Ransom.Win32.GANDCRAB.THOIBOAK
Trojan-Ransom.Win32.GandCrypt.exy (Kaspersky) , Troj/GandCrab-Z (Sophos AV) , Trojan:Win32/Occamy.C (Microsoft)
Windows
Threat Type: Ransomware
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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 deletes itself after execution.
It drops files as ransom note.
TECHNICAL DETAILS
172032 bytes
EXE
No
14 Sep 2018
Connects to URLs/IPs, Displays message/message boxes, Terminates processes, Steals information
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 mutexes to ensure that only one of its copies runs at any one time:
- Global\{Random Hex}.lock
Other System Modifications
This Ransomware adds the following registry entries:
HKEY_CURRENT_USER\SOFTWARE\keys_data\
data
private = {Key}
HKEY_CURRENT_USER\SOFTWARE\keys_data\
data
public = {Key}
Process Termination
This Ransomware terminates the following processes if found running in the affected system's memory:
- msftesql.exe
- sqlagent.exe
- sqlbrowser.exe
- sqlwriter.exe
- oracle.exe
- ocssd.exe
- dbsnmp.exe
- synctime.exe
- agntsvc.exeisqlplussvc.exe
- xfssvccon.exe
- sqlservr.exe
- mydesktopservice.exe
- ocautoupds.exe
- agntsvc.exeagntsvc.exe
- agntsvc.exeencsvc.exe
- firefoxconfig.exe
- tbirdconfig.exe
- mydesktopqos.exe
- ocomm.exe
- mysqld.exe
- mysqld-nt.exe
- mysqld-opt.exe
- dbeng50.exe
- sqbcoreservice.exe
- excel.exe
- infopath.exe
- msaccess.exe
- mspub.exe
- onenote.exe
- outlook.exe
- powerpnt.exe
- steam.exe
- sqlservr.exe
- thebat.exe
- thebat64.exe
- thunderbird.exe
- visio.exe
- winword.exe
Information Theft
This Ransomware gathers the following data:
- Username
- Computer Name
- Network
- System Language
- Machine Keyboard Layout
- OS Version and Platform
- AV products installed
- Processor
- IP Address
- Network and Local Drives information
- Ransom ID
- GandCrab Internal Info:
- id
- sub_id
- version
- action
Other Details
This Ransomware connects to the following website to send and receive information:
- http://{URL}/{string1}/{string2}/{string3}.{string4}
- Where URL is equal to the following:
- {BLOCKED}rno.com
- {BLOCKED}.{BLOCKED}.1.219
- {BLOCKED}.{BLOCKED}.113.170
- {BLOCKED}.{BLOCKED}.17.237
- {BLOCKED}.{BLOCKED}.96.238
- {BLOCKED}.{BLOCKED}.99.104
- {BLOCKED}.{BLOCKED}.17.9
- {BLOCKED}.{BLOCKED}.99.165
- {BLOCKED}questions.ru
- {BLOCKED}.{BLOCKED}.17.155
- {BLOCKED}.{BLOCKED}.187.178
- {BLOCKED}ngbrazil.com
- {BLOCKED}.{BLOCKED}.60.222
- {BLOCKED}flats.com
- {BLOCKED}.{BLOCKED}.241.0
- {BLOCKED}n.cn
- {BLOCKED}ndicraft.com
- {BLOCKED}ocarro.com.br
- {BLOCKED}t.fr
- {BLOCKED}ultibrasil.com.br
- {BLOCKED}.io
- {BLOCKED}tessa.com
- {BLOCKED}veis.imb.br
- {BLOCKED}ampustaksi.com.tr
- {BLOCKED}sna.com.ua
- {BLOCKED}.com
- {BLOCKED}kpick.com
- {BLOCKED}selamatankerja.co
- {BLOCKED}intakeaway.com
- {BLOCKED}ayrimenkul.com
- {BLOCKED}analuxe.lviv.ua
- {BLOCKED}m.be
- {BLOCKED}afas.org
- {BLOCKED}rdin.com
- {BLOCKED}tsouverts.org
- {BLOCKED}nas.kiev.ua
- {BLOCKED}ontractors.com.au
- {BLOCKED}.mx
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- {BLOCKED}urk.club
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- {BLOCKED}stay.com
