New Nasty Windows Worm (Downadup, Conficker or Kido)

[ChaosOrb]

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I just got news yesterday that this worm is very rampant abroad Europe/US and it's coming to Asia, last Friday's statistics states that there are 8.9M infected, most of them are coming from corporate networks.

Read here for more ===> Nasty Windows Worm

[lestat1116]

atot ani oi. murag mao ni naka igo nako. na wipe out ako system restore.

any link para matang2x ni? or patch?

[Dondon]

Got hit by downadup pag new year, exactly new year.

[lestat1116]

Got hit by downadup pag new year, exactly new year.

how nimo pagremove?

[SmaRkieS]

@lestat

Diba nag buhat naman ka ug thread ani? Murag naka tubag man siguro ko didto.

[randzg]

invest nalang mo virus scanners or internet security..

[jOaL]

sorry double post.

[jOaL]

SYMPTOMS:
Connection times out while trying to access various antivirus related websites.
Windows Update has been disabled.
Presence of autorun.inf files in the root of mapped drives pointing to a .dll file inside the RECYCLER folder of the drive.

TECHNICAL DESCRIPTION:
Win32.Worm.Downadup is a worm that relies on the Microsoft Windows Server Service RPC Handling Remote Code Execution Vulnerability (MS08-67) in order to spread on other computers in the local network. The authors took various approaches to make this malware especially fast spreading and hard to remove.

This malware always comes wrapped in an obfuscated layer which aims at deterring analysis. The layer can be in two flavors, either packed with UPX or not packed, but it is always obfuscated and uses various rarely used apis to break emulators. The real malware is contained inside in an encrypted form. It is packed with a standard upx version, but to deter unpacking it is never written on disk and it doesn't have the PE header which makes it appear as an invalid executable. This has the side effect of being undetectable when injected into another process, it just looks as standard memory allocated page.

A computer can be infected by possible three means:
* if not patched with the latest security updates (in this case if MS08-67 vulnerability is not patched), by an already infected computer in the local network
* if the administrator account of the computer has a weak password (brute force dictionary attack against administrator password is used)
* if the computer has the Autoplay feature enabled and an infected mapped/removable drive stick is attached.

Once gained execution this worm does the following actions:
* hooks NtQueryInformationProcess from ntdll.dll inside the running process
* creates a named Mutex based on the computer name
* injects intself into one of the following processes:
* explorer.exe
* svchost.exe

* uses the following registry key to hide the files with hidden attributes:
* HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\exp lorer\Advanced\Folder\Hidden\SHOWALL\"CheckedValue " = "0"

* executes the following command, which disables auto-tuning (details) option under Windows Vista :
* netsh interface tcp set global autotuninglevel=disabled

* copies itself into one or more of the following locations:
* %Program Files%\Internet Explorer\[Random Name].dll
* %Program Files%\Movie Maker\[Random Name].dll
* %Documents and Settings%\All Users\Application Data\[Random Name].dll
* %Temp%\[Random Name].dll
* %System32%\[Random Name].dll

* if residing into services.exe application (Win2K) it hooks on the following apis:
* NetpwPathCanonicalize from netapi32.dll - this api is used to avoid reinfection of the local machine from other infected computers
* sendto from ws2_dll.dll

* if residing into svchost.exe it hooks the following apis
* NetpwPathCanonicalize from netapi32.dll - this api is used to avoid reinfection of the local machine from other infected computers
* DnsQuery_A, DnsQuery_W, DnsQuery_UTF8, Query_Main from dnsapi.dll - this apis are hooked to restrict access to various sites related to antivirus companies.

* it sets maximum number of simultaneous connections allowed by doing one of the following
* patching tcpip.sys driver, using a driver it drops itself (contained in an unencrypted form)
* setting HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Param eters\"TcpNumConnections" to "00FFFFFE"

* injects itself into services.exe (Win2K)

* it sets the following registry keys (if they are not set already), probably as an infection marker:
* HKCU\Software\Microsoft\Windows\CurrentVersion\App lets\"dl" = "0"
* HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\App lets\"dl" = "0"
* HKCU\Software\Microsoft\Windows\CurrentVersion\App lets\"ds" = "0"
* HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\App lets\"ds" = "0"

* Disabled the following Windows services:
* Background Intelligent Transfer Service (BITS)
* Windows Automatic Update Service (wuauserv)

* sets the following registry key to hide files with hidden attribute:
* HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\exp lorer\Advanced\Folder\Hidden\SHOWALL\"CheckedValue " = "0"

