RANSOM_WCRY.A
Ransom_WANA (Trend), Win32/Filecoder.WannaCryptor.A (ESET-NOD32), Ransom:Win32/FileCryptor (Microsoft)
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Trojan 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 Trojan 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 Trojan drops the following component file(s):
- {location of malware}\00000000.key
- {location of malware}\00000000.res
- {location of malware}\00000000.dat
- {location of malware}\taskmsgr.exe - contains ransom note
- {location of malware}\a.lnk - targets taskmsgr.exe
- {location of malware}\t1.wry
- {location of malware}\t2.wry
- {location of malware}\cg.wy
- {location of malware}\TaskHost\Tor\taskhosts.exe - copy of tor.exe
- {folders containing encrypted files}\---HOW_TO_DECRYPT_FILES---.LNK - targets taskmsgr.exe
- %Desktop%\HOW_TO_DECRYPT_FILES---.LNK - targets taskmsgr.exe
(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 adds the following processes:
- taskmsgr.exe
- taskhosts.exe
It creates the following folders:
- {location of malware}\TaskHost
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Microsoft Task Scheduler = "{location of malware}\{malware filename}.exe" /r 0
Download Routine
This Trojan accesses the following websites to download files:
- https://www.{BLOCKED}ject.org/dist/torbrowser/6.0.8/tor-win32-0.2.8.11.zip
It saves the files it downloads using the following names:
- %Temporary Internet Files%\tor-win32-0.2.8.11.zip
(Note: %Temporary Internet Files% is the Temporary Internet Files folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temporary Internet Files on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Microsoft\Windows\Temporary Internet Files on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), and Windows Server 2008; C:\Users\{user name}\AppData\Local\Microsoft\Windows\INetCache on Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), and Windows Server 2012.)
Other Details
This Trojan encrypts files with the following extensions:
- .123
- .3dm
- .3ds
- .3g2
- .3gp
- .602
- .7z
- .aes
- .ai
- .ARC
- .asc
- .asf
- .asp
- .avi
- .backup
- .bak
- .bmp
- .brd
- .bz2
- .c
- .cgm
- .class
- .cpp
- .crt
- .cs
- .csr
- .csv
- .db
- .dbf
- .dch
- .dif
- .dip
- .doc
- .docb
- .docm
- .docx
- .dot
- .dotm
- .dotx
- .dwg
- .edb
- .eml
- .fla
- .flv
- .frm
- .gif
- .gpg
- .gz
- .h
- .hwp
- .ibd
- .jar
- .java
- .jpeg
- .jpg
- .js
- .jsp
- .key
- .lay
- .lay6
- .ldf
- .m3u
- .m4u
- .max
- .mdb
- .mdf
- .mid
- .mkv
- .mml
- .mov
- .mp3
- .mp4
- .mpeg
- .mpg
- .msg
- .myd
- .myi
- .nef
- .odb
- .odg
- .odp
- .ods
- .odt
- .ost
- .otg
- .otp
- .ots
- .ott
- .p12
- .PAQ
- .pas
- .pem
- .php
- .pl
- .png
- .pot
- .potm
- .potx
- .ppam
- .pps
- .ppsm
- .ppsx
- .ppt
- .pptm
- .pptx
- .psd
- .pst
- .rar
- .raw
- .rb
- .rtf
- .sch
- .sh
- .slk
- .sln
- .sql
- .sqlite3
- .sqlitedb
- .stc
- .std
- .stw
- .suo
- .swf
- .sxc
- .sxd
- .sxm
- .sxw
- .tar
- .tar
- .tbk
- .tgz
- .tif
- .tiff
- .txt
- .uop
- .uot
- .vb
- .vdi
- .vmdk
- .vmx
- .vob
- .vsd
- .vsdx
- .wav
- .wb2
- .wk1
- .wks
- .wma
- .wmv
- .xlc
- .xlm
- .xls
- .xlsb
- .xlsm
- .xlsx
- .xlt
- .xltm
- .xltx
- .xlw
- .zip
It renames encrypted files using the following names:
- {original filename and extension}.wcry
It does the following:
- This ransomware extracts the downloaded zip file in the {location of malware}\TaskHost folder.
- The downloaded zip file contains the following files:
- Data\Tor\geoip
- Data\Tor\geoip6
- Tor\libeay32.dll
- Tor\libevent-2-0-5.dll
- Tor\libevent_core-2-0-5.dll
- Tor\libevent_extra-2-0-5.dll
- Tor\libgcc_s_sjlj-1.dll
- Tor\libssp-0.dll
- Tor\ssleay32.dll
- Tor\tor-gencert.exe
- Tor\tor.exe
- Tor\zlib1.dll
- This ransomware deletes shadow copies by executing the following command:
- vssadmin.exe Delete Shadows /All /Quiet
- This ransomware avoids encrypting file with the following strings in their file path:
- AppData
- \Users\
- \ProgramData
- \Program Files (x86)
- \Program Files
- \Windows
NOTES:
This ransomware displays the following window as ransom note:
After clicking the "Start Decrypt" button, it displays the following window:
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
Restart in Safe Mode
Step 4
Delete this 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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
- Microsoft Task Scheduler = "{location of malware}\{malware filename}.exe" /r 0
- Microsoft Task Scheduler = "{location of malware}\{malware filename}.exe" /r 0
Step 5
Search and delete these folders
- {location of malware}\TaskHost
Step 6
Search and delete these files
- {location of malware}\00000000.key
- {location of malware}\00000000.res
- {location of malware}\00000000.dat
- {location of malware}\taskmsgr.exe
- {location of malware}\a.lnk
- {location of malware}\t1.wry
- {location of malware}\t2.wry
- {location of malware}\cg.wy
- {folders containing encrypted files}\---HOW_TO_DECRYPT_FILES---.LNK
- %Desktop%\HOW_TO_DECRYPT_FILES---.LNK
- %Temporary Internet Files%\tor-win32-0.2.8.11.zip
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_WCRY.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 8
Restore encrypted files from backup.
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