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Backdoor.Win32.NANOCORE.TIAOODEC

January 09, 2020
 ALIASES:

Trojan-aitinject.ah (McAfee); HEUR:Trojan.Win32.Generic (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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.

  TECHNICAL DETAILS

File Size:

939,438 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

09 Jan 2020

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 adds the following processes:

  • %User Temp%\19701704\lsk.exe mus=gss
  • %User Temp%\19701704\lsk.exe %User Temp%\19701704\OOVUX

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It creates the following folders:

  • %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\Logs
  • %User Temp%\19701704
  • %System Root%\Users
  • %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\Logs\{username}
  • %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333
  • %User Profile%\AppData

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Dropping Routine

This Backdoor drops the following files:

  • %User Temp%\19701704\dcp.xl
  • %User Temp%\19701704\siu.jpg
  • %User Temp%\19701704\wkd.icm
  • %User Temp%\19701704\tbo.jpg
  • %User Temp%\19701704\DateTimeConstants.ico
  • %User Temp%\19701704\iiv.pdf
  • %User Temp%\19701704\opp.pdf
  • %User Temp%\19701704\eua.ppt
  • %User Temp%\19701704\gib.docx
  • %User Temp%\19701704\cve.bmp
  • %User Temp%\19701704\ijp.bmp
  • %User Temp%\19701704\ute.pdf
  • %User Temp%\19701704\aqm.bmp
  • %User Temp%\19701704\bff.pdf
  • %User Temp%\19701704\ljk.ppt
  • %User Temp%\19701704\lrj.bmp
  • %User Temp%\19701704\gsk.jpg
  • %User Temp%\19701704\uol.mp3
  • %User Temp%\19701704\tst.ico
  • %User Temp%\19701704\gai.txt
  • %User Temp%\19701704\xpv.mp4
  • %User Temp%\19701704\mss.pdf
  • %User Temp%\19701704\bsw.bmp
  • %User Temp%\19701704\tuv.mp3
  • %User Temp%\19701704\OOVUX
  • %User Temp%\19701704\mom.dat
  • %User Temp%\19701704\mus=gss
  • %User Temp%\19701704\nop.bmp
  • %User Temp%\19701704\der.mp4
  • %User Temp%\19701704\jnm.xl
  • %User Temp%\19701704\bkj.txt
  • %User Temp%\19701704\pdq.mp4
  • %User Temp%\19701704\wvq.ppt
  • %User Temp%\19701704\lsk.exe
  • %User Temp%\19701704\buc.icm
  • %User Temp%\19701704\sdp.mp4
  • %User Temp%\19701704\otu.mp3
  • %User Temp%\19701704\bdw.docx
  • %User Temp%\19701704\wjs.ico
  • %User Temp%\19701704\aoa.txt
  • %User Temp%\19701704\kfv.bmp
  • %User Temp%\19701704\fhw.mp4
  • %User Temp%\19701704\dno.docx
  • %User Temp%\19701704\ButtonConstants.pdf
  • %User Temp%\19701704\utt.ico
  • %User Temp%\19701704\sbv.jpg
  • %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\run.dat
  • %User Temp%\19701704\dqb.jpg

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Backdoor connects to the following possibly malicious URL:

  • http://elumadns.{BLOCKED}01.com
  • http://oluwa101.{BLOCKED}o.org

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

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 Backdoor.Win32.NANOCORE.TIAOODEC

[ 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

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %User Temp%\19701704\dcp.xl
  • %User Temp%\19701704\siu.jpg
  • %User Temp%\19701704\wkd.icm
  • %User Temp%\19701704\tbo.jpg
  • %User Temp%\19701704\DateTimeConstants.ico
  • %User Temp%\19701704\iiv.pdf
  • %User Temp%\19701704\opp.pdf
  • %User Temp%\19701704\eua.ppt
  • %User Temp%\19701704\gib.docx
  • %User Temp%\19701704\cve.bmp
  • %User Temp%\19701704\ijp.bmp
  • %User Temp%\19701704\ute.pdf
  • %User Temp%\19701704\aqm.bmp
  • %User Temp%\19701704\bff.pdf
  • %User Temp%\19701704\ljk.ppt
  • %User Temp%\19701704\lrj.bmp
  • %User Temp%\19701704\gsk.jpg
  • %User Temp%\19701704\uol.mp3
  • %User Temp%\19701704\tst.ico
  • %User Temp%\19701704\gai.txt
  • %User Temp%\19701704\xpv.mp4
  • %User Temp%\19701704\mss.pdf
  • %User Temp%\19701704\bsw.bmp
  • %User Temp%\19701704\tuv.mp3
  • %User Temp%\19701704\OOVUX
  • %User Temp%\19701704\mom.dat
  • %User Temp%\19701704\mus=gss
  • %User Temp%\19701704\nop.bmp
  • %User Temp%\19701704\der.mp4
  • %User Temp%\19701704\jnm.xl
  • %User Temp%\19701704\bkj.txt
  • %User Temp%\19701704\pdq.mp4
  • %User Temp%\19701704\wvq.ppt
  • %User Temp%\19701704\lsk.exe
  • %User Temp%\19701704\buc.icm
  • %User Temp%\19701704\sdp.mp4
  • %User Temp%\19701704\otu.mp3
  • %User Temp%\19701704\bdw.docx
  • %User Temp%\19701704\wjs.ico
  • %User Temp%\19701704\aoa.txt
  • %User Temp%\19701704\kfv.bmp
  • %User Temp%\19701704\fhw.mp4
  • %User Temp%\19701704\dno.docx
  • %User Temp%\19701704\ButtonConstants.pdf
  • %User Temp%\19701704\utt.ico
  • %User Temp%\19701704\sbv.jpg
  • %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\run.dat
  • %User Temp%\19701704\dqb.jpg

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\Logs
  • %User Temp%\19701704
  • %System Root%\Users
  • %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333\Logs\{username}
  • %Application Data%\0EFADD19-2A94-41FB-8931-F2BBC5D61333
  • %User Profile%\AppData

Step 5

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Win32.NANOCORE.TIAOODEC. 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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