Internet threat level: 1
Home→Descriptions→Net-Worm.Win32.Kido.fx
Net-Worm.Win32.Kido.fx
| Detected | Jan 05 2009 20:29 GMT |
| Released | Jan 06 2009 00:06 GMT |
| Published | Jan 21 2009 14:19 GMT |
Payload
Removal instructions
Technical Details
This malicious program exploits the MS08-067 vulnerability to spread via network resources and removable storage media.
This modification of the worm is a Windows PE DLL file. The file is 158110 bytes in size. It is packed using UPX.
Installation
The worm copies its executable file with random names to the following directories:
%System%\<rnd>dir.dll %Program Files%\Internet Explorer\<rnd>.dll %Program Files%\Movie Maker\<rnd>.dll %All Users Application Data%\<rnd>.dll %Temp%\<rnd>.dll %System%\<rnd>tmp %Temp%\<rnd>.tmp
<rnd> is a random string of symbols.
In order to ensure that the worm is launched next time the system is started, it creates a system service which launches the worm’s executable file each time Windows is booted. The following registry key will be created:
The name of the service will be created from combining words from the list below:
Boot Center Config Driver Helper Image Installer Manager Microsoft Monitor Network Security Server Shell Support System Task Time Universal Update Windows
The worm also modifies the following system registry key value:
The worm hides its files in Explorer by modifying the registry key value shown below:
"Hidden" = "dword: 0x00000002"
"SuperHidden" = "dword: 0x00000000"
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL]
"CheckedValue" = "dword: 0x00000000"
The worm flags its presence in the system by creating the unique identifier shown below:
Propagation
In order to spread quickly via networks, the worm uses tcpip.sys functions to increase the number of potential network connections.
The worm connects to the servers shown below in order to determine the external IP address of the victim machine:
http://www.getmyip.org http://www.whatsmyipaddress.com http://www.whatismyip.org http://checkip.dyndns.org
The worm then launches an HTTP server on a random TCP port; this is then used to download the worm's executable file to other computers.
Copies of the worm have the extensions listed below:
.bmp .gif .jpeg .png
The worm gets the IP addresses of computers in the same network as the victim machine and attacks them via a buffer overrun vulnerability (MS08-067) in the Server service. More details about the vulnerability can be found here: www.microsoft.com/technet/security/Bulletin/MS08-067.mspx. The worm sends a specially crafted RPC request to TCP ports 139 (NetBIOS) and 445 (Direct hosted SMB) remote machines on remote machines. This causes a buffer overrun when the wcscpy_s function is called in netapi32.dll, which launches code that downloads the worm's executable file to the victim machine and launches it. The worm is then installed on the new victim machine.
The worm then hooks the NetpwPathCanonicalize API call (netapi.dll) to prevent buffer overruns caused by the absence of a check on the size of outgoing strings. By doing this, the worm makes repeat exploitation of the vulnerability impossible.
In order to speed up propagation, the worm modifies the following registry value:
"TcpNumConnections" = "dword:0x00FFFFFE"
In order to exploit the vulnerability described above, the worm attempts to connect to the Administrator account on the remote machine. It searches the network for an appropriate machine and gets a list of users. It then attempts to brute force each user account using the passwords shown below:z
99999999 9999999 999999 99999 9999 999 99 9 88888888 8888888 888888 88888 8888 888 88 8 77777777 7777777 777777 77777 7777 777 77 7 66666666 6666666 666666 66666 6666 666 66 6 55555555 5555555 555555 55555 5555 555 55 5 44444444 4444444 444444 44444 4444 444 44 4 33333333 3333333 333333 33333 3333 333 33 3 22222222 2222222 222222 22222 2222 222 22 2 |
11111111 1111111 111111 11111 1111 111 11 1 00000000 0000000 00000 0000 000 00 0987654321 987654321 87654321 7654321 654321 54321 4321 321 21 12 fuck zzzzz zzzz zzz xxxxx xxxx xxx qqqqq qqqq qqq aaaaa aaaa aaa sql file web foo job home work intranet controller killer games private market coffee cookie forever freedom student account academia files windows monitor |
unknown anything letitbe letmein domain access money campus explorer exchange customer cluster nobody codeword codename changeme desktop security secure public system shadow office supervisor superuser share super secret server computer owner backup database lotus oracle business manager temporary ihavenopass nothing nopassword nopass Internet internet example sample love123 boss123 work123 home123 mypc123 temp123 test123 qwe123 abc123 pw123 root123 pass123 pass12 pass1 admin123 admin12 admin1 |
password123 password12 password1 default foobar foofoo temptemp temp testtest test rootroot root adminadmin mypassword mypass pass Login login Password password passwd zxcvbn zxcvb zxccxz zxcxz qazwsxedc qazwsx q1w2e3 qweasdzxc asdfgh asdzxc asddsa asdsa qweasd qwerty qweewq qwewq nimda administrator Admin admin a1b2c3 1q2w3e 1234qwer 1234abcd 123asd 123qwe 123abc 123321 12321 123123 1234567890 123456789 12345678 1234567 123456 12345 1234 123 |
In order to gain administrator access, the worm copies itself to the following shared folders:
\\<name of host>\IPC$\<rnd>.<rnd>
The worm can then be launched remotely or scheduled for remote launch using the following commands:
Spreading via removable storage media
The worm copies its executable file to all removable media under the following name:
%d%>-%d%>\<rnd>.vmx, rnd is a string of random lower case letters; d is a random number; X
is the disk
In addition to its executable file, the worm also places the file shown below in the root of every disk:
This file will launch the worm's executable file each time Explorer is used to open the infected disk.
