arrow_back
search
close

PUA.Win32.OpenCandy.PCD

October 24, 2022
 Analysis by: Khristian Joseph Morales
 ALIASES:

AdWare.Win32.OpenCandy.frv (KASPERSKY)

 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

This Potentially Unwanted Application arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It does not have any backdoor routine.

  TECHNICAL DETAILS

File Size:

7,458,096 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

11 Oct 2022

Payload:

Connects to URLs/IPs, Drops files

Arrival Details

This Potentially Unwanted Application 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 Potentially Unwanted Application adds the following folders:

  • %User Temp%\ns{random}.tmp
  • %Program Files%\Nitro PDF
  • %Common Programs%\PrimoPDF

(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Common Programs% is the folder that contains common program groups for all users, which is usually C:\Documents and Settings\All Users\Start Menu\Programs on Windows 2000, XP, and Server 2003, or C:\ProgramData\Microsoft\Windows\Start Menu\Programs on Windows Vista, 7, and 8.)

It drops the following files:

  • %User Temp%\ns{random}.tmp
  • %User Temp%\ns{random}.tmp\LangDLL.dll
  • %User Temp%\ns{random}.tmp\OCSetupHlp.dll
  • %User Temp%\ns{random}.tmp\System.dll
  • %User Temp%\ns{random}.tmp\modern-header.bmp
  • %User Temp%\ns{random}.tmp\modern-wizard.bmp
  • %User Temp%\ns{random}.tmp\nsDialogs.dll
  • %Windows%\primopdf.ini
  • %Program Files%\Nitro PDF\PrimoPDF\gsdll32.dll
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoRun.exe
  • %Program Files%\Nitro PDF\PrimoPDF\PrimInstInfo.txt
  • %Program Files%\Nitro PDF\PrimoPDF\Online_UG.url
  • %Program Files%\Nitro PDF\PrimoPDF\PrimInst.exe
  • %Program Files%\Nitro PDF\PrimoPDF\PrimDel.exe
  • %Program Files%\Nitro PDF\PrimoPDF\Configuration\_Default.ini
  • %Program Files%\Nitro PDF\PrimoPDF\Configuration\_Ebook.ini
  • %Program Files%\Nitro PDF\PrimoPDF\Configuration\_Prepress.ini
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\APLWCSB1.SPD
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\FONTS.MFM
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\ICONLIB.DLL
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PrimoPDF.BPD
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PrimoPDF.PPD
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\ps5ui.dll
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.DLL
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.DRV
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.GID
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.HLP
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.INI
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.NTF
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\pscript5.dll
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT5.HLP
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRPTUI.DLL
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoMon\Primomon95.dll
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoMon\Primomon.hlp
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoMon\primomonnt.dll
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.exe
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoSet.dll
  • %Program Files%\Nitro PDF\PrimoPDF\APDB.dll
  • %Program Files%\Nitro PDF\PrimoPDF\Primo_Update.exe
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.nl.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.de.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.fr.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.it.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.es.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\nl\PrimoPDF.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\nl\Primo_Update.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\de\PrimoPDF.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\de\Primo_Update.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\fr\PrimoPDF.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\fr\Primo_Update.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\it\PrimoPDF.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\it\Primo_Update.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\es\PrimoPDF.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\es\Primo_Update.resources.dll
  • %System%\spool\drivers\w32x86\pscript5.dll
  • %System%\spool\drivers\w32x86\ps5ui.dll
  • %System%\spool\drivers\w32x86\pscript5.hlp
  • %System%\spool\drivers\w32x86\primopdf.ppd
  • %System%\spool\drivers\w32x86\pscript.ntf
  • %System%\Primomonnt.dll
  • %Program Files%\Nitro PDF\PrimoPDF\uninstaller.exe
  • %Common Programs%\PrimoPDF\PrimoPDF Settings.lnk
  • %Common Programs%\PrimoPDF\Online User Guide.lnk
  • %Common Programs%\PrimoPDF\Uninstall.lnk
  • %Desktop%\PrimoPDF - Drop Files Here to Convert!.lnk

(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Common Programs% is the folder that contains common program groups for all users, which is usually C:\Documents and Settings\All Users\Start Menu\Programs on Windows 2000, XP, and Server 2003, or C:\ProgramData\Microsoft\Windows\Start Menu\Programs on Windows Vista, 7, and 8.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • %Program Files%\Nitro PDF\PrimoPDF\PrimDel.exe
  • %Program Files%\Nitro PDF\PrimoPDF\PrimInst.exe
  • %Program Files%\Internet Explorer\iexplore.exe -nohome

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Potentially Unwanted Application adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
PrimoPDF

Propagation

This Potentially Unwanted Application does not have any propagation routine.

