ALIASES:

PWS:Win32/Zbot (Microsoft); Trojan-Spy.Win32.Zbot.biwp (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 1,012,059 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 07 Dec 2012

Arrival Details

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This spyware creates the following folders:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Profile%\Application Data\Utimor
  • %User Profile%\Application Data\Weanob

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other System Modifications

This spyware deletes the following files:

  • %User Temp%\nsz1.tmp
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\XRegistry.bin
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\XRegistry.bin

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Ekuzip

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders
AppData = "%User Profile%\Application Data"

(Note: The default value data of the said registry entry is %User Profile%\Application Data.)

Dropping Routine

This spyware drops the following files:

  • %User Temp%\orderspecification1.exe
  • %Application Data%\Xenocode
  • %Application Data%\Xenocode\Sandbox
  • %Application Data%\Xenocode\Sandbox\1.0.0.0
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS\Manifests
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS\Manifests\VmX.dll_0x8C9DF666D50A4D841E2DCEE9556484BF.2.manifest
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS\Xenocode.VMX@1.0.0.0
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS\Xenocode.VMX@1.0.0.0\Xenocode.VMX.manifest
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS\Xenocode.VMX@1.0.0.0\Xenocode.VMX@1.0.0.0.manifest
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS\Manifests
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS\Manifests\VmX.dll_0x8C9DF666D50A4D841E2DCEE9556484BF.2.manifest
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS\Xenocode.VMX@1.0.0.0
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS\Xenocode.VMX@1.0.0.0\Xenocode.VMX.manifest
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS\Xenocode.VMX@1.0.0.0\Xenocode.VMX@1.0.0.0.manifest
  • %User Profile%\Application Data\Utimor
  • %User Profile%\Utimor\yxyw.exe
  • %User Profile%\Application Data\Weanob
  • %User Profile%\Weanob\yrsel.zoi
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@\Utimor
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@\Utimor\yxyw.exe
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@\Utimor
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@\Utimor\yxyw.exe
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@SYSTEM@
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@SYSTEM@\cmd.exe
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@SYSTEM@
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@SYSTEM@\cmd.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.300

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft
    • Ekuzip

Step 3

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
    • From: AppData = "%User Profile%\Application Data"
      To: AppData = ""%User Profile%\Application Data""

Step 4

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\orderspecification1.exe
  • %Application Data%\Xenocode
  • %Application Data%\Xenocode\Sandbox
  • %Application Data%\Xenocode\Sandbox\1.0.0.0
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS\Manifests
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS\Manifests\VmX.dll_0x8C9DF666D50A4D841E2DCEE9556484BF.2.manifest
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS\Xenocode.VMX@1.0.0.0
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS\Xenocode.VMX@1.0.0.0\Xenocode.VMX.manifest
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\SXS\Xenocode.VMX@1.0.0.0\Xenocode.VMX@1.0.0.0.manifest
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS\Manifests
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS\Manifests\VmX.dll_0x8C9DF666D50A4D841E2DCEE9556484BF.2.manifest
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS\Xenocode.VMX@1.0.0.0
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS\Xenocode.VMX@1.0.0.0\Xenocode.VMX.manifest
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\SXS\Xenocode.VMX@1.0.0.0\Xenocode.VMX@1.0.0.0.manifest
  • %User Profile%\Application Data\Utimor
  • %User Profile%\Utimor\yxyw.exe
  • %User Profile%\Application Data\Weanob
  • %User Profile%\Weanob\yrsel.zoi
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@\Utimor
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@\Utimor\yxyw.exe
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@\Utimor
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@APPDATA@\Utimor\yxyw.exe
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@SYSTEM@
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@SYSTEM@\cmd.exe
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@SYSTEM@
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Native\STUBEXE\@APPDATALOCAL@\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Native\STUBEXE\@SYSTEM@\cmd.exe

Step 5

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\ADMINI~1
  • %User Profile%\LOCALS~1
  • %User Profile%\Application Data\Utimor
  • %User Profile%\Application Data\Weanob

Step 6

Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.ACD. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 7

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\nsz1.tmp
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.47\Virtual\XRegistry.bin
  • %Application Data%\Xenocode\Sandbox\1.0.0.0\2012.12.03T21.46\Virtual\XRegistry.bin


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