TSPY_FAREIT.KCK

April 06, 2017
 ALIASES:

PWS:Win32/Fareit!bit (Microsoft); Trojan.Gen.2 (Symantec); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Autoit2_c.AJCT (AVG)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

1,086,976 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

06 Apr 2017

Arrival Details

This Spyware 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 Spyware creates the following folders:

  • %User Profile%\Application Data\7C4R9Y4Kk5

(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.)

Other System Modifications

This Spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\WinRAR

It adds the following registry entries:

HKEY_CURRENT_USER\Software\WinRAR
HWID = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
Client Hash = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
70100F98A857FCBADABA1095D8C6F833 = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
A00B720E38F98C3D2F1DEC26FAEB3379 = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
50D25F4D1DF9B29CDB291B65062EFBCE = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
91391AC40F6A6C12CC29BF789A35EB20 = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
5E9FD6C31D7575F8E0FEFE704B5F307C = "{random values}"

Dropping Routine

This Spyware drops the following files:

  • %User Temp%\aut4.tmp
  • %User Temp%\58765.exe
  • %User Temp%\71671.exe
  • %User Temp%\86156.exe
  • %User Temp%\99781.exe
  • %User Temp%\114312.exe
  • %User Temp%\nNFo3Ebi.c

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

Other Details

This Spyware connects to the following possibly malicious URL:

  • {BLOCKED}96.94
  • {BLOCKED}96.114
  • {BLOCKED}96.108
  • {BLOCKED}96.115

It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.8

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

Delete this registry key

[ 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
    • WinRAR

Step 3

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\WinRAR
    • HWID = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • Client Hash = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • 70100F98A857FCBADABA1095D8C6F833 = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • A00B720E38F98C3D2F1DEC26FAEB3379 = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • 50D25F4D1DF9B29CDB291B65062EFBCE = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • 91391AC40F6A6C12CC29BF789A35EB20 = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • 5E9FD6C31D7575F8E0FEFE704B5F307C = "{random values}"

Step 4

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%\aut4.tmp
  • %User Temp%\58765.exe
  • %User Temp%\71671.exe
  • %User Temp%\86156.exe
  • %User Temp%\99781.exe
  • %User Temp%\114312.exe
  • %User Temp%\nNFo3Ebi.c

Step 5

Search and delete this folder

[ 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.
  • %User Profile%\Application Data\7C4R9Y4Kk5

Step 6

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