TSPY_BEBLOH.YMNOX

 Analysis by: Byron Jon Gelera

 ALIASES:

Win32/Spy.Bebloh.L (NOD32); Troj/Shiotob-CP (SOPHOS_LITE)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet


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:

242,176 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 Mar 2018

Payload:

Connects to URLs/IPs

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 drops the following copies of itself into the affected system:

  • %Program Files%\Windows NT\{random string}.exe
    (Note: Creation of this copy is triggered when the affected system is shutting down)

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

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
{random string} = "%Program Files%\Windows NT\{random string}.lnk"
(Note: Creation of this registry entry is triggered when the affected system is shutting down)

It drops the following files:

  • %Program Files%\Windows NT\{random string}.lnk <- points to the copy
    (Note: Creation of this file is triggered when the affected system is shutting down, appends parameter "-autorun" to executed copy)

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.)

Other System Modifications

This Trojan Spy adds the following registry keys:

HKEY_CURRENT_USER\Software\{random key}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\{random key}
(Default) = {hex values}

Other Details

This Trojan Spy connects to the following URL(s) to check for an Internet connection:

  • www.google.com

It connects to the following possibly malicious URL:

  • http://{BLOCKED}ran.{BLOCKED}/auth/
  • http://{BLOCKED}.{BLOCKED}-skrdlovice.cz/cli/image1.exe
  • http://{BLOCKED}-skrdlovice.{BLOCKED}/cli/jetcom.exe

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.126.05

FIRST VSAPI PATTERN DATE:

13 Mar 2018

VSAPI OPR PATTERN File:

14.127.00

VSAPI OPR PATTERN Date:

14 Mar 2018

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

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
    • {random key}

Step 5

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
    • {random string} = "%Program Files%\Windows NT\{random string}.lnk"

Step 6

Search and delete this file

[ Learn More ]
There may be some files 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.
  • %Program Files%\\Windows NT\\{random string}.lnk

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_BEBLOH.YMNOX. 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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