GEN:SID | 1:120 |
Message | BACKDOOR Infector 1.6 Server to Client |
Summary | Infector is a Trojan Horse.
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Impact | Possible theft of data via download, upload of files, execution of files and reboot the targeted machine.
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Detailed Information | This Trojan affects the following operating systems:
Windows 95 Windows 98 Windows ME
The Trojan changes system registry settings to add the Infector sever to programs normally started on boot. Due to the nature of this Trojan it is unlikely that the attacker's client IP address has been spoofed.
SID Message --- ------- 117 Infector 1.x 120 Infector 1.6 Server to Client 121 Infector 1.6 Client to Server Connection Request
This Trojan is commonly used to install other Trojan programs.
The Trojan also makes changes to the system registry and win.ini file.
Notification of an active server is achieved via IRC or ICQ.
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Affected Systems | |
Attack Scenarios | This Trojan may be delivered to the target in a number of ways. This event is indicative of an existing infection being activated. Initial compromise can be in the form of a Win32 installation program that may use the extension ".jpg" or ".bmp" when delivered via e-mail for example.
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Ease of Attack | This is Trojan activity, the target machine may already be compromised. Updated virus definition files are essential in detecting this Trojan.
The Trojan server is located at <drive>:\WINDOWS\Apxil32.exe a backup copy is made and usually named D3x32.drv.
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Corrective Action | Edit the system registry to remove the extra keys or restore a previously known good copy of the registry.
Affected registry keys are:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices
Registry keys added are:
apxil32 = apxil32.exe
Removal of this entry is required.
Delete the file <drive>:\WINDOWS\Apxil32.exe
Ending the Trojan process is also necessary. A reboot of the infected machine is recommended.
A change is also made to the win.ini file, the line run=apxil32.exe apxil32.exe is added and should be deleted.
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Additional References | Whitehats arachNIDS http://www.whitehats.com/info/IDS315 http://www.whitehats.com/info/IDS502 http://www.whitehats.com/info/IDS503
Diamond Computer Systems Security Advisory http://www.diamondcs.com.au/web/alerts/infector.htm
Megasecurity: http://www.megasecurity.org/trojans/i/infector/Infector_all.html
Simovits: http://www.simovits.com/trojans/tr_data/y1627.html
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Rule References | cve: 1999-0660
nessus: 11157
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