Virus:WORM/Dorkbot.A.184
Date discovered:09/06/2011
Type:Worm
In the wild:No
Reported Infections:Low
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:236.544 Bytes
MD5 checksum:A8C24BE57021EDE8CB5C52EBF41022A3
VDF version:7.11.09.122 - Thursday, June 9, 2011
IVDF version:7.11.09.122 - Thursday, June 9, 2011

 General Method of propagation:
   • Autorun feature
   • Email
   • Messenger


Aliases:
   •  Kaspersky: Trojan.Win32.VBKrypt.deqp
   •  TrendMicro: WORM_DORKBOT.AKO
   •  Microsoft: Worm:Win32/Dorkbot


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows 7


Side effects:
   • Third party control
   • Blocks access to security websites
   • Drops files
   • Registry modification
   • Steals information

 Files It copies itself to the following location:
   • %APPDATA%\%random character string%.exe



It deletes the initially executed copy of itself.

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system]
   • "Shell"="explorer.exe,%APPDATA%\%random character%.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
   • "Shell"="explorer.exe,%APPDATA%\%random character%.exe"



To each registry key one of the values is added in order to run the processes after reboot:

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "%random character%"="%APPDATA%\%random character%.exe"

–  [HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run]
   • "%random character%"="%APPDATA%\%random character%.exe"

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "%random character%"="%APPDATA%\%random character%.exe"

 Messenger It is spreading via Messenger. The characteristics are described below:

– Windows Live Messenger
– Yahoo Messenger

 IRC To deliver system information and to provide remote control it connects to the following IRC Servers:

Server: **********.photomarket.me
Port: 1234
Nickname: %random character string%



– This malware has the ability to collect and send information such as:
    • Current user
    • Username
    • Information about the Windows operating system


– Furthermore it has the ability to perform actions such as:
    • connect to IRC server
    • Launch DDoS SYN flood
    • Launch DDoS UDP flood
    • disconnect from IRC server
    • Download file
    • Join IRC channel
    • Leave IRC channel
    • Perform DDoS attack
    • Restart system
    • Start spreading routine

 Stealing It tries to steal the following information:
– Passwords typed into 'password input fields'

– A logging routine is started after the following website is visited, which contains one of the following substrings in the URL:
   • .moneybookers.; 1and1.com; 4shared.com; alertpay.com; aol.;
      bcointernacional; bigstring.; depositfiles.; dotster.com; dyndns;
      enom.com; facebook.; fastmail.; fileserv.com; filesonic.com;
      freakshare.com; gmx.; godaddy.com; google.; hackforums.; hotfile.com;
      letitbit.net; login.live.; login.yahoo.; mediafire.com; megaupload.;
      members*.iknowthatgirl; members.brazzers.com; moniker.com;
      namecheap.com; netflix.com; netload.in; no-ip; officebanking.cl;
      oron.com; paypal.; runescape; screenname.aol.; secure.logmein.;
      sendspace.com; signin.ebay; sms4file.com; speedyshare.com;
      steampowered; thepiratebay.org; torrentleech.org; twitter.com;
      uploaded.to; uploading.com; vip-file.com; webnames.ru; what.cd; whcms;
      youporn.

– It captures:
    • Login information

 Injection – It injects itself as a remote thread into processes.

    All of the following processes:
   • alg.exe; chrome.exe; csrss.exe; explorer.exe; firefox.exe; flock.exe;
      ieuser.exe; iexplore.exe; msmsgs.exe; msnmsgr.exe; opera.exe;
      pidgin.exe; services.exe; smss.exe; spoolsv.exe; svchost.exe;
      winlogon.exe; wlcomm.exe; wuauclt.exe; %random process%



Purpose:
Access to the following websites is effectively blocked:
   • *avast.*; *avira.*; *bitdefender.*; *bullguard.*; *clamav.*;
      *comodo.*; *emsisoft.*; *eset.*; *f-secure.*; *fortinet.*;
      *garyshood.*; *gdatasoftware.*; *heck.tc*; *iseclab.*; *jotti.*;
      *kaspersky.*; *lavasoft.*; *malwarebytes.*; *mcafee.*; *norman.*;
      *norton.*; *novirusthanks.*; *onecare.live.*; *onlinemalwarescanner.*;
      *pandasecurity.*; *precisesecurity.*; *sophos.*; *sunbeltsoftware.*;
      *symantec*; *threatexpert.*; *trendmicro.*; *virscan.*; *virus.*;
      *virusbuster.nprotect.*; *viruschief.*; *virustotal.*; *webroot.*


 Miscellaneous Accesses internet resources:
   • api.wipmania.com

 File details Programming language:
 The malware program was written in MS Visual C++.

Description inserted by Andrei Ilie on Friday, September 30, 2011
Description updated by Andrei Ilie on Tuesday, October 4, 2011

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