WORM_COSMU.EG
Trojan:Win32/Rimod (Microsoft); W32/Autorun.worm!mw (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Cosmu.akuv (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); May be infected by unknown virus Win32/DH{Aw94CQ} (AVG)
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.
It disables Task Manager, Registry Editor, and Folder Options.
TECHNICAL DETAILS
32,768 bytes
EXE
Yes
27 Mar 2013
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.
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\Run
Jack_danny_Bangsat = "Jack_Danny_Goblog"
Other System Modifications
This worm adds the following registry keys:
HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\System
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Advanced
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Window Title = "Jack_Danny Anjing"
HKEY_CURRENT_USER\Software\Policies\
Microsoft\Windows\System
DisableCMD = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableMsConfig = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Advanced
Hidden = "0"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
RegisteredOwner = "Jack_Danny"
(Note: The default value data of the said registry entry is user00.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
RegisteredOrganization = "Jack_Danny_teo"
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoRun = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoFind = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoFolderOptions = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoClose = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoControlPanel = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoViewContextMenu = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoStartMenuMoreProgram = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoViewOnDrive = "1"
Dropping Routine
This worm drops the following files:
- tai_lw.exe
- Bangsat_lw.exe
- %User Startup%\Anjing_lw.exe
- autorun.inf
- %User Startup%\autorun.inf
- %System Root%\tai_lw.exe
- %System Root%\autorun.inf
- a:\tai_lw.exe
- a:\autorun.inf
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
This report is generated via an automated analysis system.
SOLUTION
9.300
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
Enable Registry Editor, Task Manager, and Folder options
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_CURRENT_USER\Software\Policies\Microsoft\Windows
- System
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
- System
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
- Advanced
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\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Jack_danny_Bangsat = "Jack_Danny_Goblog"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- Window Title = "Jack_Danny Anjing"
- In HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System
- DisableCMD = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
- DisableMsConfig = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Advanced
- Hidden = "0"
Step 6
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\Windows NT\CurrentVersion
- From: RegisteredOwner = "Jack_Danny"
To: RegisteredOwner = ""user00""
- From: RegisteredOwner = "Jack_Danny"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
- RegisteredOrganization = "Jack_Danny_teo"
Step 7
Search and delete these components
- tai_lw.exe
- Bangsat_lw.exe
- %User Startup%\Anjing_lw.exe
- autorun.inf
- %User Startup%\autorun.inf
- %System Root%\tai_lw.exe
- %System Root%\autorun.inf
- a:\tai_lw.exe
- a:\autorun.inf
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_COSMU.EG. 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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