WORM_SPYBOT.CRE
Backdoor:Win32/IRCbot.gen!K (Microsoft), W32/Spybot.worm!eb (McAfee), W32.IRCBot (Symantec)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Via software vulnerabilities, Dropped by other malware, Downloaded from the Internet
This worm arrives via removable drives. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
423,192 bytes
EXE
Yes
08 Nov 2012
Compromises system security
Arrival Details
This worm arrives via removable drives.
It 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%\crscs.exe
(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.)
Autostart Technique
This worm registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\rdssmangd
Other System Modifications
This worm adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{malware path and file name} = "{malware path and file name}:*:enabled:microsoft enabled"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\
Services\Tcpip\Parameters
MaxFree = "7d0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\
Services\Tcpip\Parameters
MaxHashTableSize = "800"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\
Services\Tcpip\Parameters
TcpTimedWaitDelay = "1e"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\
Services\Tcpip\Parameters
MaxUserPort = "f618"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Shell Extensions
systemxstuff = "{malware path and file name}"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control
WaitToKillServiceTimeout = "7000"
(Note: The default value data of the said registry entry is 20000.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wscsvc
Start = "4"
(Note: The default value data of the said registry entry is 2.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\wuauserv
Start = "4"
(Note: The default value data of the said registry entry is 2.)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess
Start = "4"
(Note: The default value data of the said registry entry is 2.)
Propagation
This worm creates the following folders in all removable drives:
- {drive letter}:\RECYCLER
- {drive letter}:\RECYCLER\S-1-6-21-2434476501-1644491937-600003330-1213
It drops the following copy(ies) of itself in all removable drives:
- {drive letter}:\RECYCLER\S-1-6-21-2434476501-1644491937-600003330-1213\autorunme.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]
open=RECYCLER\S-1-6-21-2434476501-1644491937-600003330-1213\autorunme.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shell\open=Open
shell\open\command=RECYCLER\S-1-6-21-2434476501-1644491937-600003330-1213\autorunme.exe
shell\open\default=1
Other Details
This worm connects to the following possibly malicious URL:
- http://{BLOCKED}exit.com:8280
- http://{BLOCKED}66.{BLOCKED}nkpc.net
SOLUTION
9.300
9.518.02
10 Nov 2012
9.519.00
11 Nov 2012
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\SYSTEM\CurrentControlSet\Services
- rdssmangd
- rdssmangd
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\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- {malware path and file name} = "{malware path and file name}:*:Enabled:Microsoft Enabled"
- {malware path and file name} = "{malware path and file name}:*:Enabled:Microsoft Enabled"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\Services\Tcpip\Parameters
- MaxFree = "7d0"
- MaxFree = "7d0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\Services\Tcpip\Parameters
- MaxHashTableSize = "800"
- MaxHashTableSize = "800"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\Services\Tcpip\Parameters
- TcpTimedWaitDelay = "1e"
- TcpTimedWaitDelay = "1e"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\Services\Tcpip\Parameters
- MaxUserPort = "f618"
- MaxUserPort = "f618"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions
- systemxstuff = "{malware path and file name}"
- systemxstuff = "{malware path and file name}"
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control
- From: WaitToKillServiceTimeout = "7000"
To: WaitToKillServiceTimeout = "20000"
- From: WaitToKillServiceTimeout = "7000"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc
- From: Start = "4"
To: Start = "2"
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv
- From: Start = "4"
To: Start = "2"
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess
- From: Start = "4"
To: Start = "2"
- From: Start = "4"
Step 6
Search and delete these folders
- {drive letter}:\RECYCLER
Step 7
Search and delete AUTORUN.INF files created by WORM_SPYBOT.CRE that contain these strings
[autorun]
open=RECYCLER\S-1-6-21-2434476501-1644491937-600003330-1213\autorunme.exe
icon=%SystemRoot%\system32\SHELL32.dll,4
action=Open folder to view files
shell\open=Open
shell\open\command=RECYCLER\S-1-6-21-2434476501-1644491937-600003330-1213\autorunme.exe
shell\open\default=1
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_SPYBOT.CRE. 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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