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Backdoor.Win32.NETERO.A

July 12, 2019
 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:

Dropped by other malware, Downloaded from the Internet

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 gathers certain information on the affected computer.

  TECHNICAL DETAILS

File Size:

1,077,248 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

08 Jul 2019

Payload:

Steals information, Connects to URLs/IPs

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.

Installation

This Backdoor drops the following files:

  • {Malware Directoty}\Error.txt
  • {Malware Directoty}\Help.txt

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

  • 22112edc-c204-4d3a-b85b-e84c7d4249c3

Other System Modifications

This Backdoor adds the following registry keys:

HKEY_CURRENT_USER\EUDC\313
hisoka_v2 = ""

It adds the following registry entries:

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
IS_STD = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
SPID = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
EP = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
CM = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
ID = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
Engine = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
EWSC = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
EXPIR = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
DNSRS = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
Golden_Random = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
CD = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
Step = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
Response = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
DNSTYP = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
LUK = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
ERR = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
BKENG = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
NETE_PTH = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
SLP = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
RS = {Encrypted String}

HKEY_CURRENT_USER\EUDC\313\
hisoka_v2
HSK = {Encrypted String}

Information Theft

This Backdoor gathers the following information on the affected computer:

  • Domain IP
  • OS Name
  • User Name
  • Machine Name

Other Details

This Backdoor does the following:

  • This Backdoor is capable of:
    • Sending Email
    • Manipulating Registy through Import
    • Updating Itself
    • Using nslookup
    • Encrypting/Decrypting Responses
  • It connects to the following URL:
    • {BLOCKED}.{BLOCKED}.10.10
    • {BLOCKED}service.com:53
  • It uses the following parameters:
    • -E [DNS] [HTTPS] [EWS domain\\user:pass:url:ver] --> Run in Background
    • -S [8.8.8.8] [4.2.2.4] --> DNS Resolver Server
    • -I SIXLTR --> Set ID
    • -B --> Run in Background
    • -SYS --> Run With STSTEM Sche*dulers [need Privilge]
    • -U --> Run With user Sche*dulers
    • -L [num] --> Run and set lives days
    • -G [num] --> Golden Random Num [ID]
    • -C --> clear Profiled and run
    • -T --> Change Tactick and run
    • 66 --> Display Parameters

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.222.07

FIRST VSAPI PATTERN DATE:

08 Jul 2019

VSAPI OPR PATTERN File:

15.223.00

VSAPI OPR PATTERN Date:

09 Jul 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

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.
  • {Malware Directoty}\Error.txt
  • {Malware Directoty}\Help.txt

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\EUDC\313\hisoka_v2
    • IS_STD = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • SPID = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • EP = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • CM = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • ID = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • Engine = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • EWSC = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • EXPIR = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • DNSRS = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • Golden_Random = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • CD = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • Step = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • Response = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • DNSTYP = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • LUK = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • ERR = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • BKENG = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • NETE_PTH = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • SLP = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • RS = {Encrypted String}
  • In HKEY_CURRENT_USER\EUDC\313\hisoka_v2
    • HSK = {Encrypted String}

Step 6

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\EUDC
    • 313hisoka_v2 = ""

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Backdoor.Win32.NETERO.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 this Knowledge Base page for more information.


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