TROJ_OLYMPICDESTROYER.A

February 13, 2018
 Analysis by: Rheniel Rhay Ramos
 ALIASES:

Win.Trojan.OlympicDestroyer-6446992-0 (ClamAV); Trojan-PSW.OlympicDestroyer (Ikarus)

 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

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 does not have any backdoor routine.

  TECHNICAL DETAILS

File Size:

1,861,632 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

09 Feb 2018

Payload:

Drops files

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 drops the following copies of itself into the affected system:

  • %User Temp%\_{Random 1}.exe -> modified copy

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

It drops the following files:

  • %User Temp%\_{Random 2}.exe -> PsExec.exe (Normal File)
  • C:\Users\Public\{Hex Characters}

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

It drops and executes the following files:

  • %User Temp%\_{Random 3}.exe -> detected as TROJ_DESBACK.A
  • %User Temp%\{Random 1}.exe -> detected as TSPY_BROWPASS.D (Browser Credential Stealer)
  • %User Temp%\{Random 2}.exe -> detected as TSPY_MALSASS.A (System Credential Stealer)

It adds the following processes:

  • %User Temp%\{Random 1}.exe 123 \.\pipe\{Pipe Name}
  • %User Temp%\{Random 2}.exe 123 \.\pipe\{Pipe Name}

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

Backdoor Routine

This Trojan does not have any backdoor routine.

Other Details

This Trojan does the following:

  • It searches for available networks then uses PsExec to propagate remotely through the said networks.
  • It uses the following credentials for the remote connection:
    • Hardcoded Credentials
    • Credentials gathered using the executed credential stealers

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.964.02

FIRST VSAPI PATTERN DATE:

09 Feb 2018

VSAPI OPR PATTERN File:

13.965.00

VSAPI OPR PATTERN Date:

10 Feb 2018

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

Identify and terminate files detected as TROJ_OLYMPICDESTROYER.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 4

Terminate this process using Process Explorer

[ Learn More ]
If you still cannot terminate the malware/grayware process because it is not displayed in Process Explorer, please restart your computer in Safe Mode. You may refer to this page for details.

Step 5

Search and delete these files

[ 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.
  • %User Temp%\_{Random 1}.exe
  • %User Temp%\_{Random 2}.exe
  • %User Temp%\_{Random 3}.exe
  • %User Temp%\{Random 1}.exe
  • %User Temp%\{Random 2}.exe
  • C:\Users\Public\{Hex Characters}

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_OLYMPICDESTROYER.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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