Analysis by: Pearl Charlaine Espejo
ALIASES:

Adware.Spigot.72 (DrWeb); Win32/Toolbar.Widgi.G (ESET-NOD32); W32/Spigot_Toolbar.G (Fortinet); Spigot Toolbar (Sophos)

 PLATFORM:

Windows

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

  • Threat Type: Adware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This adware 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: 468,272 bytes
File Type: EXE
Initial Samples Received Date: 03 Nov 2015

Arrival Details

This adware 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 adware drops the following files:

  • %User Temp%\ns{random characters}.tmp
  • %User Temp%\ns{random characters}.tmp\SM.dll
  • %User Temp%\ns{random characters}.tmp\System.dll
  • %User Temp%\ns{random characters}.tmp\NSISdl.dll
  • %User Temp%\ns{random characters}.tmp\pixel
  • %User Temp%\~sp1D.tmp.exe
  • %Windows%\Tasks\_LateExecution_.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.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Other Details

This adware connects to the following possibly malicious URL:

  • http://www.{BLOCKED}serbar.com/images/pixel.gif?ct=smstask&ver={version}&cnid=&cmd={malware path and filename}&cid={ID 1}&cid2={ID 2}&event=finish&err={number}
  • http://{BLOCKED}2.{BLOCKED}serbar.com/kits/sds/update.xml
  • http://www.{BLOCKED}serbar.com/kits/sds/update.xml
  • http://{BLOCKED}2.{BLOCKED}serbar.com/kits/sds/SMSetup.exe

  SOLUTION

Minimum Scan Engine: 9.800
SSAPI PATTERN File: 1.679.00
SSAPI PATTERN Date: 14 Nov 2015

NOTES:

Trend customers:

    Keep your pattern and scan engine files updated. Trend Micro antivirus software can clean or remove most types of computer threats. Malware, though, such as Trojans, scripts, overwriting viruses and joke programs which are identified as uncleanable, should simply be deleted.

All Internet users:

  • Use HouseCall - the Trend Micro online threat scanner to check for malware that may already be on your PC.
  • Catch malware/grayware before they affect your PC or network. Secure your Web world with Trend Micro products that offer the best anti-threat and content security solutions for home users, corporate users, and ISPs. Go here for more information on Trend Micro products that fit your needs.


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