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TROJ_KRASPD.A

August 04, 2018
 Analysis by: Kiyoshi Obuchi
 ALIASES:

Win32/Toolbar.MyWebSearch.BA potentially unwanted (ESET-NOD32); Generic PUA DN (PUA) (Sophos AV)

 PLATFORM:

Windows

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

  • 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:

380568 bytes

File Type:

EXE

Initial Samples Received Date:

22 May 2018

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 drops the following component file(s):

  • %User Temp%\nswFD81.tmp\nsDialogs.dll
  • %User Temp%\nswFD81.tmp\System.dll
  • %User Temp%\nswFD81.tmp\TransitSimplified_msi_bg-copy_1501785279667.bmp
  • %User Temp%\nswFD81.tmp\reporting
  • %User Temp%\nswFD81.tmp\cancel_blue_1473358017200.bmp
  • %User Temp%\nswFD81.tmp\Install_ENG_1435680405923.bmp
  • %User Temp%\nswFD81.tmp\reporting
  • %User Temp%\nswFD81.tmp\installerParams
  • %User Temp%\nswFD81.tmp\reporting
  • %User Temp%\nswFD81.tmp\TransitSimplified_msi_bg-copy_1501785292781.bmp
  • %User Temp%\nswFD81.tmp\reporting
  • %AppDataLocal%\TransitSimplifiedTooltab\TooltabExtension.dll
  • %User Temp%\nswFD81.tmp\reporting

(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.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista, 7, and 8.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_URSER\Software\TransitSimplified
Start Page = "http://hp.{BLOCKED}y.com/transitsimplified/ttab02/index.html?n=78497636&p2=^BYP^mni000^TTAB02&ptb=2DA31C30-F19F-4223-A7D9-0AE5A043F453&coid=6357f541372247b29de80313cf5c2932"

HKEY_CURRENT_URSER\Software\TransitSimplified
UnInstallSurveyUrl = "http://@{downloadDomain}.dl.{BLOCKED}y.com/uninstall.jhtml?surveyUrl=http%3A%2F%2Fwww.research.net%2Fr%2FHYSCVNM%3Fc%3D2DA31C30-F19F-4223-A7D9-0AE5A043F453%26ptb%3D^BYP^mni000^TTAB02"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://anx.{BLOCKED}ark.com/anx.gif?anxa=CAPDownloadProcess&anxe=Error&errorCode=-16&errorType=nsisError&errorDetails=&platform=vicinio&anxv=2.7.1.3000&anxd=2018-05-18&coid=&refPartner=^BYP^mni000^TTAB02&refSub=&anxl=en-US&anxr=-2006788705&refCobrand=BYP&refCampaign=mni000&refTrack=TTAB02&refCountry=
  • http://anx.{BLOCKED}ark.com/anx.gif?anxa=CAPDownloadProcess&anxe=Error&errorCode=-8&errorType=nsisError&errorDetails=3d49db2ecb4855112017327f46b76b184cb4a3d6%2Eexe&platform=vicinio&anxv=2.7.1.3000&anxd=2018-05-18&coid=6357f541372247b29de80313cf5c2932&refPartner=^BYP^mni000^TTAB02&refSub=&anxl=en-US&anxr=2104981669&refCobrand=BYP&refCampaign=mni000&refTrack=TTAB02&refCountry=
  • http://dp.tb.{BLOCKED}k.com:443
  • http://apps.{BLOCKED}ust.com/roots/dstrootcax3.p7c

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.422.03

FIRST VSAPI PATTERN DATE:

04 Aug 2018

VSAPI OPR PATTERN File:

14.423.00

VSAPI OPR PATTERN Date:

05 Aug 2018

Scan your computer with your Trend Micro product to delete files detected as TROJ_KRASPD.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 the following Trend Micro Support pages for more information:


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