Analysis by: Ryan Paolo Maglaque
ALIASES:

Ransom.HiddenTear!g1(Norton);Ransom:MSIL/Ryzerlo.A(Microsoft)

 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 deletes itself after execution.

It encrypts files with specific file extensions. It drops files as ransom note.

  TECHNICAL DETAILS

File Size: 118,784 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 04 Jun 2017
Payload: Encrypts files, Displays message/message boxes

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 the following files:

  • C:\Users\{username}\ransom.jpg

Other System Modifications

This Ransomware changes the desktop wallpaper by modifying the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = C:\Users\{username}\ransom.jpg

It sets the system's desktop wallpaper to the following image:

Information Theft

This Ransomware gathers the following data:

  • Computer name
  • Username
  • Key

Stolen Information

This Ransomware sends the data it gathers to the following email addresses via SMTP:

  • {BLOCKED}ransom@protonmail.com

Other Details

This Ransomware deletes itself after execution.

Ransomware Routine

This Ransomware encrypts files with the following extensions:

  • .txt
  • .doc
  • .docx
  • .xls
  • .xlsx
  • .ppt
  • .pptx
  • .odt
  • jpeg
  • .png
  • .csv
  • .sql
  • .mdb
  • .sln
  • .php
  • .asp
  • .aspx
  • .html
  • .xml
  • .psd
  • .sql
  • .mp4
  • .7z
  • .rar
  • .m4a
  • .wma
  • .avi
  • .wmv
  • .csv
  • .d3dbsp
  • .zip
  • .sie
  • .sum
  • .ibank
  • .t13
  • .t12
  • .qdf
  • .gdb
  • .tax
  • .pkpass
  • .bc6
  • .bc7
  • .bkp
  • .qic
  • .bkf
  • .sidn
  • .sidd
  • .mddata
  • .itl
  • .itdb
  • .icxs
  • .hvpl
  • .hplg
  • .hkdb
  • .mdbackup
  • .syncdb
  • .gho
  • .cas
  • .svg
  • .map
  • .wmo
  • .itm
  • .sb
  • .fos
  • .mov
  • .vdf
  • .ztmp
  • .sis
  • .sid
  • .ncf
  • .menu
  • .layout
  • .dmp
  • .blob
  • .esm
  • .vcf
  • .vtf
  • .dazip
  • .fpk
  • .mlx
  • .kf
  • .iwd
  • .vpk
  • .tor
  • .psk
  • .rim
  • .w3x
  • .fsh
  • .ntl
  • .arch00
  • .lvl
  • .snx
  • .cfr
  • .ff
  • .vpp_pc
  • .lrf
  • .m2
  • .mcmeta
  • .vfs0
  • .mpqge
  • .kdb
  • .db0
  • .dba
  • .rofl
  • .hkx
  • .bar
  • .upk
  • .das
  • .iwi
  • .litemod
  • .asset
  • .forge
  • .ltx
  • .bsa
  • .apk
  • .re4
  • .sav
  • .lbf
  • .slm
  • .bik
  • .epk
  • .rgss3a
  • .pak
  • .big
  • wallet
  • .wotreplay
  • .xxx
  • .desc
  • .py
  • .m3u
  • .flv
  • .js
  • .css
  • .rb
  • .p7c
  • .pk7
  • .p7b
  • .p12
  • .pfx
  • .pem
  • .crt
  • .cer
  • .der
  • .x3f
  • .srw
  • .pef
  • .ptx
  • .r3d
  • .rw2
  • .rwl
  • .raw
  • .raf
  • .orf
  • .nrw
  • .mrwref
  • .mef
  • .erf
  • .kdc
  • .dcr
  • .cr2
  • .crw
  • .bay
  • .sr2
  • .srf
  • .arw
  • .3fr
  • .dng
  • .jpe
  • .jpg
  • .cdr
  • .indd
  • .ai
  • .eps
  • .pdf
  • .pdd
  • .dbf
  • .mdf
  • .wb2
  • .rtf
  • .wpd
  • .dxg
  • .xf
  • .dwg
  • .pst
  • .accdb
  • .mdb
  • .pptm
  • .pptx
  • .ppt
  • .xlk
  • .xlsb
  • .xlsm
  • .xlsx
  • .xls
  • .wps
  • .docm
  • .docx
  • .doc
  • .odb
  • .odc
  • .odm
  • .odp
  • .ods
  • .odt
  • .png
  • .jpg
  • .rtf
  • .mpg
  • .mp3

It avoids encrypting files with the following strings in their file path:

  • Program Files
  • Program Files (x86)
  • Windows

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

  • .{6 random characters}

It drops the following file(s) as ransom note:

  • {Encrypted File path}\Sifre_Coz_Talimat.html

NOTES:

It displays the following ransom note:

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.454.01
FIRST VSAPI PATTERN DATE: 05 Jun 2017
VSAPI OPR PATTERN File: 13.455.00
VSAPI OPR PATTERN Date: 06 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.  
  • {Encrypted File path}\Sifre_Coz_Talimat.html
  • C:\Users\{username}\ransom.jpg

Step 4

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

Reset your Desktop properties

[ Learn More ]

Step 6

Restore encrypted files from backup.


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