TROJ_DLOADER.IPB
TrojanDownloader:Win32/Renos.AS (Microsoft); Downloader-ASH.gen.b (McAfee); Packed.Generic.186 (Symantec); Backdoor.Win32.Frauder.an (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)
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.
TECHNICAL DETAILS
199,168 bytes
EXE
Yes
18 Oct 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.
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
lphc3u8j0eral = "%System%\lphc3u8j0eral.exe"
Other System Modifications
This Trojan deletes the following files:
- %System%\lphc3u8j0eral.exe:Zone.Identifier
- %User Temp%\.tt2.tmp
- %User Temp%\.tt3.tmp
- %User Temp%\.tt4.tmp
- %User Temp%\.tt5.tmp
- %User Temp%\.tt6.tmp
- %User Temp%\.tt7.tmp
- %User Temp%\.tt8.tmp
- %User Temp%\.tt9.tmp
- %User Temp%\.ttA.tmp
- %User Temp%\.ttB.tmp
- %User Temp%\.ttC.tmp
- %User Temp%\.ttD.tmp
- %User Temp%\.ttE.tmp
- %User Temp%\.ttF.tmp
- %User Temp%\.tt10.tmp
- %User Temp%\.tt11.tmp
- %User Temp%\.tt12.tmp
- %User Temp%\.tt13.tmp
- %User Temp%\.tt14.tmp
- %User Temp%\.tt15.tmp
- %User Temp%\.tt16.tmp
- %User Temp%\.tt17.tmp
- %User Temp%\.tt18.tmp
- %User Temp%\.tt19.tmp
- %User Temp%\.tt1A.tmp
- %User Temp%\.tt1B.tmp
- %User Temp%\.tt1C.tmp
- %User Temp%\.tt1D.tmp
- %User Temp%\.tt1E.tmp
- %User Temp%\.tt1F.tmp
- %User Temp%\.tt20.tmp
- %User Temp%\.tt21.tmp
- %User Temp%\.tt22.tmp
- %User Temp%\.tt23.tmp
- %User Temp%\.tt24.tmp
- %User Temp%\.tt25.tmp
- %User Temp%\.tt26.tmp
- %User Temp%\.tt27.tmp
- %User Temp%\.tt28.tmp
- %User Temp%\.tt29.tmp
- %User Temp%\.tt2A.tmp
- %User Temp%\.tt2B.tmp
- %User Temp%\.tt2C.tmp
- %User Temp%\.tt2D.tmp
- %User Temp%\.tt2E.tmp
- %User Temp%\.tt2F.tmp
- %User Temp%\.tt30.tmp
- %User Temp%\.tt31.tmp
- %User Temp%\.tt32.tmp
- %User Temp%\.tt33.tmp
- %User Temp%\.tt34.tmp
- %User Temp%\.tt35.tmp
- %User Temp%\.tt36.tmp
- %User Temp%\.tt37.tmp
- %User Temp%\.tt38.tmp
- %User Temp%\.tt39.tmp
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %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.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Software Notifier
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
HKEY_CURRENT_USER\Software\Sysinternals
HKEY_CURRENT_USER\Software\Sysinternals\
Bluescreen Screen Saver
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Software Notifier
InstallID = "f371b027-dda3-467e-990f-f7bb518db6d8"
HKEY_CURRENT_USER\Control Panel\Desktop
ConvertedWallpaper = "%System%\phc3u8j0eral.bmp"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
NoDispBackgroundPage = "1"
HKEY_CURRENT_USER\Software\Sysinternals\
Bluescreen Screen Saver
EulaAccepted = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
NoDispScrSavPage = "1"
It modifies the following registry entries:
HKEY_CURRENT_USER\Control Panel\Colors
Background = "0 0 255"
(Note: The default value data of the said registry entry is 0 78 152.)
HKEY_CURRENT_USER\Control Panel\Desktop
WallpaperStyle = "0"
(Note: The default value data of the said registry entry is 2.)
HKEY_CURRENT_USER\Control Panel\Desktop
TileWallpaper = "0"
(Note: The default value data of the said registry entry is 0.)
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%System%\phc3u8j0eral.bmp"
(Note: The default value data of the said registry entry is %Windows%\web\wallpaper\Bliss.bmp.)
HKEY_CURRENT_USER\Control Panel\Desktop
OriginalWallpaper = "%System%\phc3u8j0eral.bmp"
HKEY_CURRENT_USER\Control Panel\Desktop
SCRNSAVE.EXE = "%System%\blphc3u8j0eral.scr"
(Note: The default value data of the said registry entry is %Windows%\system32\logon.scr.)
HKEY_CURRENT_USER\Control Panel\Desktop
ScreenSaveActive = "1"
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Control Panel\Desktop
ScreenSaveTimeOut = "600"
(Note: The default value data of the said registry entry is 600.)
