Analysis by: Martin Xavier Co
ALIASES:

Ransom:Win32/HiddenTear.gen (Microsoft); Ransom.HiddenTear (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: 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.

It connects to certain websites to send and receive information.

It encrypts files with specific file extensions.

  TECHNICAL DETAILS

File Size: 219,136 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 04 Jul 2017
Payload: Connects to URLs/IPs, 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 connects to the following website to send and receive information:

  • https://ranrans.{BLOCKED}hostapp.com/

It does the following:

  • It displays the following after encryption

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .txt
  • .doc
  • .docx
  • .log
  • .msg
  • .odt
  • .pages
  • .rtf
  • .tex
  • .wpd
  • .wps
  • .csv
  • .dat
  • .ged
  • .key
  • .keychain
  • .pps
  • .ppt
  • .pptx
  • .sdf
  • .tar
  • .tax2014
  • .tax2015
  • .vcf
  • .xml
  • .aif
  • .iff
  • .m3u
  • .m4a
  • .mid
  • .mp3
  • .mpa
  • .wav
  • .wma
  • .3g2
  • .3gp
  • .asf
  • .avi
  • .flv
  • .m4v
  • .mov
  • .mp4
  • .mpg
  • .srt
  • .swf
  • .vob
  • .wmv
  • .3dm
  • .3ds
  • .max
  • .obj
  • .lay
  • .onetoc2
  • .dot
  • .bmp
  • .dds
  • .gif
  • .jpg
  • .png
  • .psd
  • .tga
  • .thm
  • .tif
  • .tiff
  • .yuv
  • .backup
  • .ott
  • .eps
  • .svg
  • .docb
  • .indd
  • .pct
  • .pdf
  • .sqlite3
  • .sqlitedb
  • .xlr
  • .xls
  • .xlsx
  • .pfx
  • .accdb
  • .dbf
  • .mdb
  • .pdb
  • .sql
  • .dwg
  • .dxf
  • .asp
  • .aspx
  • .cer
  • .cfm
  • .csr
  • .css
  • .htm
  • .html
  • .jsp
  • .php
  • .rss
  • .xhtml
  • .mml
  • .stc
  • .cbr
  • .deb
  • .pkg
  • .rpm
  • .sitx
  • .tar.gz
  • .zip
  • .zipx
  • .rar
  • .bin
  • .cue
  • .dmg
  • .iso
  • .mdf
  • .toast
  • .vcd
  • .class
  • .cpp
  • .dtd
  • .fla
  • .java
  • .lua
  • .sln
  • .swift
  • .vcxproj
  • .xcodeproj
  • .bak
  • .tmp
  • .crdownload
  • .ics
  • .msi
  • .part
  • .torrent
  • .dll

It appends the following extension to the file name of the encrypted files:

  • {original filename}.ranrans

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.512.02
FIRST VSAPI PATTERN DATE: 04 Jul 2017
VSAPI OPR PATTERN File: 13.513.00
VSAPI OPR PATTERN Date: 05 Jul 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

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

Restore encrypted files from backup.


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