RANSOM_DILMALOCKER.A
Ransom.Wannacry (NORTON); Win32/Filecoder.DilmaLocker.A trojan (NOD32); W32/Filecoder_DilmaLocker.A!tr (FORTINET)
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.
It encrypts files found in specific folders. It drops files as ransom note.
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:
- %Desktop%\dilminha.dat
- %Desktop%\background.bmp
(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 and executes the following files:
- %User Profile%\Documents\03cfef087143723d911484f9568dcf63.exe
(Note: %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.)
Other System Modifications
This Ransomware changes the desktop wallpaper by modifying the following registry entries:
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = %Desktop%\background.bmp
Other Details
This Ransomware encrypts files with the following extensions:
- doc
- docx
- xls
- xlsx
- ppt
- pptx
- pst
- ost
- msg
- eml
- vsd
- vsdx
- txt
- csv
- rtf
- 123
- wks
- wk1
- dwg
- onetoc2
- snt
- jpeg
- jpg
- docb
- docm
- dot
- dotm
- dotx
- xlsm
- xlsb
- xlw
- xlt
- xlm
- xlc
- xltx
- xltm
- pptm
- pot
- pps
- ppsm
- ppsx
- ppam
- potx
- potm
- edb
- hwp
- 602
- sxi
- sti
- sldx
- sldm
- gpg
- aes
- ARC
- PAQ
- bz2
- tbk
- bak
- tar
- tgz
- gz
- 7z
- rar
- zip
- backup
- iso
- vcd
- bmp
- png
- gif
- raw
- cgm
- tif
- tiff
- nef
- psd
- ai
- svg
- djvu
- m4u
- m3u
- mid
- wma
- flv
- 3g2
- mkv
- 3gp
- mp4
- mov
- avi
- asf
- mpeg
- vob
- mpg
- wmv
- fla
- swf
- wav
- mp3
- sh
- class
- jar
- java
- rb
- asp
- php
- jsp
- brd
- sch
- dch
- dip
- pl
- vb
- vbs
- ps1
- bat
- cmd
- js
- asm
- h
- pas
- cpp
- c
- cs
- suo
- sln
- ldf
- mdf
- ibd
- myi
- myd
- frm
- odb
- dbf
- db
- mdb
- accdb
- sql
- sqlitedb
- sqlite3
- asc
- lay6
- lay
- mml
- sxm
- otg
- odg
- uop
- std
- sxd
- otp
- odp
- wb2
- slk
- dif
- stc
- sxc
- ots
- ods
- 3dm
- max
- 3ds
- uot
- stw
- sxw
- ott
- odt
- pem
- p12
- csr
- crt
- key
- pfx
- der
- kdbx
Ransomware Routine
This Ransomware encrypts files found in the following folders:
- {Drive Letter}:\
It avoids encrypting files with the following strings in their file path:
- ProgramData
- PerfLogs
- $Recycle.Bin
- Arquivos de Programas
- WINDOWS
- System Volume Information
- Microsoft
- Arquivos de programas
It appends the following extension to the file name of the encrypted files:
- .dilmaV1
It drops the following file(s) as ransom note:
- %Desktop%\RECUPERE_SEUS_ARQUIVOS.html
(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.)
NOTES:
This ransomware displays this wallpaper image in %Desktop%\background.bmp
When %Desktop%\RECUPERE_SEUS_ARQUIVOS.html is opened, the following is also displayed:
SOLUTION
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
- %Desktop%\dilminha.dat
- %Desktop%\RECUPERE_SEUS_ARQUIVOS.html
- %Desktop%\background.bmp
- %User Profile%\Documents\03cfef087143723d911484f9568dcf63.exe
Step 4
Scan your computer with your Trend Micro product to delete files detected as RANSOM_DILMALOCKER.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
Step 6
Restore encrypted files from backup.
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