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RANSOM_MISCHA.E

November 07, 2016
 Analysis by: Byron Jon Gelera
 ALIASES:

Win32/Diskcoder.Petya.A (ESET-NOD32); Trojan-Ransom.Win32.Petr.ci (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


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:

293,888 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

20 Oct 2016

Payload:

Encrypts files, Overwrites MBR

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.

Other Details

This Trojan does the following:

  • This ransomware overwrites the MBR(Master Boot Record)
  • This ransomware encrypts the MFT(Master File Table)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.848.02

FIRST VSAPI PATTERN DATE:

20 Oct 2016

VSAPI OPR PATTERN File:

12.849.00

VSAPI OPR PATTERN Date:

21 Oct 2016

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

Scan your computer with your Trend Micro product to delete files detected as RANSOM_MISCHA.E. 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 4

Restore encrypted files from backup.


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