Analysis by: Marvelous Pelin
ALIASES:

Ransom.JeepersCrypt(Malwarebytes)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

This Ransomware 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: 573,952 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 24 Apr 2017
Payload: Displays message/message boxes, Encrypts files

Arrival Details

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

Other Details

This Ransomware does the following:

  • It encrypts files in the following folders:
    • %Desktop%
    • %User Profile%\Music
    • %User Profile%\Pictures
    • %User Profile%\Videos
  • It requires the following key in order to decrypt the encrypted files:
    • "Y29uaGVjaW1lbnRvIG5hbyBlIGNyaW1lIGNyaW1lIHNlciBidXJybyBlIGJhaXhhciBxdWFscXVlciBtZXJkYSBuYSBpbnRlcm5ldCBhY2hhbmRvIHF1ZSB2YWkgc2UgDQpkYXIgYmVtIGlzc28gZSBwcmEgdm9jZXMgYXByZW5kZXIgYSBuYW8gYmFpeGFyIG1haXMgbWVyZGEgbmEgaW50ZXJuZXQgc2V1cyBvdGFyaW9z"

  • It displays the following if the correct key is inputted:

  • It displays the following after decrypting the encrypted files:

  • It displays the following if the inputted key is incorrect:

Ransomware Routine

This Ransomware renames encrypted files using the following names:

  • {original filename and extension}.jeepers

NOTES:

This ransomware displays the following after encryption:

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.368.07
FIRST VSAPI PATTERN DATE: 24 Apr 2017
VSAPI OPR PATTERN File: 13.369.00
VSAPI OPR PATTERN Date: 25 Apr 2017

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

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

Restart in Safe Mode

[ Learn More ]

Step 4

Scan your computer with your Trend Micro product to delete files detected as RANSOM_STUPJEEPERS.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 this Knowledge Base page for more information.

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_STUPJEEPERS.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 this Knowledge Base page for more information.

Step 6

Restore encrypted files from backup.


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