RANSOM_XORIST.F
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet
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
7,680 bytes
EXE
No
16 Jun 2017
Encryps files
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 file(s)/component(s):
- %User Temp%\{random value}.exe
- %User Profile%\Desktop\READ TO DECRYPTIONS_.txt
- %All Users Profile%\Microsoft\Windows\Start Menu\Programs\Startup\READ TO DECRYPTIONS_.txt
- {folders containing encrypted files}\READ TO DECRYPTIONS_.txt
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on 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.. %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData on 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 leaves text files that serve as ransom notes containing the following:
- All your data files are crypted.
To decrypt files and gain access to them,
please send 0.5 Bitcoin to address
1G3uZtTUN8J3Wd9iQxft6Xej8BWh5EBHhz
and email to xg9739517395nb@163.com proof
(screen or TransID) of your payment.
After receiving the money, I will send you
your password and decrypt instruction via email.
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.rtyrtyrty
(Default) = "VKKYOEBUQZTVGTN"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
VKKYOEBUQZTVGTN
(Default) = "CRYPTED!"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
VKKYOEBUQZTVGTN\DefaultIcon
(Default) = "%User Temp%\{random value}.exe,0"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
VKKYOEBUQZTVGTN\shell\open\
command
(Default) = "%User Temp%\{random value}.exe"
Other Details
This Trojan encrypts files with the following extensions:
- *.zip
- *.rar
- *.tar
- *.gzip
- *.jpg
- *.jpeg
- *.psd
- *.cdr
- *.dwg
- *.max
- *.bmp
- *.gif
- *.png
- *.doc
- *.docx
- *.xls
- *.xlsx
- *.ppt
- *.pptx
- *.txt
- *.djvu
- *.htm
- *.html
- *.mdb
- *.cer
- *.p12
- *.pfx
- *.kwm
- *.pwm
- *.1cd
- *.mdf
- *.dbf
- *.odt
- *.vob
- *.ifo
- *.lnk
- *.torrent
- *.mov
- *.m2v
- *.3gp
- *.mpeg
- *.mpg
- *.flv
- *.avi
- *.mp4
- *.wmv
- *.divx
- *.mkv
- *.mp3
- *.wav
- *.flac
- *.ape
- *.wma
- *.edb
- *.ndf
- *.ldf
- *.vhdx
- *.vhd
- *.vmdk
- *.tis
- *.accdb
- *.iso
- *.wim
- *.WIM
- *.msg
- *.vcf
- *.mbdb
- *.plist
- *.ZIP
- *.RAR
- *.bak
- *.BAK
- *.backup
- *.ldb
- *.QBB
- *.qbb
- *.probkp
- *.mde
- *.sql
- *.SQL
- *.001
- *.002
- *.003
- *.004
- *.005
- *.006
- *.007
- *.008
- *.009
- *.adm
- *.ADM
- *.hsh
- *.sn1
- *.sn2
- *.sn3
- *.sna
- *.spf
- *.report
- *.v2i
- *.bkf
- *.pst
- *.nsf
- *.aspx
- *.flf
- *.900
- *.trp
- *.xtbl
- *.cerber
- *.crypt
- *.bac
- *.CrySiS
- *.ac3
It renames encrypted files using the following names:
- {original filename and extension}.rtyrtyrty
- {original filename and extension}.scydbDmbug0182K
SOLUTION
9.800
12.634.02
06 Jul 2016
12.635.00
07 Jul 2016
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
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\Classes\.rtyrtyrty
- (Default) = "VKKYOEBUQZTVGTN"
- (Default) = "VKKYOEBUQZTVGTN"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\VKKYOEBUQZTVGTN
- (Default) = "CRYPTED!"
- (Default) = "CRYPTED!"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\VKKYOEBUQZTVGTN\DefaultIcon
- (Default) = "%User Temp%\{random value}.exe,0"
- (Default) = "%User Temp%\{random value}.exe,0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\VKKYOEBUQZTVGTN\shell\open\command
- (Default) = "%User Temp%\{random value}.exe"
- (Default) = "%User Temp%\{random value}.exe"
Step 4
Scan your computer with your Trend Micro product to delete files detected as RANSOM_XORIST.F. 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
Restore encrypted files from backup.
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