TROJ_IRCBRUTE.CI
Windows 2000, XP, Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan executes then deletes itself afterward.
TECHNICAL DETAILS
159,744 bytes
PE
Yes
15 Jul 2010
Modifies system registry
Installation
This Trojan drops the following copies of itself into the affected system:
- %Application Data%\{Random File Name}.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.)
It executes then deletes itself afterward.
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{Random Name} = %Application Data%\{Random File Name}.exe
Other System Modifications
This Trojan creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{Legitimate Application} = {Legitimate Application}:*:Enabled:{Malware's Registry Name}
SOLUTION
8.900
7.312.01
15 Jul 2010
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
Scan your computer with your Trend Micro product and note files detected as TROJ_IRCBRUTE.CI
Step 3
Restart in Safe Mode
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {Random Name} = %Application Data%\{Random File Name}.exe
- {Random Name} = %Application Data%\{Random File Name}.exe
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- {Legitimate Application} = {Legitimate Application}:*:Enabled:{Malware's Registry Name}
- {Legitimate Application} = {Legitimate Application}:*:Enabled:{Malware's Registry Name}
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_IRCBRUTE.CI. 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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