = "1"
- From: DontPrettyPath = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: HideIcons = "0"
To: HideIcons = "1"
- From: HideIcons = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: SuperHidden = "0"
To: SuperHidden = "1"
- From: SuperHidden = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
\Services\wscsvc- From: Start = "4"
To: Start = "2"
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
\Services\wuauserv- From: Start = "4"
To: Start = "2"
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
\Services\BITS- From: Start = "4"
To: Start = "3"
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet
\Services\ERSvc- From: Start = "4"
To: Start = "2"
- From: Start = "4"
Step 7
Search and delete this folder
- {removable drive}:\RECYCLER
Step 8
Scan your computer with your Trend Micro product to delete files detected as WORM_DOWNAD.DA. 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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