TROJ_DLOADR.YQ
Trojan.Spuler (Symantec)
Windows 2000, Windows XP, Windows Server 2003
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.
It deletes itself after execution.
TECHNICAL DETAILS
107,907 bytes
EXE
No
26 Nov 2012
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.
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
MSFix
HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\Software\
Microsoft\Internet Explorer\Main\
FeatureControl\FEATURE_LOCALMACHINE_LOCKDOWN
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
MSFix
icnosltoarll = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_LOCALMACHINE_LOCKDOWN
iexplore.exe = "0"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\HTTPFilter
Start = "2"
(Note: The default value data of the said registry entry is 3.)
It deletes the following registry keys:
HKEY_USERS\.DEFAULT\SOFTWARE\
Microsoft\MSFix
HKEY_USERS\S-1-5-19\SOFTWARE\
Microsoft\MSFix
HKEY_USERS\S-1-5-19_Classes\SOFTWARE\
Microsoft\MSFix
HKEY_USERS\S-1-5-20\SOFTWARE\
Microsoft\MSFix
HKEY_USERS\S-1-5-20_Classes\SOFTWARE\
Microsoft\MSFix
HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\SOFTWARE\
Microsoft\MSFix
HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003_Classes\SOFTWARE\
Microsoft\MSFix
HKEY_USERS\S-1-5-18\SOFTWARE\
Microsoft\MSFix
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Network\a
- %Temp%\d091.tmp
- %User Temp%\Start.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://www.{BLOCKED}awn.com/components/com_poll/models/polls.php?{random characters}
- http://{BLOCKED}vecchiainforma.it/cms/components/com_poll/images/polls.php?{random characters}
It deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
9.300
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
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\SOFTWARE\Microsoft
- MSFix
- In HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\Software\Microsoft\Internet Explorer\Main\FeatureControl
- FEATURE_LOCALMACHINE_LOCKDOWN
Step 3
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\MSFix
- icnosltoarll = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_LOCALMACHINE_LOCKDOWN
- iexplore.exe = "0"
Step 4
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\SYSTEM\ControlSet001\Services\HTTPFilter
- From: Start = "2"
To: Start = ""3""
- From: Start = "2"
Step 5
Search and delete these files
- %User Profile%\Network\a
- %Temp%\d091.tmp
- %User Temp%\Start.exe
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.YQ. 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.
Step 7
Restore these deleted registry keys/values from backup
*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- In HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft
- MSFix
- In HKEY_USERS\S-1-5-19\SOFTWARE\Microsoft
- MSFix
- In HKEY_USERS\S-1-5-19_Classes\SOFTWARE\Microsoft
- MSFix
- In HKEY_USERS\S-1-5-20\SOFTWARE\Microsoft
- MSFix
- In HKEY_USERS\S-1-5-20_Classes\SOFTWARE\Microsoft
- MSFix
- In HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003\SOFTWARE\Microsoft
- MSFix
- In HKEY_USERS\S-1-5-21-1645522239-1292428093-682003330-1003_Classes\SOFTWARE\Microsoft
- MSFix
- In HKEY_USERS\S-1-5-18\SOFTWARE\Microsoft
- MSFix
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