Yesterday Symantec spotted a new Trojan dubbed "Clampi". The risk level of this trojan is very low.
Systems Affected: Windows 98, Windows 95, Windows XP, Windows Me, Windows Vista, Windows NT, Windows Server 2003, Windows 2000
Trojan.Clampi is a Trojan horse that connects to a remote server and may download further updates or other threats on to the compromised computer.
Threat Assessment
* Wild Level: Low
* Number of Infections: 0 - 49
* Number of Sites: 0 - 2
* Geographical Distribution: Low
* Threat Containment: Easy
* Removal: Easy
Damage
* Damage Level: Low
* Payload: May download other threats on to the compromised computer.
Distribution
* Distribution Level: Low
TECHNICAL DETAILS
When the Trojan is executed, it creates the following files:
* %UserProifile%\Administrator\Local Settings\Temp\[ORIGINAL FILE NAME].exe
* %System%\regscan.exe
It then creates the following registry entries:
* HKEY_USERS\S-1-5-21-816139046-577266240-1678582812-500\Software\Microsoft\Internet Explorer\Settings\"GID" = "00 00 00 61"
* HKEY_USERS\S-1-5-21-816139046-577266240-1678582812-500\Software\Microsoft\Internet Explorer\Settings\"GatesList" ="63 72 69 74 69 63 61 6C 66 61 63 74 6F 72 2E 63 63 00 2F 63 67 69 2D 62 69 6E 2F 63 69 74 79 2E 63 67 69 00 61 6E 61 6D 61 6C 69 74 79 2E 69 6E 66 6F 00 2F 63 67 69 2D 62 69 6E 2F 62 61 6E 67 2E 63 67 69 00 77 69 72 65 64 78 2E 69 6E 00 2F 63 67 69 2D 62 69 6E 2F 64 62 2E 63 67 69 00"
* HKEY_USERS\S-1-5-21-816139046-577266240-1678582812-500\Software\Microsoft\Internet Explorer\Settings\"KeyM" = "94 6B EE BC FF A5 BB 8B 5E 68 2A A5 8F BF 24 F5 7A 63 B7 9C BB DB 14 D5 1F AE B0 57 34 02 59 6F C6 38 9C 7E BD 8F 82 02 9F 36 AB 3F 0C 6C B9 4C C3 98 7E E6 77 0A CC 53 20 6F 6B 5B EC 83 A8 9E 34 C1 9E 9C 73 93 05 01 F3 3D D2 DA 79 ED 63 00 04 25 CB 82 FC 87 3D 89 E1 86 79 79 8C 67 A8 43 5C BC 65 26 66 5E B1 8A C5 51 95 E0 24 B8 7F F5 1A 1C 20 83 DD B7 44 E6 E7 66 B3 5D 88 A7 85 C8 2B A4 58 4E 18 85 A2 9D D3 16 D5 89 E6 51 4B 70 90 C9 F3 82 69 13 F1 09 ED 7C 30 86 2A 16 4A 4C A4 06 FA F9 78 C4 7D 72 93 FC 64 D7 48 C5 FB 83 A2 44 0A 98 77 BE CD 4B FE A8 69 A2 16 F2 73 C5 F1 44 FF 11 38 3E AF 5F 3F 87 05 61 61 FC FF 22 BE 00 D5 46 67 A0 BA CE 65 A5 C7 32 03 93 11 96 62 7E EB 0B 5D 9D 9A 92 1B 41 10 8C 2C 9B 09 A5 11 84 EB 91 CA 34 18 0E 92 2D 85 C7 6B 02 B0 EF"
* HKEY_USERS\S-1-5-21-816139046-577266240-1678582812-500\Software\Microsoft\Internet Explorer\Settings\"KeyE" = "00 01 00 01"
The Trojan also creates the following registry entry, so that it starts when Windows starts:
HKEY_USERS\S-1-5-21-816139046-577266240-1678582812-500\Software\Microsoft\Windows\CurrentVersion\Run\"Regscan" = "C:\WINDOWS\system32\regscan.exe"
The Trojan then connects to the following URLs, where it may download further updates or other threats on to the compromised computer:
* [http://]anamality.info
* [http://]criticalfactor.cc
* [http://]wiredx.in
Recommendations
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":
* Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
* If a blended threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
* Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
* Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
* Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
* Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.
* Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
Source : Symantec.com
1 comments:
You have to wonder about virii reporting numbers. I work for a company that just got hammered by this thing, with an 80% infection rate, of a 12,000 machine environment. We actually had a variant, and had to inform symantec about it. Needless to say, they were very helpful in dealing with it.
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