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PUA.Win32.Keygen.CRRO

November 22, 2023
 Analysis by: John Rainier Navato
 ALIASES:

HackTool:Win32/Keygen (MICROSOFT)

 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:

Downloaded from the Internet, Dropped by other malware

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:

1,905,664 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

10 Nov 2023

Payload:

Connects to URLs/IPs

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 drops the following component file(s):

  • %User Temp%\dup2patcher.dll
  • %User Temp%\bassmod.dll

(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).)

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 displays the following GUI:

  • It modifies the following files when Patch button is clicked:
    • %Program Files%\Print2CAD 2017\pvgviewdxfp2c.exe
    • %Program Files%\Print2CAD 2017\IP2Lib32.dll
  • If the file to be patched is not found, it will ask the user to redirect to the correct path of the file:
  • It displays the following output in a command prompt window:
  • It requires to be executed as an administrator.
  • It requires the following software installed to properly execute its intended routine:
    • PrintCAD 2017 8th 15.xx
  • It is used to patch the software by generating a license key.

It accepts the following parameters:

  • /help → displays the help menu in a command prompt window.
  • /silent → no window GUI, no input
  • /overwrite → overwrite existing files during file attachment export
  • /backup → make backup of every file which is patched
  • /startupworkdir {Directory} → set working directory for the patcher
  • /setvar {Content} → set content of %dup2_cmd_var%

  SOLUTION

Minimum Scan Engine:

9.800

SSAPI PATTERN File:

2.677.00

SSAPI PATTERN Date:

23 Nov 2023

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

Search and delete these files

[ 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%\dup2patcher.dll
  • %User Temp%\bassmod.dll

Step 4

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

Step 5

Restore deleted/modified files and/or registry entries from backup

*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.


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