TROJ_DLOADR.AQL
FakeAlert-SecurityTool.cv (McAfee); Trojan.FakeAV (Symantec); Trojan-Ransom.Win32.HmBlocker.fkl (Kaspersky); Packer.Win32.Mystic.a (v) (Sunbelt); Win32/Cryptor (AVG)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SmartIndex = "{malware path and file name}"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Google
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Google
AppID = "DPRpBr2Ip+Yh3vYA+mw1n+8mNlAgGWhWVn0TNAR88LUwcnTrRZz/8rZUZCivf/LnCA=="
HKEY_CURRENT_USER\Software\Google
ID = "5"
HKEY_CURRENT_USER\Software\Google
ID2 = "{random values}"
HKEY_CURRENT_USER\Software\Google
ID3 = "{random values}"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "{malware file name}"
(Note: The default value data of the said registry entry is iexplore.exe.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = "423eb7a7"
(Note: The default value data of the said registry entry is 41107b81.)
Dropping Routine
This Trojan drops the following files:
- %System%\Packet.dll
- %System%\wpcap.dll
- %System%\drivers\npf.sys
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
This report is generated via an automated analysis system.
SOLUTION
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
Step 3
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_CURRENT_USER\Software
Step 4
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\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- SmartIndex = "{malware path and file name}"
- In HKEY_CURRENT_USER\Software\Google
- AppID = "DPRpBr2Ip+Yh3vYA+mw1n+8mNlAgGWhWVn0TNAR88LUwcnTrRZz/8rZUZCivf/LnCA=="
- In HKEY_CURRENT_USER\Software\Google
- ID = "5"
- In HKEY_CURRENT_USER\Software\Google
- ID2 = "{random values}"
- In HKEY_CURRENT_USER\Software\Google
- ID3 = "{random values}"
Step 5
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: Name = "{malware file name}"
To: Name = ""iexplore.exe""
- From: Name = "{malware file name}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
- From: ID = "423eb7a7"
To: ID = ""41107b81""
- From: ID = "423eb7a7"
Step 6
Search and delete these components
- %System%\Packet.dll
- %System%\wpcap.dll
- %System%\drivers\npf.sys
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOADR.AQL. 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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