WORM_SDBOT.SMXB
Backdoor:Win32/Arwobot.B (Microsoft); W32/Sdbot.worm!ng (McAfee); Backdoor.IRC.Bot (Symantec); Backdoor.Win32.IRCBot.igb (Kaspersky); Backdoor.Win32.Arwobot.B (v) (Sunbelt); Gen:Win32.IRC-Backdoor.dmX@aCyuWLg (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
60,929 bytes
EXE
Yes
28 Apr 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.
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
Windows Update = "%Program Files%\Common Files\System\taskmger.exe"
Other System Modifications
This worm adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Program Files%\Common Files\System\taskmger.exe = "{random characters}"
Dropping Routine
This worm drops the following files:
- %Program Files%\Common Files\System\taskmger.exe
(Note: %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).)
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 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
- Windows Update = "%Program Files%\Common Files\System\taskmger.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %Program Files%\Common Files\System\taskmger.exe = "{random characters}"
Step 4
Search and delete this file
- %Program Files%\Common Files\System\taskmger.exe
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_SDBOT.SMXB. 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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