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TSPY_ZBOT.YUYAFU

August 07, 2015
 ALIASES:

PWS:Win32/Zbot (Microsoft); Trojan-Spy.Win32.Zbot.vswa (Kaspersky); Troj/Inject-BPC (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Generic_r.FMM (AVG)

 PLATFORM:

Windows

 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:

168,448 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

07 Aug 2015

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.

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Uwvuc

HKEY_CURRENT_USER\Software\Microsoft\
Taehu

HKEY_CURRENT_USER\Software\Microsoft\
Take

HKEY_CURRENT_USER\Software\Microsoft\
Deumc

HKEY_CURRENT_USER\Software\Microsoft\
Viisw

HKEY_CURRENT_USER\Software\Microsoft\
Ykawb

Dropping Routine

This spyware drops the following files:

  • %Desktop%.pez
  • %Desktop%.xoi
  • %Desktop%.exe

(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

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
    • Uwvuc
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Taehu
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Take
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Deumc
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Viisw
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Ykawb

Step 3

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.
  • %Desktop%.pez
  • %Desktop%.xoi
  • %Desktop%.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.YUYAFU. 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.


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