Dropping Routine
This Trojan drops the following files:
- %System%\phc3u8j0eral.bmp
- %User Temp%\.tt1.tmp.vbs
- %System%\blphc3u8j0eral.scr
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %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://windowsupdate.{BLOCKED}oft.com
- http://{BLOCKED}008.net/{random path}
This report is generated via an automated analysis system.
SOLUTION
9.200
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
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\Microsoft
- Software Notifier
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
- System
- In HKEY_CURRENT_USER\Software
- Sysinternals
- In HKEY_CURRENT_USER\Software\Sysinternals
- Bluescreen Screen Saver
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
- lphc3u8j0eral = "%System%\lphc3u8j0eral.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Software Notifier
- InstallID = "f371b027-dda3-467e-990f-f7bb518db6d8"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- ConvertedWallpaper = "%System%\phc3u8j0eral.bmp"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
- NoDispBackgroundPage = "1"
- In HKEY_CURRENT_USER\Software\Sysinternals\Bluescreen Screen Saver
- EulaAccepted = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
- NoDispScrSavPage = "1"
Step 5
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_CURRENT_USER\Control Panel\Colors
- From: Background = "0 0 255"
To: Background = ""0 78 152""
- From: Background = "0 0 255"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: WallpaperStyle = "0"
To: WallpaperStyle = ""2""
- From: WallpaperStyle = "0"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: TileWallpaper = "0"
To: TileWallpaper = ""0""
- From: TileWallpaper = "0"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: Wallpaper = "%System%\phc3u8j0eral.bmp"
To: Wallpaper = ""%Windows%\web\wallpaper\Bliss.bmp""
- From: Wallpaper = "%System%\phc3u8j0eral.bmp"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- OriginalWallpaper = "%System%\phc3u8j0eral.bmp"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: SCRNSAVE.EXE = "%System%\blphc3u8j0eral.scr"
To: SCRNSAVE.EXE = ""%Windows%\system32\logon.scr""
- From: SCRNSAVE.EXE = "%System%\blphc3u8j0eral.scr"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: ScreenSaveActive = "1"
To: ScreenSaveActive = ""1""
- From: ScreenSaveActive = "1"
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: ScreenSaveTimeOut = "600"
To: ScreenSaveTimeOut = ""600""
- From: ScreenSaveTimeOut = "600"
Step 6
Search and delete these files
- %System%\phc3u8j0eral.bmp
- %User Temp%\.tt1.tmp.vbs
- %System%\blphc3u8j0eral.scr
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOADER.IPB. 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 8
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%\lphc3u8j0eral.exe:Zone.Identifier
- %User Temp%\.tt2.tmp
- %User Temp%\.tt3.tmp
- %User Temp%\.tt4.tmp
- %User Temp%\.tt5.tmp
- %User Temp%\.tt6.tmp
- %User Temp%\.tt7.tmp
- %User Temp%\.tt8.tmp
- %User Temp%\.tt9.tmp
- %User Temp%\.ttA.tmp
- %User Temp%\.ttB.tmp
- %User Temp%\.ttC.tmp
- %User Temp%\.ttD.tmp
- %User Temp%\.ttE.tmp
- %User Temp%\.ttF.tmp
- %User Temp%\.tt10.tmp
- %User Temp%\.tt11.tmp
- %User Temp%\.tt12.tmp
- %User Temp%\.tt13.tmp
- %User Temp%\.tt14.tmp
- %User Temp%\.tt15.tmp
- %User Temp%\.tt16.tmp
- %User Temp%\.tt17.tmp
- %User Temp%\.tt18.tmp
- %User Temp%\.tt19.tmp
- %User Temp%\.tt1A.tmp
- %User Temp%\.tt1B.tmp
- %User Temp%\.tt1C.tmp
- %User Temp%\.tt1D.tmp
- %User Temp%\.tt1E.tmp
- %User Temp%\.tt1F.tmp
- %User Temp%\.tt20.tmp
- %User Temp%\.tt21.tmp
- %User Temp%\.tt22.tmp
- %User Temp%\.tt23.tmp
- %User Temp%\.tt24.tmp
- %User Temp%\.tt25.tmp
- %User Temp%\.tt26.tmp
- %User Temp%\.tt27.tmp
- %User Temp%\.tt28.tmp
- %User Temp%\.tt29.tmp
- %User Temp%\.tt2A.tmp
- %User Temp%\.tt2B.tmp
- %User Temp%\.tt2C.tmp
- %User Temp%\.tt2D.tmp
- %User Temp%\.tt2E.tmp
- %User Temp%\.tt2F.tmp
- %User Temp%\.tt30.tmp
- %User Temp%\.tt31.tmp
- %User Temp%\.tt32.tmp
- %User Temp%\.tt33.tmp
- %User Temp%\.tt34.tmp
- %User Temp%\.tt35.tmp
- %User Temp%\.tt36.tmp
- %User Temp%\.tt37.tmp
- %User Temp%\.tt38.tmp
- %User Temp%\.tt39.tmp
Did this description help? Tell us how we did.