Threat Encyclopedia

Trojan.Win32.TILDEB.A

Publish date: December 13, 2018

ANALYSIS BY

John Rey Canon


ALIASES:

Trojan.Win32.Shadowbrokers.bd (Kaspersky); Trojan.Win32.S.ShadowBrokers.57344 (ViRobot)

PLATFORM:

Windows

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

  • Threat Type:Trojan

  • Destructiveness:No

  • Encrypted: No

  • In the wild: Yes

OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This malware is part of the Shadow Brokers' leaked tools and exploits. It targets Windows NT 4.0 OS and Microsoft Exchange Server. Despite targeting older environments, an external report on its traffic capture shows successful communications with the hardcoded IP address. This could imply that the implant was active and in-the-wild.

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

It executes commands from a remote malicious user, effectively compromising the affected system.

TECHNICAL DETAILS

File Size:

57,344 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Dec 2018

Arrival Details

This Trojan 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 adds the following mutexes to ensure that only one of its copies runs at any one time:

  • nowMutex

Backdoor Routine

This Trojan executes the following commands from a remote malicious user:

    Other Details

    This Trojan does the following:

    • It connects to the following C&C:
      • {BLOCKED}.{BLOCKED}.55.211:25
    • It executes the following commands from a remote malicious user:
      • 0x20 - Downloads data from the server, creates mailslot
      • 0x300 - Injects code into the respective process
      • 0x380 - Sets MS Exchange Registry
      • 0x400 - Gets a list of files and folders
      • 0x401 - Uploads a file to the server
      • 0x403 - Deletes a file
      • 0x500 - Check connection
      • 0x1000 - Terminate process
      • Format string messages
        • 0x201
        • 0x202
        • 0x203
        • 0x204
        • 0x206 OR 0x207
        • 0x280
        • 0x281
        • >= 0x285
        • 0x290 OR 0x291 OR 0x292

    SOLUTION

    Minimum Scan Engine:

    9.850

    FIRST VSAPI PATTERN FILE:

    14.670.04

    FIRST VSAPI PATTERN DATE:

    06 Dec 2018

    VSAPI OPR PATTERN File:

    14.671.00

    VSAPI OPR PATTERN Date:

    07 Dec 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

    Identify and terminate files detected as Trojan.Win32.TILDEB.A This step allows you to identify and disable the malware/grayware/spyware process files running in memory in preparation for the next steps.

    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.

    To terminate the malware/grayware/spyware process:

    1. Scan your computer with your Trend Micro product and take note of the name of the malware/grayware/spyware detected.
    2. Open Windows Task Manager. To do this, press CTRL+SHIFT+ESC.
    3. View the list of all running programs. To do this:
      • For Windows 2000, XP, Server 2003, Vista, 7 and Server 2008 users, click the Processes tab.
      • For Windows 8, 8.1 and Server 2012 users, click the Details tab.
    4. In the list of running programs, locate a malware/grayware/spyware file detected earlier.
    5. Select the detected files, then press either the End Task or the End Process button, depending on the version of Windows you are using.
    6. Do the same for the remaining detected malware/grayware/spyware files in the list of running programs.
    7. To check if the malware/grayware/spyware process has been terminated, close Task Manager, and then open it again.
    8. Close Task Manager.

    Step 3

    Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.TILDEB.A. 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 the following Trend Micro Support pages for more information:



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