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Its always interesting around the ISC and you'll never know what you'll be handed on any given day. Its even more interesting when there is an unpatched IE vulnerability and an exploit available for it. That is where we find ourselves now. There are several sites that have been compromised and now contain the exploit code. These sites all run the exploit code and get a file called ca.exe which in turn gets a file called calc.exe and installs it. It is calc.exe that we want to focus on briefly.
This malware installs a dll that is used as a Browser Helper Object (BHO) and also runscopies itself to directory you see below as nm32.exe and runs as a process. The malware creates the following on install: C:\WINNT\fyt\mn32.dll C:\WINNT\fyt\nm32.exe C:\WINNT\fyt\~ipcfg636 C:\WINNT\fyt\~start636 C:\WINNT\fyt\~tmp636 C:\WINNT\fyt\~view636 It also creates one called sub.txt when you surf the internet and records everything that it can about where you surf and do and any information it can get from the Let's look at what is in the files. The information I'm about to show is from my VM box, so it won't get you anywhere:>) File: ipcfg636 Windows 2000 IP Configuration Host Name . . . . . . . . . . . . : vmwindows2k Primary DNS Suffix . . . . . . . : Node Type . . . . . . . . . . . . : Broadcast IP Routing Enabled. . . . . . . . : No WINS Proxy Enabled. . . . . . . . : No Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : Description . . . . . . . . . . . : AMD PCNET Family PCI Ethernet Adapter Physical Address. . . . . . . . . : 00-0C-29-16-36-AB DHCP Enabled. . . . . . . . . . . : No IP Address. . . . . . . . . . . . : 192.168.227.128 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : DNS Servers . . . . . . . . . . . : File: start636 Active Connections Proto Local Address Foreign Address State TCP 0.0.0.0:135 0.0.0.0:0 LISTENING TCP 0.0.0.0:445 0.0.0.0:0 LISTENING TCP 0.0.0.0:1025 0.0.0.0:0 LISTENING TCP 0.0.0.0:1027 0.0.0.0:0 LISTENING TCP 192.168.227.128:139 0.0.0.0:0 LISTENING UDP 0.0.0.0:135 *:* UDP 0.0.0.0:445 *:* UDP 0.0.0.0:1026 *:* UDP 192.168.227.128:137 *:* UDP 192.168.227.128:138 *:* UDP 192.168.227.128:500 *:* File: tmp636 Protected Storage settings / PWL: InfoDelivery IdentityMgr IdentitiesPass ::::?:ϻb[ HASH values: Administrator:500:AF6E956C6F6836C4F3F9505A2D0958A7:0B14980C258F0D7178186CE65030A4A6:Built-in account for administering the computer/domain:: Guest:501:********************************:********************************:Built-in account for guest access to the computer/domain:: RAS: Total 0 entries Network settings: File: view636 Server Name Remark ------------------------------------------------------------------------------- \\VMWINDOWS2K The command completed successfully. File: Sub.txt res://C:\WINNT\system32\shdoclc.dll/dnserror.htm#http://www.msn.com/ http://winxphome/index.html http://winxphome/index.html http://winxphome/index.html email=lorna.hutcheson@somewhere.com pw=password pw-conf=password The malware FTP's all the information out to a location. It also has email capability. The location given by McAfee in their writeup found here was as follows: "The trojan attempts to upload harvested information to an FTP server (66.242.129.251)." However, when I downloaded the malware and looked at it that was not the location I found in the strings. I found: 0040F530 ASCII "200.182.57.13",0 0040F630 ASCII "21",0 So its seems that the malware has been swapped for a new version with the FTP server portion being changed. I have not observed it attempting to FTP yet, still waiting with a sniffer running. The strings also contained the username and password for the new site. The file on the new IP is now encrypted and the file wasn't before on the first FTP site. So the individual seems to realize that folks are on to them. I'm pretty sure that the malware has just been changed since its easier to modify the malware and where it FTPs to than to go back to all the hacked sites. Anyway, please keep your eyes and ears open for any new sites exploiting this vulnerability! As always, be careful its a jungle out there! Lorna J. Hutcheson CACI |
Lorna 165 Posts ISC Handler |
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Mar 26th 2006 1 decade ago |
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