Ransom.MSIL.CYBORG.AA
Ransom:Win32/Genasom!MTB (MICROSOFT); HEUR:Trojan-Ransom.MSIL.Gen.gen (KASPERSKY)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted:
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 connects to certain websites to send and receive information.
It encrypts files with specific file extensions. 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 adds the following folders:
- %ProgramData%\Microsoft\Network\Connections\Cm\NyanCat
(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.)
It drops the following files:
- {Drive Letter}\bot.exe → detected as Ransom.MSIL.CYBORG.SMTH
- {Drive Letter}\autorun.inf → automatically executes .\bot.exe
It drops and executes the following files:
- %User Temp%\tmp{4-random-characters}.tmp.exe → detected as Ransom.MSIL.CYBORG.SMTH
- %Temp%\{8-random-characters}.inf → contains command for executing %User Temp%\tmp{4-random-characters}.tmp.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.)
It adds the following processes:
- %System%\cmstp.exe /au %Temp%\{8-random-characters}.inf
- %Program Files%\Internet Explorer\iexplore.exe -nohome
(Note: %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)
It modifies file attributes to make files hidden.
Other System Modifications
This Ransomware modifies the following registry entries:
HKEY_CURRENT_USER\Control Panel\Desktop
WallpaperStyle = 2
HKEY_CURRENT_USER\Control Panel\Desktop
TileWallpaper = 0
HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "{Malware Directory}\Cyborg_DECRYPT.jpg"
It sets the system's desktop wallpaper to the following image:
- {Malware Directory}\Cyborg_DECRYPT.jpg
Other Details
This Ransomware adds the following registry keys:
HKEY_CURRENT_USER\Software\ShortCutInfection
{Malware Filename}.{Malware Filename} = "True"
It connects to the following website to send and receive information:
- https://{BLOCKED}o.co/2f8nx5
It does the following:
- It displays the following user interface once executed:
Ransomware Routine
This Ransomware encrypts files with the following extensions:
- .txt
- .doc
- .docx
- .mp3
- .xls
- .xlsx
- .ppt
- .sql
- .wmv
- .mp4
- .iso
- .dll
- .jar
- .pptx
- .odt
- .jpg
- .tar
- .gz
- .bmp
- .pbm
- .rtf
- .png
- .csv
- .mdb
- .sln
- .phpavi
- .mov
- .flv
- .amv
- .mpv
- .mtv
- .asp
- .aspx
- .html
- .xml
- .psd
- .exe
- .rv
- .rvx
- .ved
- .wm
- .rar
- .xwmv
- .wma
- .midi
- .fla
- .ico
- .gif
- .ogg
- .mpg
- .icns
- .zip
- .BAT
- .c
- .7z
- .EXEsql
- .m4a
- .avi
- .d3dbsp
- .sie
- .sum
- .ibank
- .t13
- .t12
- .qdf
- .gdb
- .tax
- .pkpass
- .bc6
- .bc7
- .bkp
- .qic
- .bkf
- .sidn
- .sidd
- .mddata
- .itl
- .itdb
- .icxs
- .hvpl
- .hplg
- .hkdb
- .mdbackup
- .syncdb
- .gho
- .cas
- .svg
- .map
- .wmo
- .itm
- .sb
- .fos
- .vdf
- .ztmp
- .sis
- .sid
- .ncf
- .menu
- .layout
- .dmp
- .blob
- .esm
- .vcf
- .vtf
- .dazip
- .fpk
- .mlx
- .kf
- .iwd
- .vpk
- .tor
- .psk
- .rim
- .w3x
- .fsh
- .ntl
- .arch00
- .lvl
- .snx
- .cfr
- .ff
- .vpp_pc
- .lrf
- .m2
- .mcmeta
- .vfs0
- .mpqge
- .kdb
- .db0
- .dba
- .rofl
- .hkx
- .bar
- .upk
- .das
- .iwi
- .litemod
- .asset
- .forge
- .ltx
- .bsa
- .apk
- .re4
- .sav
- .lbf
- .slm
- .bik
- .epk
- .rgss3a
- .pak
- .bigwallet
- .wotreplay
- .xxx
- .desc
- .py
- .m3u
- .js
- .css
- .rb
- .jpeg
- .p7c
- .p7b
- .p12
- .pfx
- .pem
- .crt
- .cer
- .der
- .x3f
- .srw
- .pef
- .ptx
- .r3d
- .rw2
- .rwl
- .raw
- .raf
- .orf
- .nrw
- .mrwref
- .mef
- .erf
- .kdc
- .dcr
- .cr2
- .crw
- .bay
- .sr2
- .srf
- .arw
- .3fr
- .dng
- .jpe
- .cdr
- .indd
- .ai
- .eps
- .pdd
- .dbf
- .mdf
- .wb2
- .wpd
- .dxg
- .xf
- .dwg
- .pst
- .accdb
- .pptm
- .xlk
- .xlsb
- .xlsm
- .wps
- .docm
- .odb
- .odc
- .odm
- .odp
- .ods
It appends the following extension to the file name of the encrypted files:
- .petya
It drops the following file(s) as ransom note:
- %Desktop%\Cyborg_DECRYPT.txt
- %User Profile%\Music\Cyborg_DECRYPT.txt
- %User Profile%\Pictures\Cyborg_DECRYPT.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.XXPE50FFF034
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
Restart in Safe Mode
Step 5
Delete this registry key
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\Software\ShortCutInfection
- {Malware Filename}.{Malware Filename} = "True"
- {Malware Filename}.{Malware Filename} = "True"
Step 6
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
- WallpaperStyle = 2
- WallpaperStyle = 2
- In HKEY_CURRENT_USER\Control Panel\Desktop
- TileWallpaper = 0
- TileWallpaper = 0
- In HKEY_CURRENT_USER\Control Panel\Desktop
- Wallpaper = "%{Malware Directory}%\Cyborg_DECRYPT.jpg"
- Wallpaper = "%{Malware Directory}%\Cyborg_DECRYPT.jpg"
Step 7
Search and delete this file
- {Drive Letter}\bot.exe
- {Drive Letter}\autorun.inf
- %User Temp%\tmp{4-random-characters}.tmp.exe
- %Temp%\{8-random-characters}.inf
- {Malware Directory}\Cyborg_DECRYPT.jpg
- %Desktop%\Cyborg_DECRYPT.txt
- %User Profile%\Music\Cyborg_DECRYPT.txt
- %User Profile%\Pictures\Cyborg_DECRYPT.txt
Step 8
Search and delete this folder
Step 9
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.MSIL.CYBORG.AA. 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 10
Restore encrypted files from backup.
Step 11
Scan your computer with your Trend Micro product to delete files detected as Ransom.MSIL.CYBORG.AA. 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:
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