WORM_KOLAB.OS
Windows 2000, XP, Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
It monitors processes to steal user credentials.
This worm arrives via removable drives. It may be downloaded by other malware/grayware/spyware from remote sites. It may be unknowingly downloaded by a user while visiting malicious websites.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
It executes commands from a remote malicious user, effectively compromising the affected system.
TECHNICAL DETAILS
Arrival Details
This worm arrives via removable drives.
It may be downloaded by other malware/grayware/spyware from remote sites.
It may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This worm drops the following component file(s):
- {drive letter}:\hotenvy\coldenvy\Desktop.ini
It drops the following copies of itself into the affected system:
- %Application Data%\traymgr.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
JavaTray = %Application Data%\traymgr.exe
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
MicrosoftNAPC = %Application Data%\traymgr.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
JavaTray = %Application Data%\traymgr.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
MicrosoftNAPC = %Application Data%\traymgr.exe
Other System Modifications
This worm modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue = 0
(Note: The default value data of the said registry entry is 1.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SystemRestore
DisableSR = 1
(Note: The default value data of the said registry entry is 0.)
It deletes the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot
Propagation
This worm creates the following folders in all removable drives:
- {drive letter}:\hotenvy
- {drive letter}:\hotenvy\coldenvy
It drops the following copy(ies) of itself in all removable drives:
- {drive letter}:\hotenvy\coldenvy\traymgr.exe
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
The said .INF file contains the following strings:
autorun]
[autorun[
[autorun]
open=hotenvy\coldenvy\traymgr.exe
icon=%syStEmrOot%\sySTeM32\sHELL32.dll,4
action=Open folder to view files
UseAuTOPLAY=1
shell\open\command=hotenvy\coldenvy\traymgr.exe
shell\Explore\Command=hotenvy\coldenvy\traymgr.exe
Backdoor Routine
This worm executes the following commands from a remote malicious user:
- Spread via MSN Messenger
- Perform a DDoS attack
- Keylog
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- {BLOCKED}ftupdate.legion014.com
Process Termination
This worm terminates processes or services that contain any of the following strings if found running in the affected system's memory:
- AdvancedConnectionViewer.exe
- advscan
- Analyzer
- Anti-Malware
- Anti-Spyware
- Anti-Virus
- AntiSpyware
- AntiVirus
- Auto Start and Process Viewer : www.konradp.com
- autostart_and_process_viewer.exe
- Connectionwatcher.exe
- cports.exe
- Ethereal
- File Monitor - Sysinternals: www.sysinternals.com
- FileAlyzer.exe
- filemon.exe
- firefox.exe
- FirePass|
- flock.exe
- HijackThis
- Hijackthis.exe
- HookExplorer.exe
- HostBooter
- hotfix
- Killbox.exe
- mbam.exe
- MSASCui.exe
- msconfig.exe
- PrcView.exe
- Process Explorer - Sysinternals: www.sysinternals.com
- Process Monitor - Sysinternals: www.sysinternals.com
- procexp.exe
- procmon.exe
- RegAlyzer.exe
- RegScanner.exe
- RunAlyzer.exe
- seamonkey.exe
- SmartSniff
- smsniff.exe
- SocketSniff
- SpybotSD.exe
- Startup Defender.exe
- Stinger
- sysAnalyzer
- sysclean.exe
- TCPView - Sysinternals: www.sysinternals.com
- Tcpview.exe
- TeaTimer.exe
- The Wireshark Network Analyzer
- Unlocker.exe
- UnlockerAssistant.exe
- WinPcap
- Wireshark
- wireshark.exe
- www.konradp.com
- www.malwarebytes.org
- www.sysinternals.com
- Winpatrol.exe
Other Details
Internet activities are monitored by a malicious user.
It does the following:
- It monitors the following processes to steal user credentials:
- firefox.exe
- iexplore.exe
- opera.exe
- flock.exe
- seamonkey.exe
- safari.exe
- netscape.exe
SOLUTION
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
Identify and delete files detected as WORM_KOLAB.OS using either the Startup Disk or Recovery Console
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
- JavaTray = %Application Data%\traymgr.exe
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- MicrosoftNAPC = %Application Data%\traymgr.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- JavaTray = %Application Data%\traymgr.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- MicrosoftNAPC = %Application Data%\traymgr.exe
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\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
- From:CheckedValue = 0
- To:CheckedValue = 1
- From:CheckedValue = 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore
- From:DisableSR = 1
- To:DisableSR = 0
- From:DisableSR = 1
Step 5
Search and delete these folders
Step 6
Search and delete AUTORUN.INF files created by WORM_KOLAB.OS that contain these strings
Step 7
Scan your computer with your Trend Micro product to delete files detected as WORM_KOLAB.OS. 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.
NOTES:
Step 8: Restore this Registry
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot
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