PUA.Win32.DiskCrypt.A

August 30, 2019
 Analysis by: Henry Alarcon Jr.
 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Potentially Unwanted Application may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

125,952 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

30 Aug 2019

Arrival Details

This Potentially Unwanted Application may be dropped by the following malware:

Other Details

This Potentially Unwanted Application does the following:

  • It needs the following files to run properly:
    • {Malware File Path}\dcapi.dll
  • It display the following in command prompt if the following condition is met:
    • If executed in 64bit machine:
      • Please use x64 version of DiskCryptor
    • If not executed with admin privileges:
      • Administrator privilegies required
    • If executed without arguments and also accept the following parameters:
      • General paramenters:
        • -enum = Enum all volume devices in system
        • -info [dev] = Display information about device
        • -version = Display DiskCryptor version
        • -benchmark = Encryption benchmark
        • -config = Change program configuration
        • -keygen [file] = Make 64 bytes random keyfile
        • -bsod = Erase all keys in memory and generate BSOD
      • Password parameters:
        • -addpass [param] = Add password to password cache
          • -p[password] = Get password from command line
          • -kf [keyfiles path] = Use keyfiles
        • -cleanWipe = cached passwords in memory
      • Mount parameters:
        • -mount [dev] [param] = Mount encrypted device
          • -mp [mount point] = Add volume mount point
          • -p[password] = Get password from command line
          • -kf [keyfiles path] = Use keyfiles
        • -mountall [param] = Mount all encrypted devices
          • -p[password] = Get password from command line
          • -kf [keyfiles path] = Use keyfiles
        • -unmount [dev] [param] = Unmount encrypted device
          • -f= Force unmount with close all opened files
          • -dp = Delete volume mount point
        • -unmountall = Force unmount all devices
      • Encryption parameters:
        • -encrypt [dev] [param] = Encrypt volume device
          • -p [password] = Get password from command line
          • -kf [keyfiles path] = Use keyfiles
          • Cipher settings:
            • -a = AES cipher
            • -t = Twofish cipher
            • -s = Serpent cipher
            • -at = AES-Twofish ciphers chain
            • -ts = Twofish-Serpent ciphers chain
            • -sa = Serpent-AES ciphers chain
            • -ats = AES-Twofish-Serpent ciphers chain
          • Data wipe settings:
            • -dod_e = US DoD 5220.22-M (8-306./E)
            • -dod = US DoD 5220.22-M (8-306./E, C and E)
            • -g = Gutmann mode
        • -decrypt [dev] [param] = Decrypt volume device
          • -p [password] = Get password from command line
          • -kf [keyfiles path] = Use keyfiles
        • -reencrypt [dev] [param] = Re-encrypt device with new parameters, parameters are equal to -encrypt
        • -format [dev] [param] = Format volume device with encryption, parameters are equal to -encrypt
          • -q = Quick format
          • -fat = Format to FAT file system
          • -fat32 = Format to FAT32 file system
          • -exfat = Format to exFAT file system
          • -ntfs = Format to NTFS file system
          • -raw = File system does not needed
        • -enciso [src] [dst] [param] = Encrypt .iso image, parameters are equal to -encrypt
      • Boot parameters:
        • -boot [action]
          • -enum = Enumerate all HDDs
          • -config [hdd/file] = Change bootloader configuration
          • -setmbr [hdd] [opt] = Setup bootloader to HDD master boot record
          • -updmbr [hdd] = Update bootloader on HDD master boot record
          • -delmbr [hdd] = Delete bootloader from HDD master boot record
          • -setpar [root par] [opt] = Setup bootloader to bootable partition
          • -makeiso [file] [opt] = Make bootloader image (.iso)
          • -makepxe [file] [opt] = Make bootloader image for PXE network booting
            • -small = Use small bootloader, only with AES
      • Other paramenters:
        • -chpass [dev] [param] = Change volume password
          • -op [password] = Get old password from command line
          • -np [password] = Get new password from command line
          • -okf [keyfiles path] = Old keyfiles
          • -nkf [keyfiles path] = New keyfiles
        • -backup [dev] [file] [param] = Backup volume header to file
          • -p [password] = Get password from command line
          • -kf [keyfiles path] = Use keyfiles
        • -restore [dev] [file] [param] = Restore volume header from file
          • -p [password] = Get password from command line
          • -kf [keyfiles path] = Use keyfiles

  SOLUTION

Minimum Scan Engine:

9.850

SSAPI PATTERN File:

2.211.00

SSAPI PATTERN Date:

05 Sep 2019

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

Identify and terminate files detected as PUA.Win32.DiskCrypt.A

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.DiskCrypt.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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