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TROJ_FR.E120B75A

January 23, 2014
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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.

  TECHNICAL DETAILS

File Size:

661,344 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

23 Jan 2014

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 Temp%\ish214890
  • %User Temp%\ISH214~1\css
  • %User Temp%\ISH214~1\css\sdk-ui
  • %User Temp%\ISH214~1\css\sdk-ui\images
  • %User Temp%\ISH214~1\images
  • %User Temp%\ISH214~1\locale
  • %User Temp%\is555503518

(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 and 7.)

Other System Modifications

This Trojan modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
Name = "{malware file name}"

(Note: The default value data of the said registry entry is iexplore.exe.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DirectDraw\MostRecentApplication
ID = "2a425e19"

(Note: The default value data of the said registry entry is 41107b81.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\0003475B.log
  • %User Temp%\ISH214~1\css\ie6_main.css
  • %User Temp%\ISH214~1\css\main.css
  • %User Temp%\ISH214~1\css\sdk-ui\browse.css
  • %User Temp%\ISH214~1\css\sdk-ui\button.css
  • %User Temp%\ISH214~1\css\sdk-ui\checkbox.css
  • %User Temp%\ISH214~1\css\sdk-ui\images\button-bg.png
  • %User Temp%\ISH214~1\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\ISH214~1\css\sdk-ui\images\progress-bg.png
  • %User Temp%\ISH214~1\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\ISH214~1\css\sdk-ui\progress-bar.css
  • %User Temp%\ISH214~1\csshover3.htc
  • %User Temp%\ISH214~1\form.bmp.Mask
  • %User Temp%\ISH214~1\images\BG.png
  • %User Temp%\ISH214~1\images\Close.png
  • %User Temp%\ISH214~1\images\Close_Hover.png
  • %User Temp%\ISH214~1\images\Color_Button.png
  • %User Temp%\ISH214~1\images\Color_Button_Hover.png
  • %User Temp%\ISH214~1\images\Grey_Button.png
  • %User Temp%\ISH214~1\images\Grey_Button_Hover.png
  • %User Temp%\ISH214~1\images\Icon_Generic.png
  • %User Temp%\ISH214~1\images\Loader.gif
  • %User Temp%\ISH214~1\images\Pause_Button.png
  • %User Temp%\ISH214~1\images\Progress.png
  • %User Temp%\ISH214~1\images\ProgressBar.png
  • %User Temp%\ISH214~1\images\Quick_Specs.png
  • %User Temp%\ISH214~1\images\Resume_Button.png
  • %User Temp%\ISH214~1\locale\CS.locale
  • %User Temp%\ISH214~1\locale\EL.locale
  • %User Temp%\ISH214~1\locale\EN.locale
  • %User Temp%\ISH214~1\locale\ID.locale
  • %User Temp%\ISH214~1\locale\JA.locale
  • %User Temp%\ISH214~1\locale\NL.locale
  • %User Temp%\ish214890\bootstrap_42855.html
  • %User Temp%\00035C4A.log
  • %User Temp%\icreinstall_{malware file name}
  • %Desktop%\Continue AMCap Installation.lnk
  • %User Temp%\00036032.log
  • %User Temp%\is555503518\221380_Setup.ZIP
  • %User Temp%\is555503518\221380_Setup.ZIP.part

(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 and 7.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}d.com/dl.asp?filename=amcap.zip
  • http://os.{BLOCKED}adastrocdn.com/DownloadAstro/?v=3.0&c=1111506481
  • http://{BLOCKED}d.com/download/amcap.zip

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
    • From: Name = "{malware file name}"
      To: Name = ""iexplore.exe""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw\MostRecentApplication
    • From: ID = "2a425e19"
      To: ID = ""41107b81""

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%\0003475B.log
  • %User Temp%\ISH214~1\css\ie6_main.css
  • %User Temp%\ISH214~1\css\main.css
  • %User Temp%\ISH214~1\css\sdk-ui\browse.css
  • %User Temp%\ISH214~1\css\sdk-ui\button.css
  • %User Temp%\ISH214~1\css\sdk-ui\checkbox.css
  • %User Temp%\ISH214~1\css\sdk-ui\images\button-bg.png
  • %User Temp%\ISH214~1\css\sdk-ui\images\progress-bg-corner.png
  • %User Temp%\ISH214~1\css\sdk-ui\images\progress-bg.png
  • %User Temp%\ISH214~1\css\sdk-ui\images\progress-bg2.png
  • %User Temp%\ISH214~1\css\sdk-ui\progress-bar.css
  • %User Temp%\ISH214~1\csshover3.htc
  • %User Temp%\ISH214~1\form.bmp.Mask
  • %User Temp%\ISH214~1\images\BG.png
  • %User Temp%\ISH214~1\images\Close.png
  • %User Temp%\ISH214~1\images\Close_Hover.png
  • %User Temp%\ISH214~1\images\Color_Button.png
  • %User Temp%\ISH214~1\images\Color_Button_Hover.png
  • %User Temp%\ISH214~1\images\Grey_Button.png
  • %User Temp%\ISH214~1\images\Grey_Button_Hover.png
  • %User Temp%\ISH214~1\images\Icon_Generic.png
  • %User Temp%\ISH214~1\images\Loader.gif
  • %User Temp%\ISH214~1\images\Pause_Button.png
  • %User Temp%\ISH214~1\images\Progress.png
  • %User Temp%\ISH214~1\images\ProgressBar.png
  • %User Temp%\ISH214~1\images\Quick_Specs.png
  • %User Temp%\ISH214~1\images\Resume_Button.png
  • %User Temp%\ISH214~1\locale\CS.locale
  • %User Temp%\ISH214~1\locale\EL.locale
  • %User Temp%\ISH214~1\locale\EN.locale
  • %User Temp%\ISH214~1\locale\ID.locale
  • %User Temp%\ISH214~1\locale\JA.locale
  • %User Temp%\ISH214~1\locale\NL.locale
  • %User Temp%\ish214890\bootstrap_42855.html
  • %User Temp%\00035C4A.log
  • %User Temp%\icreinstall_{malware file name}
  • %Desktop%\Continue AMCap Installation.lnk
  • %User Temp%\00036032.log
  • %User Temp%\is555503518\221380_Setup.ZIP
  • %User Temp%\is555503518\221380_Setup.ZIP.part

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.
  • %User Temp%\ish214890
  • %User Temp%\ISH214~1\css
  • %User Temp%\ISH214~1\css\sdk-ui
  • %User Temp%\ISH214~1\css\sdk-ui\images
  • %User Temp%\ISH214~1\images
  • %User Temp%\ISH214~1\locale
  • %User Temp%\is555503518

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_FR.E120B75A. 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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