Threat Encyclopedia

BKDR_ANDROM.ETIN

Publish date: August 30, 2017

ANALYSIS BY

Byron Jon Gelera


ALIASES:

Worm:Win32/Gamarue!rfn (Microsoft)

THREAT SUBTYPE:

Fileless

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

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.546.04

FIRST VSAPI PATTERN DATE:

21 Jul 2017

VSAPI OPR PATTERN File:

13.547.00

VSAPI OPR PATTERN Date:

22 Jul 2017

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 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
    • {UID} = "%System%\WindowsPowerShell\v1.0\powershell.exe -WindowStyle hidden -NoLogo -NonInteractive -ep bypass -nop iex ([Text.Encoding]::ASCII.GetString([Convert]::FromBase64String((gp 'HKCU:\Software\Classes\{random character}').{random character})));"
  • In HKEY_CURRENT_USER\Software\Classes\{random characters}
    • {random characters} = {base 64 encoded powershell command}
  • In HKEY_CURRENT_USER\Software\Classes\{random characters}
    • {UID} = {encrypted binary data}
  • In HKEY_CURRENT_USER\Console\%SystemRoot%\_system32_WIndowsPowerShell_v1.0_powershell.exe
    • WindowPosition = 4294905760
  • In HKEY_CURRENT_USER\Console\%SystemRoot%\_system32_WIndowsPowerShell_v1.0_powershell.exe
    • ScreenBufferSize = 65616
  • In HKEY_CURRENT_USER\Console\%SystemRoot%\_system32_WIndowsPowerShell_v1.0_powershell.exe
    • WindowSize = 65616

Step 5

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