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TrojanSpy.MSIL.ZBOT.AD

February 19, 2020
 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan Spy 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:

557,568 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

19 Feb 2020

Arrival Details

This Trojan Spy 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 Trojan Spy adds the following processes:

  • "{malware file path and name}"
  • "%Application Data%\Sukyymilcovu\ibxypoumif.exe"

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It creates the following folders:

  • %Application Data%\Sukyymilcovu
  • %Application Data%\Odneusmy
  • %Application Data%\Riryzaothiem

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Autostart Technique

This Trojan Spy adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Ywakd = "%Application Data%\Sukyymilcovu\ibxypoumif.exe"

Other System Modifications

This Trojan Spy modifies the following file(s):

  • %AppDataLocal%\Microsoft\Windows\WebCache\V01.log
  • %AppDataLocal%\Microsoft\Windows\WebCache\WebCacheV01.dat

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It deletes the following files:

  • {malware file path and name}
  • %AppDataLocal%\Microsoft\Windows\WebCache\res2.log
  • %Application Data%\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\settings.sol
  • %AppDataLocal%\Microsoft\Windows\WebCache\V01tmp.log
  • %AppDataLocal%\Microsoft\Windows\WebCache\res1.log
  • %Application Data%\Microsoft\SystemCertificates\My\Certificates\DB456BD957FC05675172FD6EE3D6566A49AAA614

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Ovaho
Ymehebre = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
Ovaho
Lyfa = "{random characters}"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run\
internat.exe

Dropping Routine

This Trojan Spy drops the following files:

  • %Application Data%\Sukyymilcovu\ibxypoumif.exe
  • %Application Data%\Riryzaothiem\amhutafobe.tmp
  • %AppDataLocal%\Microsoft\Windows\WebCache\V01.chk
  • %Application Data%\Odneusmy\owvuduaxcem.hiv
  • %AppDataLocal%\Microsoft\Windows\WebCache\WebCacheV01.tmp
  • %AppDataLocal%\Microsoft\Windows\WebCache\V01.log
  • %AppDataLocal%\Microsoft\Windows\WebCache\WebCacheV01.dat
  • %Application Data%\Riryzaothiem\amhutafobe.duo

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Trojan Spy connects to the following possibly malicious URL:

  • http://{BLOCKED}rem.com/arpege/wp-includes/panel/file.php

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Identify and terminate files detected as TrojanSpy.MSIL.ZBOT.AD

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Delete this registry value

[ 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\Windows\CurrentVersion\Run
    • Ywakd = "%Application Data%\Sukyymilcovu\ibxypoumif.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Ovaho
    • Ymehebre = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Ovaho
    • Lyfa = "{random characters}"

Step 5

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.
  • %Application Data%\Sukyymilcovu\ibxypoumif.exe
  • %Application Data%\Riryzaothiem\amhutafobe.tmp
  • %AppDataLocal%\Microsoft\Windows\WebCache\V01.chk
  • %Application Data%\Odneusmy\owvuduaxcem.hiv
  • %AppDataLocal%\Microsoft\Windows\WebCache\WebCacheV01.tmp
  • %AppDataLocal%\Microsoft\Windows\WebCache\V01.log
  • %AppDataLocal%\Microsoft\Windows\WebCache\WebCacheV01.dat
  • %Application Data%\Riryzaothiem\amhutafobe.duo

Step 6

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.
  • %Application Data%\Sukyymilcovu
  • %Application Data%\Odneusmy
  • %Application Data%\Riryzaothiem

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.MSIL.ZBOT.AD. 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 8

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

    • %AppDataLocal%\Microsoft\Windows\WebCache\V01.log
    • %AppDataLocal%\Microsoft\Windows\WebCache\WebCacheV01.dat

Step 9

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.

  • {malware file path and name}
  • %AppDataLocal%\Microsoft\Windows\WebCache\res2.log
  • %Application Data%\Macromedia\Flash Player\macromedia.com\support\flashplayer\sys\settings.sol
  • %AppDataLocal%\Microsoft\Windows\WebCache\V01tmp.log
  • %AppDataLocal%\Microsoft\Windows\WebCache\res1.log
  • %Application Data%\Microsoft\SystemCertificates\My\Certificates\DB456BD957FC05675172FD6EE3D6566A49AAA614

Step 10

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • internat.exe


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