Full description

Virus:	WORM/Dorkbot.K.1
Date discovered:	17/08/2011
Type:	Worm
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Medium
Damage Potential:	Medium
Static file:	Yes
File size:	114.688 Bytes
MD5 checksum:	74512C8219F3AED6C59E1187AA25E57A
VDF version:	7.11.13.117 - Wednesday, August 17, 2011
IVDF version:	7.11.13.117 - Wednesday, August 17, 2011

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

Aliases:
   • Kaspersky: Trojan.Win32.VBKrypt.cxzz
   • TrendMicro: TROJ_DLOADR.GHES
   • Microsoft: Trojan:Win32/Ircbrute
   • AhnLab: Trojan/Win32.Menti

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 One of the following values is added in order to run the process after reboot:

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

Server: **********smynew.info
Port: 1863
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++.

説明の挿入者 Andrei Ilie の 2011年10月19日水曜日
説明の更新者 Andrei Ilie の 2011年10月20日木曜日

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