Analysis by: Jay Garcia

ALIASES:

VirTool:Win64/Atosev.A (Microsoft)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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

It does not have any file infection routine.

It does not have any propagation routine.

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

It does not have any information-stealing capability.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size: 290,304 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 01 Aug 2019
Payload: Connects to URLs/IPs, Downloads files

Arrival Details

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

Infection Points

This Backdoor does not have any file infection routine.

Installation

This Backdoor adds the following processes:

  • %System%\notepad.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It injects codes into the following process(es):

  • added %System%\notepad.exe process

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Propagation

This Backdoor does not have any propagation routine.

Backdoor Routine

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

  • Execute PowerShell commands
  • Upload/Download files
  • Manage files
  • Manage services
  • Read/Modify file time
  • Obtain/Create access tokens
  • Impersonate tokens
  • Open processes
  • Inject codes to processes
  • Adjust permissions in process
  • Connect to a named pipe
  • Use/Purge Kerberos tickets
  • Escalate privileges

Rootkit Capabilities

This Backdoor does not have rootkit capabilities.

Information Theft

This Backdoor does not have any information-stealing capability.

Other Details

This Backdoor connects to the following website to send and receive information:

  • http://12491.{BLOCKED}.somberbagel-hx.org/weye?param={value}
  • http://12491.{BLOCKED}.wistfuleye.net,/weye?param={value}
  • http://12491.{BLOCKED}.cobaltfinder.org/weye?param={value}

It does the following:

  • This malware starts the following service:
    • DceRpcSs

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.272.06
FIRST VSAPI PATTERN DATE: 02 Aug 2019
VSAPI OPR PATTERN File: 15.273.00
VSAPI OPR PATTERN Date: 03 Aug 2019

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

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

Disable this malware service

[ Learn More ]
  •  
    • DceRpcSs

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Backdoor.Win64.COBEACON.QND. 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 6

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win64.COBEACON.QND. 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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