Analysis by: Jennifer Gumban
ALIASES:

Trojan:Win32/Skeeyah.A!rfn (Microsoft); a variant of MSIL/TrojanDownloader.Small.AJC trojan (NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

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 sends the information it gathers to remote sites.

  TECHNICAL DETAILS

File Size: 11,264 bytes
Memory Resident: No
Initial Samples Received Date: 06 May 2016
Payload: Connects to URLs/IPs

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.

It may be downloaded from the following remote site(s):

  • http://{BLOCKED}a.com.co/js/rfc.pdf.exe
  • http://{BLOCKED}a.com.co/js/curp.pdf.exe
  • http://www.{BLOCKED}ntalimplants.co.in/js/curp.pdf.exe
  • http://{BLOCKED}ntalimplants.co.in/js/curp.pdf.exe
  • http://www.{BLOCKED}ntalimplants.co.in/js/rfc.pdf.exe
  • http://www.{BLOCKED}c.net/descarga.php
  • http://www.{BLOCKED}ntalimplants.co.in/js/rfc.pdf.exe
  • http://{BLOCKED}c.net/descarga.php
  • http://www.{BLOCKED}c.net/descarga.php
  • http://{BLOCKED}m.co/js/slick/curp.pdf.exe
  • http://www.{BLOCKED}m.co/js/slick/curp.pdf.exe

Download Routine

This spyware connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}a.com.co/js/syswow.exe
  • http://{BLOCKED}a.com.co/js//FiddlerCore3dot5.dll
  • http://{BLOCKED}a.com.co/js//Newtonsoft.Json.dll
  • http://{BLOCKED}ntalimplants.co.in/js/syswow.exe
  • http://www.{BLOCKED}m.co/js/slick/syswow.exe
  • http://www.{BLOCKED}m.co/js/slick//FiddlerCore3dot5.dll
  • http://www.{BLOCKED}m.co/js/slick//Newtonsoft.Json.dll

It saves the files it downloads using the following names:

  • %System%\syswow.exe - main payload
  • %System%\FiddlerCore3dot5.dll - Fiddler Proxy Engine non-malicious component
  • %System%\Newtonsoft.Json.dll - JSON framework non malicious component

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

Information Theft

Upon execution of the affected application, it gathers the following information:

  • Machine GUID
  • Active Computer Name

It sends the information it gathers to remote sites.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 12.512.02
FIRST VSAPI PATTERN DATE: 07 May 2016
VSAPI OPR PATTERN File: 12.513.00
VSAPI OPR PATTERN Date: 08 May 2016

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

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