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Trojan.Win32.TILDEB.A

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 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
    • It connects to the following C&C:
      • {BLOCKED}.{BLOCKED}.55.211:25

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

    Step 2

    Identify and terminate files detected as Trojan.Win32.TILDEB.A

    [ 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 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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