WORM_SCUDY.SMA
TrojanDropper:Win32/Scudy.A (Microsoft); Generic Dropper.nt (McAfee); Hacktool.Rootkit (Symantec); Trojan.Win32.Scar.lzt (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan:W32/Scar.O (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm 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
5,369,901 bytes
EXE
Yes
23 Jul 2012
Arrival Details
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This worm drops the following copies of itself into the affected system:
- %System Root%\Config.Msi\5ce97.rbf.exe
- %Program Files%\Common Files\Microsoft Shared\DAO.exe
- %Program Files%\Common Files\Microsoft Shared\MSInfo\msinfo32.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
It creates the following folders:
- %System Root%\Config.Msi
- %System Root%\S-1-9-85-0512001
- %System Root%\HELP
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
debugger = "%System Root%\Config.Msi\5ce97.rbf.exe"
Other System Modifications
This worm deletes the following files:
- %System Root%\S-1-9-85-0512001\dfb7ed52902637ed99232a5adf78384e6d8f3007_66f0677329a7b8c61cf274b27660 .exe
- %System Root%\S-1-9-85-0512001\msinfo32.exe
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Windows% is the Windows folder, which is usually C:\Windows.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
999 = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
01 = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
02 = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
03 = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
04 = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
05 = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
06 = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
07 = "0"
It 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 2.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
HideFileExt = "1"
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
SuperHidden = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Lsa
forceguest = "0"
(Note: The default value data of the said registry entry is 1.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\lanmanserver
Start = "2"
(Note: The default value data of the said registry entry is 2.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\lanmanworkstation
Start = "2"
(Note: The default value data of the said registry entry is 2.)
Dropping Routine
This worm drops the following files:
- %System Root%\dfb7ed52902637ed99232a5adf78384e6d8f3007_66f0677329a7b8c61cf274b27660 .exe
- %System%\Drivers\PCIDump.sys
- %System Root%\Config.Msi\ssss.wav
- %Windows%\security\database\db32.idx
- %System Root%\Config.Msi\yyyy.bmp
- %System Root%\HELP\939516032.wav
- %System Root%\HELP\939516032.JPG
- %System Root%\S-1-9-85-0512001\dfb7ed52902637ed99232a5adf78384e6d8f3007_66f0677329a7b8c61cf274b27660 .exe
- %System Root%\S-1-9-85-0512001\msinfo32.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %Windows% is the Windows folder, which is usually C:\Windows.)
Other Details
This worm connects to the following possibly malicious URL:
- http://theworldnews.{BLOCKED}st5.com/online.php?{random characters}
- http://theworldnews.{BLOCKED}st5.com/en/us/defualt.aspx
This report is generated via an automated analysis system.
SOLUTION
9.200
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_LOCAL_MACHINE\SOFTWARE
- INTEL
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\RunOnce
- debugger = "%System Root%\Config.Msi\5ce97.rbf.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
- 999 = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- ShowSuperHidden = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
- 01 = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
- 02 = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
- 03 = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
- 04 = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
- 05 = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
- 06 = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\INTEL
- 07 = "0"
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: Hidden = "2"
To: Hidden = ""2""
- From: Hidden = "2"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- From: HideFileExt = "1"
To: HideFileExt = ""1""
- From: HideFileExt = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- SuperHidden = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Lsa
- From: forceguest = "0"
To: forceguest = ""1""
- From: forceguest = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\lanmanserver
- From: Start = "2"
To: Start = ""2""
- From: Start = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\lanmanworkstation
- From: Start = "2"
To: Start = ""2""
- From: Start = "2"
Step 6
Search and delete these components
- %System Root%\dfb7ed52902637ed99232a5adf78384e6d8f3007_66f0677329a7b8c61cf274b27660 .exe
- %System%\Drivers\PCIDump.sys
- %System Root%\Config.Msi\ssss.wav
- %Windows%\security\database\db32.idx
- %System Root%\Config.Msi\yyyy.bmp
- %System Root%\HELP\939516032.wav
- %System Root%\HELP\939516032.JPG
- %System Root%\S-1-9-85-0512001\dfb7ed52902637ed99232a5adf78384e6d8f3007_66f0677329a7b8c61cf274b27660 .exe
- %System Root%\S-1-9-85-0512001\msinfo32.exe
Step 7
Search and delete these folders
- %System Root%\Config.Msi
- %System Root%\S-1-9-85-0512001
- %System Root%\HELP
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_SCUDY.SMA. 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 9
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %System Root%\S-1-9-85-0512001\dfb7ed52902637ed99232a5adf78384e6d8f3007_66f0677329a7b8c61cf274b27660 .exe
- %System Root%\S-1-9-85-0512001\msinfo32.exe
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
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