Ransom.Win32.DOGECRYPT.A
Ransom:Win32/InsaneCrypt.A (MICROSOFT); Trojan-Ransom.FileCrypter (IKARUS)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
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
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:
- %Application Data%\AppData\Roaming\Microsoft\Crypto\RSA\{User ID}
- %System Root%\desucryptKeyContainer.info
- %System Root%\DOGECRYPTinfo.jpg - used as wallpaper
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It adds the following processes:
- cmd.exe / c vssadmin delete shadows / all / quiet & wmic shadowcopy delete & bcdedit / set{ default } bootstatuspolicy ignoreallfailures & bcdedit / set{ default } recoveryenabled no & wbadmin delete catalog - quiet
Other System Modifications
This Ransomware adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer
GlobalAssocChangedCounter = 36
It changes the desktop wallpaper by modifying the following registry entries:
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = %System Root%\DOGECRYPTinfo.jpg
It sets the system's desktop wallpaper to the following image:
Other Details
This Ransomware encrypts files with the following extensions:
- 123
- 3dm
- 3ds
- 3g2
- 3gp
- 602
- 7z
- accdb
- aes
- ai
- ARC
- asc
- asf
- asm
- asp
- avi
- backup
- bak
- bat
- bmp
- brd
- bz2
- c
- cgm
- class
- cmd
- cpp
- crt
- cs
- csr
- css
- csv
- dat
- db
- dbf
- dch
- der
- dif
- dip
- djvu
- doc
- docb
- docm
- docx
- dot
- dotm
- dotx
- dwg
- edb
- eml
- fla
- flv
- frm
- gif
- gpg
- gz
- h
- html
- hwp
- ibd
- IMG
- iso
- jar
- java
- jpeg
- jpg
- js
- jsp
- key
- lay
- lay6
- ldf
- m3u
- m4u
- max
- mdb
- mdf
- mid
- mkv
- mlm
- mov
- mp3
- mp4
- mpeg
- mpg
- msg
- myd
- myi
- nef
- odb
- odg
- odp
- ods
- odt
- onetoc2
- ost
- otg
- otp
- ots
- ott
- p12
- PAQ
- pas
- pem
- pfx
- php
- pl
- png
- pot
- potm
- potx
- ppam
- pps
- ppsm
- ppsx
- ppt
- pptm
- pptx
- ps1
- psd
- pst
- py
- rar
- raw
- rb
- rtf
- sch
- sh
- sldm
- sldx
- slk
- sln
- snt
- sql
- sqlite3
- sqlitedb
- stc
- std
- sti
- stw
- suo
- svg
- swf
- sxc
- sxd
- sxi
- sxm
- sxw
- tar
- tbk
- tgz
- tif
- tiff
- txt
- uop
- uot
- vb
- vbs
- vcd
- vdi
- vmdk
- vmx
- vob
- vsd
- vsdx
- wav
- wb2
- wk1
- wks
- wma
- wmv
- xlc
- xlm
- xls
- xlsb
- xlsm
- xlsx
- xlt
- xltm
- xltx
- xlw
- zip
Ransomware Routine
This Ransomware avoids encrypting files with the following strings in their file path:
- Default
- All Users
- Content.IE5
- Temporary Internet Files
- Local Settings
- AppData
- Program Files (x86)
- Program Files
- Windows
- Microsoft
- Program Data
- ProgramData
- Intel
- $Recycle.Bin
It renames encrypted files using the following names:
- {Encrypted directory}\{original filename}.{original extension}.[{BLOCKED}membersss@{BLOCKED}mail.ch].DogeCrypt
It leaves text files that serve as ransom notes containing the following text:
- %Public%\Desktop\note.txt
SOLUTION
Step 1
Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:
- Troj.Win32.TRX.XXPE50FFF036
Step 2
Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.
Step 3
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 4
Identify and terminate files detected as Ransom.Win32.DOGECRYPT.A
- Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 5
Search and delete this file
- %Application Data%\AppData\Roaming\Microsoft\Crypto\RSA\{User ID}
- %System Root%\desucryptKeyContainer.info
- %System Root%\DOGECRYPTinfo.jpg
- %Public%\Desktop\note.txt
Step 6
Enabling Volume Shadow Service
- Run the command prompt (cmd.exe) as administrator.
- Enable Volume Shadow Service by typing the following command:
net start vss
Step 7
Enabling Windows Error Recovery
- Run the command prompt (cmd.exe) as administrator.
- Enable Windows Error Recovery Screen on Startup by typing the following command:
bcdedit /set {default} bootstatuspolicy displayallfailures
Step 8
Reset your Desktop properties
Step 9
Restore encrypted files from backup.
Step 10
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win32.DOGECRYPT.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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