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TROJ_KORPODE.A

February 07, 2018
 Analysis by: Rheniel Rhay Ramos
 ALIASES:

HEUR:Trojan.Win32.RockRat.gen (Kaspersky); Trojan:Win32/Korpode.A (Microsoft); Gen:Variant.Johnnie.87661 (BitDefender)

 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:

Dropped by other malware, 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 executes then deletes itself afterward.

It steals certain information from the system and/or the user.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

626,694 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 Feb 2018

Payload:

Connects to URLs/IPs, Steals information

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 files:

  • {8 hex characters}.tmp -> screenshot of the affected system
  • {Random Number}.dat -> (deleted afterwards)

It adds the following processes:

  • wscript.exe
  • cmd.exe /C ping 0.1.1.2 -n 1 -w 4000 > nul & del "{Folder Location of Malware}\{Malware Name}.exe"
  • %System%\PING.EXE ping 0.1.1.2 -n 1 -w 4000

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It executes then deletes itself afterward.

It injects codes into the following process(es):

  • wscript.exe (added process)

Information Theft

This Trojan steals the following information:

  • Machine Type
  • Screenshot of the Affected System
  • Stored usernames and passwords from the following web browsers:
    • Internet Explorer
    • Chrome
    • Firefox

Other Details

This Trojan connects to the following website to send and receive information:

  • https://{BLOCKED}i.{BLOCKED}d.com
  • https://{BLOCKED}i.{BLOCKED}x.com
  • https://{BLOCKED}i.{BLOCKED}xapi.com
  • https://{BLOCKED}i.{BLOCKED}x.net

It does the following:

  • It queries the following registry to determine if it is being run in a vm or sandbox:
    • HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System
      • SystemBiosVersion

It checks if the following virtual machine or sandbox related module(s) is loaded in the affected system:

  • SbieDll.dll
  • Dbghelp.dll
  • Api_log.dll
  • Dir_watch.dll

It checks if the following virtual machine or sandbox related folder(s) or file(s) is present in the affected system:

  • C:\Program Files\VMware\VMware Tools\vmtoolsd.exe

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.942.08

FIRST VSAPI PATTERN DATE:

02 Feb 2018

VSAPI OPR PATTERN File:

13.943.00

VSAPI OPR PATTERN Date:

02 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

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.  
  • {8 hex characters}.tmp
  • {Random Number}.dat

Step 4

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