TSPY_KEYLOG.YYNC

October 26, 2015
 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.

  TECHNICAL DETAILS

File Size:

424,736 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

26 Oct 2015

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:

  • %System Root%\132095
  • %System Root%\131995
  • %System Root%\132095\131996
  • %System Root%\132095\131997
  • %System Root%\132095\131998

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

Other System Modifications

This spyware deletes the following files:

  • %User Temp%\Gerenciador de Audio.exe:Zone.Identifier

(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.)

It adds the following registry entries:

HKEY_CURRENT_USER\Software
UremO9eifjRAyPANy0OqUA== = "+KxwwwwlnoGyUcQdoFllKQ=="

HKEY_CURRENT_USER\Software
dCZASLe/Djn+Y20IQfXf0w== = "mu8gURpoHuISnyuGzGOeyA=="

HKEY_CURRENT_USER\Software
M/x0y1YNfAfVNCTcsS87nA== = "t3/BzV0mUD5V5WANns043A=="

HKEY_CURRENT_USER\Software
KTZaK2APrORDMF5ALTQeVA== = "{random characters}"

HKEY_CURRENT_USER\Software
dCZASLe/Djn+Y20IQfXf0w== = "CHFKrvIF4FvnXZxmWB9VDw=="

HKEY_CURRENT_USER\Software
4JBjzNdr5bolR0OUaHBn9xC7UKpAMAWAjfiRWS0xneo= = "{random characters}"

Dropping Routine

This spyware drops the following files:

  • %User Temp%\Gerenciador de Audio.exe
  • %System Root%\7433cdb324b04dd5e3c3db213381216c7c539baa
  • %System Root%\132095\131998\1
  • %System Root%\131995\sysmon.exe

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

Other Details

This spyware connects to the following possibly malicious URL:

  • {BLOCKED}.164.182

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

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 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
    • UremO9eifjRAyPANy0OqUA== = "+KxwwwwlnoGyUcQdoFllKQ=="
  • In HKEY_CURRENT_USER\Software
    • dCZASLe/Djn+Y20IQfXf0w== = "mu8gURpoHuISnyuGzGOeyA=="
  • In HKEY_CURRENT_USER\Software
    • M/x0y1YNfAfVNCTcsS87nA== = "t3/BzV0mUD5V5WANns043A=="
  • In HKEY_CURRENT_USER\Software
    • KTZaK2APrORDMF5ALTQeVA== = "{random characters}"
  • In HKEY_CURRENT_USER\Software
    • dCZASLe/Djn+Y20IQfXf0w== = "CHFKrvIF4FvnXZxmWB9VDw=="
  • In HKEY_CURRENT_USER\Software
    • 4JBjzNdr5bolR0OUaHBn9xC7UKpAMAWAjfiRWS0xneo= = "{random characters}"

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%\Gerenciador de Audio.exe
  • %System Root%\7433cdb324b04dd5e3c3db213381216c7c539baa
  • %System Root%\132095\131998\1
  • %System Root%\131995\sysmon.exe

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.
  • %System Root%\132095
  • %System Root%\131995
  • %System Root%\132095\131996
  • %System Root%\132095\131997
  • %System Root%\132095\131998

Step 5

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

Step 6

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %User Temp%\Gerenciador de Audio.exe:Zone.Identifier


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