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ADWARE.WIN32.INSTALLCORE.BA

November 08, 2018
 Analysis by: Kiyoshi Obuchi
 ALIASES:

Win32/InstallCore.Gen.A potentially unwanted (ESET-NOD32)

 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:

2,369,760 bytes

File Type:

EXE

Initial Samples Received Date:

02 Sep 2018

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%\is-0HI89.tmp\f5b1884598413730f6ef6ee2a65314cbe2ba53ea.tmp
  • %User Temp%\is-L9GLG.tmp\_isetup\_shfoldr.dll
  • %Program Files%\Tenod\Sakicili.exe
  • %Program Files%\Tenod\unins000.dat
  • %Program Files%\Tenod\is-BH7S7.tmp
  • %Program Files%\Tenod\is-H7A93.tmp
  • %Program Files%\Tenod\is-BM61K.tmp
  • %Program Files%\Tenod\is-I37LK.tmp
  • %Program Files%\Tenod\is-0J9NR.tmp
  • %Program Files%\Tenod\is-DJTQ3.tmp
  • %Program Files%\Tenod\is-Q7QPL.tmp
  • %Program Files%\Tenod\is-3RESM.tmp
  • %Program Files%\Tenod\is-4RB66.tmp
  • %Program Files%\Tenod\unins000.exe
  • %Program Files%\Tenod\Loherabipari.pages
  • %Program Files%\Tenod\Sakicili.exe
  • %Program Files%\Tenod\Copam.doc
  • %Program Files%\Tenod\Lekohatopole.wav
  • %Program Files%\Tenod\Cohetamo
  • %Program Files%\Tenod\Monatabora.com
  • %Program Files%\Tenod\Hepug.txt
  • %Program Files%\Tenod\Betukotup.t

It creates the following folders:

  • %User Temp%\is-0HI89.tmp
  • %User Temp%\is-L9GLG.tmp
  • %User Temp%\is-L9GLG.tmp\_isetup
  • %Program Files%\Tenod

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).)

Other System Modifications

This Adware adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
Inno Setup: Setup Version = 5.5.4 (a)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
Inno Setup: App Path = %Program Files%\Tenod

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
InstallLocation = %Program Files%\Tenod\

KEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
Inno Setup: Icon Group = Tenod

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
DisplayName = Tenod version 3.4

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
DisplayIcon = %Program Files%\Tenod\Habegemoc.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
UninstallString = "%Program Files%\Tenod\unins000.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
QuietUninstallString = "%Program Files%\Tenod\unins000.exe" /SILENT

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
DisplayVersion = 3.4

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
NoModify = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
NoRepair = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
InstallDate = {Installation Date}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
MajorVersion = 3

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
MinorVersion = 4

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Tenod_is1
EstimatedSize = 861