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BKDR_SHOTODOR.RRCC

January 23, 2017
 Analysis by: Byron Jon Gelera
 ALIASES:

TrojanSpy:MSIL/Golroted.B (Microsoft)

 PLATFORM:

Windows

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

  • 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:

2,040,320 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

20 Jan 2017

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:

  • %User Profile%\agooIXzT8w3faijx\QZXbQ
  • %User Profile%\agooIXzT8w3faijx\WLGU.exe
  • %User Profile%\WLGU1

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It drops and executes the following files:

  • %User Profile%\WLGU.exe
  • %User Profile%\QZXbQ

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Autostart Technique

This backdoor drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\GEBWfaWJBNeT.lnk

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

Other Details

This backdoor connects to the following URL(s) to get the affected system's IP address:

  • http://whatismyipaddress.com/

It connects to the following possibly malicious URL:

  • http://{BLOCKED}tory.certum.pl/ctnca.cer
  • {BLOCKED}p.{BLOCKED}x.com
  • {BLOCKED}p.{BLOCKED}x.com

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

13.168.02

FIRST VSAPI PATTERN DATE:

20 Jan 2017

VSAPI OPR PATTERN File:

13.169.00

VSAPI OPR PATTERN Date:

21 Jan 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

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.
  • %User Profile%\agooIXzT8w3faijx\QZXbQ
  • %User Profile%\agooIXzT8w3faijx\WLGU.exe
  • %User Profile%\WLGU1
  • %User Profile%\WLGU.exe
  • %User Profile%\QZXbQ
  • %User Startup%\GEBWfaWJBNeT.lnk

Step 5

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