Backdoor Routine

This Potentially Unwanted Application does not have any backdoor routine.

Rootkit Capabilities

This Potentially Unwanted Application does not have rootkit capabilities.

Other Details

This Potentially Unwanted Application does the following:

  • It opens the following website through browser:
    • http://www.{BLOCKED}df.com/services/LinkRedirector.aspx?lr_prod=Primo&lr_name=welcome&lr_loc=en-US&lr_src=primo&name=&email=&company=&language={Language ID}
        • Redirects to:
      • https://www.{BLOCKED}o.com/

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.800

SSAPI PATTERN File:

2.557.00

SSAPI PATTERN Date:

13 Oct 2022

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\PrimoPDF

Step 4

Search and delete this file

[ Learn More ]
There may be some files 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%\ns{random}.tmp
  • %User Temp%\ns{random}.tmp\LangDLL.dll
  • %User Temp%\ns{random}.tmp\OCSetupHlp.dll
  • %User Temp%\ns{random}.tmp\System.dll
  • %User Temp%\ns{random}.tmp\modern-header.bmp
  • %User Temp%\ns{random}.tmp\modern-wizard.bmp
  • %User Temp%\ns{random}.tmp\nsDialogs.dll
  • %Windows%\primopdf.ini
  • %Program Files%\Nitro PDF\PrimoPDF\gsdll32.dll
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoRun.exe
  • %Program Files%\Nitro PDF\PrimoPDF\PrimInstInfo.txt
  • %Program Files%\Nitro PDF\PrimoPDF\Online_UG.url
  • %Program Files%\Nitro PDF\PrimoPDF\PrimInst.exe
  • %Program Files%\Nitro PDF\PrimoPDF\PrimDel.exe
  • %Program Files%\Nitro PDF\PrimoPDF\Configuration\_Default.ini
  • %Program Files%\Nitro PDF\PrimoPDF\Configuration\_Ebook.ini
  • %Program Files%\Nitro PDF\PrimoPDF\Configuration\_Prepress.ini
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\APLWCSB1.SPD
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\FONTS.MFM
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\ICONLIB.DLL
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PrimoPDF.BPD
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PrimoPDF.PPD
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\ps5ui.dll
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.DLL
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.DRV
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.GID
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.HLP
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.INI
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT.NTF
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\pscript5.dll
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRIPT5.HLP
  • %Program Files%\Nitro PDF\PrimoPDF\Drivers\PSCRPTUI.DLL
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoMon\Primomon95.dll
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoMon\Primomon.hlp
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoMon\primomonnt.dll
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.exe
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoSet.dll
  • %Program Files%\Nitro PDF\PrimoPDF\APDB.dll
  • %Program Files%\Nitro PDF\PrimoPDF\Primo_Update.exe
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.nl.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.de.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.fr.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.it.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\PrimoPDF.es.apdb
  • %Program Files%\Nitro PDF\PrimoPDF\nl\PrimoPDF.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\nl\Primo_Update.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\de\PrimoPDF.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\de\Primo_Update.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\fr\PrimoPDF.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\fr\Primo_Update.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\it\PrimoPDF.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\it\Primo_Update.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\es\PrimoPDF.resources.dll
  • %Program Files%\Nitro PDF\PrimoPDF\es\Primo_Update.resources.dll
  • %System%\spool\drivers\w32x86\pscript5.dll
  • %System%\spool\drivers\w32x86\ps5ui.dll
  • %System%\spool\drivers\w32x86\pscript5.hlp
  • %System%\spool\drivers\w32x86\primopdf.ppd
  • %System%\spool\drivers\w32x86\pscript.ntf
  • %System%\Primomonnt.dll\PrimoPDF\uninstaller.exe
  • %Common Programs%\PrimoPDF\PrimoPDF Settings.lnk
  • %Common Programs%\PrimoPDF\Online User Guide.lnk
  • %Common Programs%\PrimoPDF\Uninstall.lnk
  • %Desktop%\PrimoPDF - Drop Files Here to Convert!.lnk

Step 5

Search and delete this folder

[ 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%\ns{random}.tmp
  • %Program Files%\Nitro PDF
  • %Common Programs%\PrimoPDF

Step 6

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.OpenCandy.PCD. 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:


Did this description help? Tell us how we did.