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TROJ_SKEEYAH.USXQ

November 01, 2016
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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 deletes itself after execution.

  TECHNICAL DETAILS

File Size:

278,016 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

01 Nov 2016

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 creates the following folders:

  • %User Profile%\Application Data\Winlogon

(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 Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\a17cf2f15e13

It adds the following registry entries:

HKEY_CURRENT_USER\Software\a17cf2f15e13
55f7e988cc9fe07951678008da0e17a79c22bc = "{random values}"

HKEY_CURRENT_USER\Software\a17cf2f15e13
7a5709a07e8b64947c667b70cb4c24145a990158547f02b827ac = "{random values}"

HKEY_CURRENT_USER\Software\a17cf2f15e13
e4c411776c531102a2b0bdbf = "{random values}"

HKEY_CURRENT_USER\Software\a17cf2f15e13
677d0aac6956d62d602a = "{random values}"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\1.tmp
  • %User Profile%\Winlogon\winlogon.lnk
  • %User Profile%\Winlogon\ae73fdfe511c
  • %Windows%\Tasks\Windows Update f118abd8.job
  • %Windows%\Tasks\Windows Update 9059a83e.job
  • %Windows%\Tasks\Windows Update 11bcc632.job
  • %Windows%\Tasks\Windows Update 80251487.job
  • %Windows%\Tasks\Windows Update bb9d9160.job
  • %Windows%\Tasks\Windows Update adcf4737.job

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • 106.186.17.181
  • 91.215.153.31

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
    • a17cf2f15e13

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\a17cf2f15e13
    • 55f7e988cc9fe07951678008da0e17a79c22bc = "{random values}"
  • In HKEY_CURRENT_USER\Software\a17cf2f15e13
    • 7a5709a07e8b64947c667b70cb4c24145a990158547f02b827ac = "{random values}"
  • In HKEY_CURRENT_USER\Software\a17cf2f15e13
    • e4c411776c531102a2b0bdbf = "{random values}"
  • In HKEY_CURRENT_USER\Software\a17cf2f15e13
    • 677d0aac6956d62d602a = "{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%\1.tmp
  • %User Profile%\Winlogon\winlogon.lnk
  • %User Profile%\Winlogon\ae73fdfe511c
  • %Windows%\Tasks\Windows Update f118abd8.job
  • %Windows%\Tasks\Windows Update 9059a83e.job
  • %Windows%\Tasks\Windows Update 11bcc632.job
  • %Windows%\Tasks\Windows Update 80251487.job
  • %Windows%\Tasks\Windows Update bb9d9160.job
  • %Windows%\Tasks\Windows Update adcf4737.job

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\Winlogon

Step 6

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