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Virus Profile: PWS-Zbot.gen.hv

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 7/8/2011
Date Added: 7/8/2011
Origin: N/A
Length: varies
Type: Trojan
Subtype: Generic
DAT Required: 6401
Removal Instructions
   
 
 
   

Description

This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Aliases –

    • Ikarus - Trojan-Downloader.Win32.Carberp
    • Kaspersky - HEUR:Trojan.Win32.Generic
    • Microsoft - TrojanDownloader:Win32/Carberp.C
    • NOD32 - a variant of Win32/Kryptik.UDR

Indication of Infection

Presence of above mentioned files and registry keys

Presence unexpected network connection to the above mentioned IP Address.

These symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

Methods of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.

 

   

Virus Characteristics

--Updated on 29th June 2012---

Aliases

  • Microsoft            -        Worm:Win32/Cridex.E
  • Kaspersky           -        Trojan-Dropper.Win32.Dapato.bjvs
  • Ikarus                  -        Trojan-Dropper.Win32.Dapato
  • Symantec             -        W32.Cridex

When executed the Trojan copies itself into the following location.

%Appdata%\KB01154634.exe

It drops the below script file

%temp%\exp5.tmp.BAT

After execution, the Trojan deletes self by using above script file from the compromised system

Below mentioned registry ensures that, the Trojan registers itself with the compromised system and execute itself upon every boot.

HKEY_CURRENT_USER\ Software\Microsoft\Windows\CurrentVersion\Run:"KB01154634.exe"  =  “%Appdata%\KB01154634.exe” 

It  also tries to connect to the following ip location

123.[removed].61.59

Notes: - [C:\Documents and Settings\All Users\ - %AllUsersprofile%, C:\DOCUME~1\Admin\LOCALS~1\Temp - %Temp%,C:\Documents and Settings\Admin\Application Data - %Appdata%,c: - %systemdrive%,C:\Documents and Settings\Administrator - %Userprofile%]

-------------------------------------------------------------------------------------------------------------------------------------------------------------------

--Updated on January 23, 2012---

Aliases -

  • Kaspersky - Trojan-Spy.Win32.Zbot.cqab
  • NOD32    - a variant of Win32/Kryptik.WEE
  • Ikarus      - Trojan-Spy.Win32.Zbot
  • Microsoft - PWS:Win32/Zbot

Upon execution Trojan injects itself with Explorer.exe and connects to the following site sec[Removed]ert.ru through a remote port 80 to download other malicious files.

The following files have been added to the system.

  • %UserProfile%\Application Data\Identities\{64DD4488-B7D5-4C11-8D65-6BAF648A65EB}\Microsoft\Outlook Express\Folders.dbx
  • %UserProfile%\Application Data\Identities\{64DD4488-B7D5-4C11-8D65-6BAF648A65EB}\Microsoft\Outlook Express\Inbox.dbx
  • %UserProfile%\Application Data\Identities\{64DD4488-B7D5-4C11-8D65-6BAF648A65EB}\Microsoft\Outlook Express\Offline.dbx
  • %UserProfile%\Application Data\Identities\{64DD4488-B7D5-4C11-8D65-6BAF648A65EB}\Microsoft\Outlook Express\Sent Items.dbx
  • %Appdata%\Microsoft\Address Book\[User].wab
  • %Appdata%\Microsoft\Address Book\[User].wab~
  • %Appdata%\Ucyha\zoowqi.exe
  • %Appdata%\Omkaiv\taihubu.tmp
  • %Appdata%\Omkaiv\taihubu.ist

The following registry keys have been added to the system.

  • HKEY_USERS\S-1-5-[varies]\Identities\{64DD4488-B7D5-4C11-8D65-6BAF648A65EB}\Software\Microsoft\Outlook Express\5.0\Mail
  • HKEY_USERS\S-1-5-[varies]\Identities\{64DD4488-B7D5-4C11-8D65-6BAF648A65EB}\Software\Microsoft\Outlook Express\5.0\News
  • HKEY_USERS\S-1-5-[varies]\Identities\{64DD4488-B7D5-4C11-8D65-6BAF648A65EB}\Software\Microsoft\Outlook Express\5.0\Rules
  • HKEY_USERS\S-1-5-[varies]\Identities\{64DD4488-B7D5-4C11-8D65-6BAF648A65EB}\Software\Microsoft\Outlook Express\5.0\Rules\Mail
  • HKEY_USERS\S-1-5-[varies]\Identities\{64DD4488-B7D5-4C11-8D65-6BAF648A65EB}\Software\Microsoft\Outlook Express\5.0\Trident
  • HKEY_USERS\S-1-5-[varies]\Identities\{64DD4488-B7D5-4C11-8D65-6BAF648A65EB}\Software\Microsoft\Outlook Express\5.0\Trident\Main
  • HKEY_USERS\S-1-5-[varies]\Identities\{64DD4488-B7D5-4C11-8D65-6BAF648A65EB}\Software\Microsoft\Outlook Express\5.0\Trident\Settings
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Explorer\Privacy
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Rivib

The following registry values have been added to the system.

  • [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\]
    %Windir%\EXPLORER.EXE = "%Windir%\EXPLORER.EXE = *:Enabled:Windows Explorer"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Explorer\Privacy\CleanCookies = 0x00000000

The above mentioned registry ensures that, the Trojan disables the option for clearing the Internet Explorer cookies.