- {BLOCKED}inhduong.com
- {BLOCKED}me.ru
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- {BLOCKED}aevents.com
- {BLOCKED}latpars.ir
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- {BLOCKED}anbmdrdpayqtg1d7h.xn--p1ai
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- {BLOCKED}phage_pedik.com
- {BLOCKED}m.ovh
- Where string1 is equal to the following:
- wp-content
- static
- content
- includes
- data
- uploads
- news
- Where string2 is equal to the following:
- images
- pictures
- image
- graphic
- assets
- pics
- imgs
- tmp
- Where string3 is equal to the combination of the following:
- im
- de
- ka
- ke
- am
- es
- so
- fu
- se
- da
- he
- ru
- me
- mo
- th
- zu
- Where string4 is equal to the following:
- jpg
- png
- gif
- bmp
It does the following:
- Avoids encrypting files with the following extensions:
- .ani
- .cab
- .cpl
- .cur
- .diagcab
- .diagpkg
- .dll
- .drv
- .lock
- .hlp
- .ldf
- .icl
- .icns
- .ico
- .ics
- .lnk
- .key
- .idx
- .mod
- .mpa
- .msc
- .msp
- .msstyles
- .msu
- .nomedia
- .ocx
- .prf
- .rom
- .rtp
- .scr
- .shs
- .spl
- .sys
- .theme
- .themepack
- .exe
- .bat
- .cmd
- .gandcrab
- .KRAB
- .CRAB
- .zerophage_i_like_your_pictures
- delete shadow copies
- It checks for the presence of the following antivirus and security applications:
- AVP.EXE
- ekrn.exe
- avgnt.exe
- ashDisp.exe
- NortonAntiBot.exe
- Mcshield.exe
- avengine.exe
- cmdagent.exe
- smc.exe
- persfw.exe
- pccpfw.exe
- fsguiexe.exe
- cfp.exe
- msmpeng.exe
- The malware does not proceed to its encryption routine if it detects a Russian keyboard layout.
It deletes itself after execution.
Ransomware Routine
This Ransomware avoids encrypting files with the following strings in their file name:
- desktop.ini
- autorun.inf
- ntuser.dat
- iconcache.db
- bootsect.bak
- boot.ini
- ntuser.dat.log
- Thumbs.db
- KRAB-DECRYPT.html
- KRAB-DECRYPT.txt
- CRAB-DECRYPT.txt
- ntldr
- NTDETECT.COM
- Bootfont.bin
It avoids encrypting files found in the following folders:
- ProgramData
- IETldCache
- Boot
- Program Files
- Tor Browser
- All Users
- Local Settings
- Windows
- %Windows%
- %AppDataLocal%
- %Program Files%\Common Files
- %Program Files%
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista, 7, and 8.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), 7 (32-bit), and 8 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), 7 (64-bit), and 8 (64-bit).)
It appends the following extension to the file name of the encrypted files:
- .KRAB
It drops the following file(s) as ransom note:
- {Encrypted Directory}\KRAB-DECRYPT.txt
SOLUTION
9.850
14.552.04
08 Oct 2018
14.553.00
09 Oct 2018
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_CURRENT_USER\SOFTWARE\keys_data\data
- private = {Key}
- private = {Key}
- In HKEY_CURRENT_USER\SOFTWARE\keys_data\data
- public = {Key}
- public = {Key}
Step 5
Search and delete these files
- {Encrypted Folder}\KRAB-DECRYPT.txt
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win32.GANDCRAB.THOIBOAK. 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 7
Restore encrypted files from backup.
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