* enumerates all the available ADMIN$ network shares and tries to connect as an existing user using a list of weak passwords (essentially doing a dictionary attack on the user passwords). Examples of passwords from the available ones:
* academia
* access
* account
* Admin
* admin
* admin1
* admin12
* admin123
* adminadmin
* administrator
* anything
* asddsa
* asdfgh
* asdsa
* asdzxc
* backup
* boss123

If this attack is successful it copies itself into the share directory:
* ShareName\ADMIN$\System32\[Random Name].dll
To be sure the file is launched it creates a scheduled job on the attacked server, which is to run every day. The job looks like this:
* rundll32.exe [Random Name].dll, [Random String]

* it connects to the following URL's to get the address of the infected machine
* http://www.getmyip.org
* What's My IP Address
* http://getmyip.co.uk
* Current IP Check

This ip address, along with a random port number, is used to create a HTTP server which is used by the worm to infect using the MS08-67 vulnerability. The infected computers which connect to that ip and port will be exploited and forced to download a copy of the malware hidden with a random name and with one of the following extensions:
* png
* bmp
* jpg
* gif

* it monitors remote and removable drives for infection using the Autoplay feature:
* a copy of the file is placed inside a random folder (created by the malware) : :\RECYCLER\S-%d-%d-%d-%d%d%d-%d%d%d-%d%d%d-%d\[Random Name].dll
* an obfuscated autorun.inf file is generated used to launch the malware from the above location. The file is obfuscated by adding random commentaries, with random length.

* Using the apis hooked from dnsapi.dll it denies (error timed out) access to sites containing one of the following strings:
* virus
* spyware
* malware
* rootkit
* defender
* microsoft
* symantec
* norton
* mcafee
* trendmicro
* sophos
* panda
* etrust
* networkassociates
* computerassociates
* f-secure
* kaspersky
* jotti
* f-prot
* nod32
* eset
* grisoft
* drweb
* centralcommand
* ahnlab
* esafe
* avast
* avira
* quickheal
* comodo
* clamav
* ewido
* fortinet
* gdata
* hacksoft
* hauri
* ikarus
* k7computing
* norman
* pctools
* prevx
* rising
* securecomputing
* sunbelt
* emsisoft
* arcabit
* cpsecure
* spamhaus
* castlecops
* threatexpert
* wilderssecurity
* windowsupdate
* nai.
* ca.
* avp.
* avg.
* vet.
* bit9.
* sans.
* cert.

* connects to one of the following sites to get the current date (day and month) (HTTP_QUERY_DATE)
* w3.org
* ask.com
* yahoo.com
* google.com
* baidu.com

* using the information gathered in the previous step it generates a list of possible update sites with this format:
* http://[Date Base Name].[Random Domain]/search?q=%d
* domain name can be:
* .biz
* .info
* .org
* .net
* .com
* .ws
* .cn
* .cc

* examples of domains generated for 9 January 2009
* opphlfoak.info
* mphtfrxs.net
* hcweu.org
* tpiesl.info
* bmqyp.com
* aqnjou.info
* kxxprzab.net
* gjbueqbdb.com
* qkccgprsp.net
* yjxraefn.org
* civmakjl.net
* ygmjyyzbj.info
* ulptholvr.org
* dqyusn.info
* gsvfy.org
* sjdvt.net
* tizkywcd.com
* bkqxwccwseo.org
* bmrmgxv.com
* xlkfp.org
* pvfesejm.com

These domains most probably contain updates of the worm or other malware related to it.

* deletes all the System Restore points prior to infection.

* The worm protects itself from deletion by removing all NTFS file permissions,except execute and directory traversal, from all users.




Removal instructions:
To remove Win32.Worm.Downadup.Gen please follow the instructions below:
* disable System Restore
* unplug network cable from infected machine
* download MS08-67 vulnerability fix, according to your operating system version from the following url: Microsoft Security Bulletin MS08-067 – Critical: Vulnerability in Server Service Could Allow Remote Code Execution (958644)
* run attached removal tool
* restart computer
* plug in your network cable
* update BitDefender virus definitions
* perform BitDefender Full System Scan.


ANALYZED BY:
Daniel Radu - Virus Researcher, Mihai Cimpoesu - Virus Researcher

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[lestat1116]

this is the one. naka infect nako. damn. gahi.a jud ani.

how to disable system restore? wer can i find ang atached removeal ani?

[COMCAM]

Prevent it, install spybot search and destroy. Any changes to your system, spybot alerts you first so that you can choose deny changes.