1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112
|
Rule:
--
Sid:
120
--
Summary:
Infector is a Trojan Horse.
--
Impact:
Possible theft of data via download, upload of files, execution of files
and reboot the targeted machine.
--
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.
--
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.
--
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.
--
False Positives:
None Known
--
False Negatives:
None Known
--
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.
--
Contributors:
Original Rule Writer Max Vision <vision@whitehats.com>
Sourcefire Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>
--
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
--
|