RANSOM_CRYBRZ.THFDAAH
Ransom:MSIL/Ryzerlo.A (Microsoft), HEUR:Trojan.Win32.Generic (Kaspersky), Ransom.HiddenTear (MalwareBytes)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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 encrypts files with specific file extensions. It encrypts files found in specific folders.
TECHNICAL DETAILS
222,720 bytes
EXE
No
04 Jun 2018
Drops files, Connects to URLs/IPs, Collects system information, Downloads files, 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.
Installation
This Ransomware drops the following files:
- %Desktop%\SUA_CHAVE.html - infection marker
(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It drops the following copies of itself into the affected system:
- %System Root%\{User Name}\Rand123\local.exe
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It creates the following folders:
- %System Root%\{User Name}
- %System Root%\{User Name}\Rand123
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Other System Modifications
This Ransomware modifies the following registry entries:
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%System Root%\{User Name}\ranso4.jpg"
(Note: The default value data of the said registry entry is {User preference}.)
It sets the system's desktop wallpaper to the following image:
Download Routine
This Ransomware accesses the following websites to download files:
- http://{BLOCKED}.{BLOCKED}p.blogspot.com/-11m8rWaFmWs/WuhochGTK0I/AAAAAAAAFTY/VkbbVhxYZDgW_jlbQ5lPbV8AEhyd4ihgQCK4BGAYYCw/s1600/ranso4.jpg
It saves the files it downloads using the following names:
- %System Root%\{User Name}\ranso4.jpg - Ransom Note
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
Information Theft
This Ransomware gathers the following data:
- Machine Name
- User Name
Stolen Information
This Ransomware sends the gathered information via HTTP POST to the following URL:
- http://{BLOCKED}3r2213122c1cxdsxsd.{BLOCKED}x.com/crybrazil/write.php?info={Machine Name}-{User name}_732%20AA151257B1462D642E7E21FF9C80F83CAF043C3572D5ED59BD283D20641E3C9D
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .123
- .602
- .3dm
- .3ds
- .3g2
- .3gp
- .7z
- .accdb
- .aes
- .ai
- .aif
- .apk
- .app
- .asc
- .asf
- .asm
- .asp
- .aspx
- .avi
- .backup
- .bak
- .bat
- .bmp
- .brd
- .bz2
- .c
- .cbr
- .cer
- .cfg
- .cfm
- .cgi
- .cgm
- .class
- .cmd
- .com
- .cpp
- .crt
- .cs
- .csr
- .css
- .csv
- .dat
- .db
- .dbf
- .dch
- .dds
- .deb
- .dem
- .der
- .dif
- .dip
- .djvu
- .doc
- .docb
- .docm
- .docx
- .dot
- .dotm
- .dotx
- .dwg
- .edb
- .eml
- .eps
- .fla
- .flv
- .fnt
- .fon
- .fpx
- .frm
- .gam
- .ged
- .gif
- .gpg
- .gz
- .h
- .htm
- .html
- .hwp
- .ibd
- .ics
- .iff
- .indd
- .iso
- .j2c
- .j2k
- .jar
- .java
- .jfif
- .jif
- .jp2
- .jpeg
- .jpg
- .jpx
- .js
- .json
- .jsp
- .key
- .keychain
- .lay
- .lay6
- .ldf
- .log
- .lua
- .m3u
- .m4a
- .m4u
- .m4v
- .max
- .mdb
- .mdf
- .mht
- .mhtml
- .mid
- .mkv
- .mml
- .mov
- .mp3
- .mp4
- .mpa
- .mpeg
- .mpg
- .msg
- .msi
- .myd
- .myi
- .nef
- .nes
- .obj
- .odb
- .odg
- .odp
- .ods
- .odt
- .old
- .onetoc2
- .ost
- .otf
- .otg
- .otp
- .ots
- .ott
- .p12
- .pages
- .PAQ
- .pas
- .pcd
- .pct
- .pem
- .pfx
- .php
- .pkg
- .pl
- .png
- .pot
- .potm
- .potx
- .ppam
- .pps
- .ppsm
- .ppsx
- .ppt
- .pptm
- .pptx
- .prf
- .prn
- .ps
- .ps1
- .psd
- .pst
- .py
- .rar
- .raw
- .rb
- .rm
- .rom
- .rpm
- .rss
- .rtf
- .sav
- .sch
- .sdf
- .sh
- .sldm
- .sldx
- .slk
- .sln
- .snt
- .sql
- .sqlite3
- .sqlitedb
- .srt
- .stc
- .std
- .sti
- .stw
- .suo
- .svg
- .swf
- .swift
- .sxc
- .sxd
- .sxi
- .sxm
- .sxw
- .tar
- .tbk
- .tex
- .tga
- .tgz
- .thm
- .tif
- .tiff
- .tmp
- .torrent
- .ttf
- .txt
- .uop
- .uot
- .vb
- .vbs
- .vcd
- .vcf
- .vcxproj
- .vdi
- .vmdk
- .vmx
- .vob
- .vsd
- .vsdx
- .wav
- .wb2
- .wk1
- .wks
- .wma
- .wmv
- .wpd
- .wps
- .xhtml
- .xla
- .xlam
- .xlc
- .xlm
- .xls
- .xlsb
- .xlsm
- .xlsx
- .xlt
- .xltm
- .xltx
- .xlw
- .xml
- .xps
- .yuv
- .zip
- .zipx
It encrypts files found in the following folders:
- %Desktop%
- %User Profile%\My Documents
- %User Profile%\Downloads
- %User Profile%\My Pictures
- %User Profile%\My Music
- %User Profile%\My Videos
(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
SOLUTION
9.850
14.294.02
04 Jun 2018
14.295.00
05 Jun 2018
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
Restore this modified registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Control Panel\Desktop
- From: Wallpaper = "%System Root%\{User Name}\ranso4.jpg"
To: Wallpaper = "{User Preference}"
- From: Wallpaper = "%System Root%\{User Name}\ranso4.jpg"
Step 4
Search and delete these folders
- %System Root%\{User Name}
Step 5
Search and delete this file
- %Desktop%\SUA_CHAVE.html
Step 6
Scan your computer with your Trend Micro product to delete files detected as RANSOM_CRYBRZ.THFDAAH. 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 the following Trend Micro Support pages for more information:
Step 7
Restore encrypted files from backup.
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