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RANSOM_BLACKMAIL.A

August 14, 2017
 ALIASES:

Trojan.GenericKD.5309913 (Bitdefender); Ransom.Blackmail.Gen!c (AegisLab)

 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:

17,920 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

01 Jun 2017

Payload:

Drops 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.

Installation

This Ransomware drops and executes the following files:

  • %User Temp%\{Temp File Name}.html

Other Details

This Ransomware displays the following message boxes:

BlackMail Infection


It does the following:

  • It displays the following in the message box:
    • All logical drives and its drive type (i.e. Fixed, Removable, or Network)
    • The total number of files and folders located at the drive root
    • A file within the first 100 that has one of the following extension names:
      • .doc
      • .docx
      • .xls
      • .xlsx
      • .msg
      • .pdf
      • .csv
    • An encrypted string of the whole message
  • It contains an uncalled function which has the capability to provide HTTP request to "https://twitter.com/search?q={URL encoded string}&src=typd"

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.444.04

FIRST VSAPI PATTERN DATE:

01 Jun 2017

VSAPI OPR PATTERN File:

13.445.00

VSAPI OPR PATTERN Date:

02 Jun 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

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%\{Temp File Name}.html

Step 4

Scan your computer with your Trend Micro product to delete files detected as RANSOM_BLACKMAIL.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.


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