  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Windows\CurrentVersion\Run]
    {709C0C2E-AA1E-83E0-9ECE-7BB26FA662F2} = ""%Appdata%\Ucyha\zoowqi.exe""

The above mentioned registry ensures that, the Trojan registers run entry with the compromised system and execute itself upon every boot.

It creates the following mutex.

  • {1BAF61A0-C790-E8D3-9ECE-7BB26FA662F2}

[Note: C:\WINDOWS is %Windir%,C:\Documents and Settings\[User]\Application Data is %Appdata%,C:\Documents and Settings\Naveen\Local Settings is %UserProfile%]

 

-----Updated on Nov 10 , 2011-----------

Aliases -

  • Kaspersky - Trojan-Spy.Win32.Zbot.cntc
  • NOD32    - Win32/Spy.Zbot.YW
  • Ikarus - Trojan-Spy.Win32.Zbot
  • Microsoft - PWS:Win32/Zbot

Upon execution the Trojan injects with explorer.exe and connects to the following site [removed]ndconcert.ru through remote port 80 to download other malicious files.

The following files have been added to the system.

  • %Appdata%\Aqyhn\fadaytp.exe
  • %Appdata%\Weheety\fyepox.tmp

The following registry keys have been added to the system.

  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Explorer\Privacy
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Active Directory GC
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Ircih

The following registry Values have been added to the system.

  • [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List]
    %WinDir%\EXPLORER.EXE = "%WinDir%\EXPLORER.EXE:*:Enabled:Windows Explorer"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Explorer\Privacy\CleanCookies = 0x00000000

The above mentioned registry ensures that, the Trojan disables the option for clearing the Internet Explorer cookies.

  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Windows\CurrentVersion\Run]
    {709C0C2E-AA1E-83E0-9ECE-7BB26FA662F2} = ""%Appdata%\Aqyhn\fadaytp.exe""

The above mentioned registry ensures that, the Trojan registers run entry with the compromised system and execute itself upon every boot.

  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere\LDAP Server ID = 0x00000003
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere\Account Name: "WhoWhere Internet Directory Service"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere\LDAP Server = "ldap.whowhere.com"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere\LDAP URL = "http://www.whowhere.com"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere\LDAP Search Return = 0x00000064
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere\LDAP Timeout = 0x0000003C
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere\LDAP Authentication = 0x00000000
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere\LDAP Simple Search = 0x00000001
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\WhoWhere\LDAP Logo = "%ProgramFiles%\Common Files\Services\whowhere.bmp"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign\LDAP Server ID = 0x00000002
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign\Account Name = "VeriSign Internet Directory Service"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign\LDAP Server = "directory.verisign.com"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign\LDAP URL = "http://www.verisign.com"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign\LDAP Search Return = 0x00000064
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign\LDAP Timeout = 0x0000003C
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign\LDAP Authentication = 0x00000000
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign\LDAP Search Base = "NULL"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign\LDAP Simple Search = 0x00000001
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\VeriSign\LDAP Logo = "%ProgramFiles%\Common Files\Services\verisign.bmp"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot\LDAP Server ID = 0x00000001
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot\Account Name = "Bigfoot Internet Directory Service"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot\LDAP Server = "ldap.bigfoot.com"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot\LDAP URL = "http://www.bigfoot.com"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot\LDAP Search Return = 0x00000064
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot\LDAP Timeout = 0x0000003C
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot\LDAP Authentication = 0x00000000
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot\LDAP Simple Search = 0x00000001
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Account Manager\Accounts\Bigfoot\LDAP Logo = "%ProgramFiles%\Common Files\Services\bigfoot.bmp"
  • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Ircih\Begy = [binary data]

The Following folders were added to the system.

  • %Appdata%\Aqyhn
  • %Appdata%\Weheety

[Note: C:\Documents and Settings\User\Application Data is %Appdata% , C:\WINDOWS is %WinDir%,%SystemDrive% is the drive where the Operating System is installed, in most cases it will be C:\]

------------------------------------

Upon execution, the Trojan copies itself into the below mentioned location and connects to the IP address 46.19.[removed] through remote port 80 to download further malicious files.

    • %UserProfile%\Start Menu\Programs\Startup\igfxtray.exe
    • %Temp%/6.tmp

The Trojan executes upon every Windows Start Up.

And drops the following non malicious file

    • %AppData%\wndsksi.inf

The Trojan connects to the remote site to perform the following actions

    • To report a new infection to its author
    • To receive configuration or other data
    • To download and execute arbitrary files (including updates or additional malware)
    • To receive instruction from a remote attacker
    • To upload data taken from the affected computer

The following registry value has been added

    • HKEY_USERS\S-1-5-[varies]\Software\Microsoft\Internet Explorer\Main\
      TabProcGrowth = “0"

The following registry values have been modified

    • HKEY_LOCAL_MACHINE\ S-1-5-[varies]\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3\
      1609 = 0x00000000

The following folder has been added

    • %AppData%\MicroST

Note –

[%UserProfile% - C:\Documents and Settings\[UserName],
%Temp% - C:\Documents and Settings\[UserName]\Local Settings\Temp,
%AppData% - C:\Documents and Settings\[UserName]\Application Data]

 

   

All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).