Payload
When launching, the worm injects its code into the address space of one of the “svchost.exe” system processes. (The worm may also write its code to the “explorer.exe” and “services.exe” processes.) This code delivers the worm's main malicious payload and:
- disables the following services:
Windows Automatic Update Service (wuauserv) Background Intelligent Transfer Service (BITS) Windows Security Center Service (wscsvc) Windows Defender Service (WinDefend, WinDefender) Windows Error Reporting Service (ERSvc) Windows Error Reporting Service (WerSvc)
- blocks access to addresses which contain any of the strings listed below:
nai ca avp avg vet bit9 sans cert windowsupdate wilderssecurity threatexpert castlecops spamhaus cpsecure arcabit emsisoft sunbelt securecomputing rising prevx pctools norman k7computing ikarus hauri hacksoft gdata fortinet ewido clamav comodo quickheal avira avast esafe ahnlab centralcommand drweb grisoft eset nod32 f-prot jotti kaspersky f-secure computerassociates networkassociates etrust panda sophos trendmicro mcafee norton symantec microsoft defender rootkit malware spyware virus
In Windows Vista, the worm will disable autoconfiguration of the TCP/IP stack in order to speed up propagation via network channels by using a fixed window size for TCP packets:
The worm also hooks the following API calls (dnsrslvr.dll) in order to block access to the list of user domains:
DNS_Query_A DNS_Query_UTF8 DNS_Query_W Query_Main sendto
The worm may also download files from links of the type shown below:
rnd2 is a random number; URL is a link generated by a special algorithm which uses the current date. The worm gets the current date from one of the sites shown below:
http://www.w3.org http://www.ask.com http://www.msn.com http://www.yahoo.com http://www.google.com http://www.baidu.com http://www.myspace.com http://www.msn.com http://www.ebay.com http://www.cnn.com http://www.aol.com
Downloaded files are saved to the Windows system directory under their original names.
Removal instructions
If your computer does not have an up-to-date antivirus solution, or does not have an antivirus solution at all, you can either use a special removal tool (which can be found here or follow the instructions below:
http://www.kaspersky.ru/support/wks6mp3/error?qid=208636215
Or follow the instructions below:
- Delete the following system registrykey:
[HKLM\SYSTEM\CurrentControlSet\Services\netsvcs]
- Delete “%System%\<rnd>.dll” from the system registry key value shown below:
[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost]
"netsvcs" - Revert the following registry key values:
[HKCR\ Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
"Hidden" = "dword: 0x00000002"
"SuperHidden" = "dword: 0x00000000"to
[HKCR\ Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
"Hidden" = "dword: 0x00000001"
"SuperHidden" = "dword: 0x00000001"[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL]
"CheckedValue" = "dword: 0x00000000"to
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL]
"CheckedValue" = "dword: 0x00000001" - Reboot the computer.
- Delete the original worm file (the location will depend on how the program originally penetrated the victim machine).
- Delete copies of the worm:
%System%\<rnd>dir.dll %Program Files%\Internet Explorer\<rnd>.dll %Program Files%\Movie Maker\<rnd>.dll %All Users Application Data%\<rnd>.dll %Temp%\<rnd>.dll %System%\<rnd>tmp %Temp%\<rnd>.tmp
<rnd> is a random string of symbols. - Delete the files shown below from all removable storage media:
<X>:\autorun.inf
<X>:\RECYCLER\S-<%d%>-<%d%>-%d%>-%d%>-%d%>-%d%>-
%d%>\<rnd>.vmx, - Download and install updates for the operating system:
http://www.microsoft.com/technet/security/Bulletin/MS08-067.mspx
- Update your antivirus databases and perform a full scan of the computer (download a trial version of Kaspersky Anti-Virus).
Net-Worms propagate via computer networks. The distinguishing feature of this type of worm is that it does not require user action in order to spread.
This type of worm usually searches for critical vulnerabilities in software running on networked computers. In order to infect the computers on the network, the worm sends a specially crafted network packet (called an exploit) and as a result the worm code (or part of the worm code) penetrates the victim computer and activates. Sometimes the network packet only contains the part of the worm code which will download and run a file containing the main worm module. Some network worms use several exploits simultaneously to spread, thus increasing the speed at which they find victims.
Net-Worm.
- Virus:
W32/Conficker. worm. gen. a (McAfee) - Mal/Conficker-A (Sophos)
- Worm.
Kido-113 (ClamAV) - W32/Conficker.
C. worm (Panda) - W32/Conficker!Generic (FPROT)
- Win32.
HLLW. Shadow. based (DrWeb) - Win32/Conficker.
AE (Nod32) - Win32.
Worm. Downadup. Gen (BitDef7) - Trojan.
Conficker. Gen!Pac (VirusBuster) - Win32:
Confi [Wrm] (AVAST) - Net-Worm.
Win32. Kido (Ikarus) - Worm/Downadup (AVG)
- Hack.
Exploit. Win32. MS08-067. fc (Rising) - Worm:
W32/Downadup. BN [Orion] (FSecure) - WORM_DOWNAD.
AD (TrendMicro)
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