Ransom_GANDCRAB.THAOAAAH

October 15, 2018

Analysis by: Maureen Reyes

ALIASES:

Ransom:Win32/Gandcrab!MTB (Microsoft), Trojan-Ransom.Win32.GandCrypt.fwa (Kaspersky), Ransom.GandCrab (Symantec)

PLATFORM:

Windows

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

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 drops files as ransom note.

TECHNICAL DETAILS

File Size: 434,176 bytes

File Type: EXE

Memory Resident: No

Initial Samples Received Date: 10 Oct 2018

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:

%User Temp%\pidor.bmp

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.)

It adds the following processes:

"C:\Windows\system32\wbem\wmic.exe" shadowcopy delete

Other System Modifications

This Ransomware adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\ex_data\
data

HKEY_LOCAL_MACHINE\SOFTWARE\keys_data\
data

HKEY_LOCAL_MACHINE\SOFTWARE\ex_data

HKEY_LOCAL_MACHINE\SOFTWARE\keys_data

It adds the following registry entries:

HKEY_LOCAL_,MACHINE\SOFTWARE\ex_data\
data
ext = "{Hex Data}"

HKEY_LOCAL_MACHINE\SOFTWARE\keys_data\
data
private = "{Hex Data}"

HKEY_LOCAL_MACHINE\SOFTWARE\keys_data\
data
public = "{Hex Data}"

It modifies the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%User Temp%\pidor.bmp"

Other Details

This Ransomware connects to the following possibly malicious URL:

http://aia.{BLOCKED}sl.com/certs/sub.class1.server.ca.crt
http://apps.{BLOCKED}ust.com/roots/dstrootcax3.p7c
http://{BLOCKED}ealer.com:443
http://{BLOCKED}uewiesen.com:443
http://crl.{BLOCKED}sl.com/crt1-crl.crl
http://{BLOCKED}hotel.com:443
http://g2.{BLOCKED}b.com/MEQwQjBAMD4wPDAJBgUrDgMCGgUABBSxtDkXkBa3l3lQEfFgudSiPNvt7gQUAPkqw0GRtsnCuD5V8sCXEROgByACAwI6cQ%3D%3D
http://gp.{BLOCKED}d.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBRH4mIoBb%2Bhjdi7K%2FE2J4ZS9L%2FZgAQUl8InUJ7CyewMiDLIfK3ipgFP2m8CEDzgLkOzTDeZMmnNb2%2Fb1wo%3D
http://{BLOCKED}golf.com:443
http://isrg.trustid.ocsp.{BLOCKED}ust.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBRv9GhNQxLSSGKBnMArPUcsHYovpgQUxKexpHsscfrb4UuQdf%2FEFWCFiRACEAoBQUIAAAFThXNqC4Xspwg%3D
http://{BLOCKED}egensberg.com/de/
http://{BLOCKED}alzermatt.ch:443
http://ocsp.{BLOCKED}ca.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBR64T7ooMQqLLQoy%2BemBUYZQOKh6QQUkK9qOpRaC9iQ6hJWc99DtDoo2ucCEDeF6CBtqHMHeIfLefRic9k%3D
http://ocsp.{BLOCKED}ca.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBR64T7ooMQqLLQoy%2BemBUYZQOKh6QQUkK9qOpRaC9iQ6hJWc99DtDoo2ucCEFAFq8ZQqnUCksBjrX9M0aQ%3D
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http://ocsp.int-x3.{BLOCKED}crypt.org/MFMwUTBPME0wSzAJBgUrDgMCGgUABBR%2B5mrncpqz%2FPiiIGRsFqEtYHEIXQQUqEpqYwR93brm0Tm3pkVl7%2FOo7KECEgM1ieMynE9OluUFxr4NJTuXUQ%3D%3D
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http://{BLOCKED}-ocsp.geotrust.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBTmZIMUEJUkjAe%2BEzHPoAFQD7Po3gQUxHnKjqFOAx0c3GvbMVuUPj8wfy0CEEGCEn0S2cazITlDElZkALg%3D
http://{BLOCKED}sprungzimmer24.com:443
http://status.{BLOCKED}sl.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBRJiUKgT2m88fZ4nxc1Lu6M%2FjvkagQUDNtsgkkPSmcKuBTuesRIUojrVjgCEAkKtiAbsdV0fBsjok%2BycGA%3D
http://status.{BLOCKED}sl.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBRhhZrQET0hvbSHUJmNfBKqR%2FiT7wQUU8oXWfxrwAMhLxqu5KqoHIJW2nUCEAUz4NRCjup5AMVJfVAVMDc%3D
http://status.{BLOCKED}sl.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBRhhZrQET0hvbSHUJmNfBKqR%2FiT7wQUU8oXWfxrwAMhLxqu5KqoHIJW2nUCEAiA31axzQJ8Sl3jmboFAyk%3D
http://status.{BLOCKED}sl.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBRhhZrQET0hvbSHUJmNfBKqR%2FiT7wQUU8oXWfxrwAMhLxqu5KqoHIJW2nUCEAsQ6gLRQWkT%2BLKxgqemuOk%3D
http://status.{BLOCKED}sl.com/MFEwTzBNMEswSTAJBgUrDgMCGgUABBRhhZrQET0hvbSHUJmNfBKqR%2FiT7wQUU8oXWfxrwAMhLxqu5KqoHIJW2nUCEAzpucldbpbOgWy7ZQ%2BMjE4%3D
http://www.{BLOCKED}e.com:443
http://www.{BLOCKED}rsport.biz:443
http://www.{BLOCKED}thotelbasel.com:443
http://www.{BLOCKED}tarium.org:443
http://www.{BLOCKED}odge.com:443
http://www.{BLOCKED}otelzurich.com:443
http://www.{BLOCKED}enthaus.com:443
http://www.{BLOCKED}e-hotel.com:443
http://www.{BLOCKED}e.com/includes/image/dekerues.gif
http://www.{BLOCKED}ecouronne.com:443
http://www.{BLOCKED}emontblanc.com:443
http://www.{BLOCKED}uewiesen.com:443
http://www.{BLOCKED}ere-locarno.com:443
http://www.{BLOCKED}us-toni.com:443
http://www.{BLOCKED}sel.com:443
http://www.{BLOCKED}iinfissi.com:443
http://www.{BLOCKED}acolline.com:443
http://www.{BLOCKED}t.com:443
http://www.{BLOCKED}l-adelboden.com:443
http://www.{BLOCKED}o.net:443
http://www.{BLOCKED}esurcoux.net:443
http://www.{BLOCKED}egas-avocats.net:443
http://www.{BLOCKED}e-d-hote-chez-fleury.com:443
http://www.{BLOCKED}ge.com:443
http://www.{BLOCKED}n.org:443
http://www.{BLOCKED}mehrmarken.net:443
http://www.{BLOCKED}biel.com:443
http://www.{BLOCKED}hotel.com:443
http://www.{BLOCKED}mentalchalet.com:443
http://www.{BLOCKED}.com:443
http://www.{BLOCKED}ht.net:443
http://www.{BLOCKED}gs-hotel.com/uploads/pictures/thsoamruzu.gif
http://www.{BLOCKED}gs-hotel.com:443
http://www.{BLOCKED}gs-hotels.com:443
http://www.{BLOCKED}ay.biz:443
http://www.{BLOCKED}-schwyn.mehrmarken.net:443
http://www.{BLOCKED}le.net:443
http://www.{BLOCKED}.frasershospitality.com:443
http://www.{BLOCKED}golf.com:443
http://www.{BLOCKED}elier.net:443
http://www.{BLOCKED}nau.biz:443
http://www.{BLOCKED}ckhoteldavos.
http://www.{BLOCKED}neva.com:443
http://www.{BLOCKED}ck.biz:443
http://www.{BLOCKED}blumental.com:443
http://www.{BLOCKED}hotel-zermatt.com:443
http://www.{BLOCKED}hotelalbanareal.com:443
http://www.{BLOCKED}hotelchery.com:443
http://www.{BLOCKED}hoteldreirosen.net:443
http://www.{BLOCKED}hotelfarinet.com:443
http://www.{BLOCKED}hotelgarni-battello.com:443
http://www.{BLOCKED}hotelglanis.com:443
http://www.{BLOCKED}hotellido-lugano.com:443
http://www.{BLOCKED}hotelnationalzermatt.ch:443
http://www.{BLOCKED}hotelolden.com:443
http://www.{BLOCKED}hotelrotonde.com:443
http://www.{BLOCKED}hoteltruite.com:443
http://www.{BLOCKED}hotelweisshorn.com:443
http://www.{BLOCKED}hrk-ramoz.com:443
http://www.{BLOCKED}huusgstaad.com:443
http://www.{BLOCKED}ibis.com:443
http://www.{BLOCKED}kreatifs.net:443
http://www.{BLOCKED}kroneregensberg.com:443
http://www.{BLOCKED}la-fontaine.com:443
http://www.{BLOCKED}lacommune.net:443
http://www.{BLOCKED}lassalle-haus.org:443
http://www.{BLOCKED}le-saint-hubert.com:443
http://www.{BLOCKED}lerichemond.com:443
http://www.{BLOCKED}limmathof.com:443
http://www.{BLOCKED}luganohoteladmiral.com:443
http://www.{BLOCKED}mercure.com:443
http://www.{BLOCKED}morcote-residenza.com:443
http://www.{BLOCKED}mountainhostel.com:443
http://www.{BLOCKED}nationalzermatt.ch:443
http://www.{BLOCKED}nationalzermatt.com:443
http://www.{BLOCKED}nett-coiffure.ch:443
http://www.{BLOCKED}neuhof.org:443
http://www.{BLOCKED}nh-hotels.com:443
http://www.{BLOCKED}osteriadelcentro.net:443
http://www.{BLOCKED}petit-paradis.com:443
http://www.{BLOCKED}pizcam.com:443
http://www.{BLOCKED}puurehuus.com:443
http://www.{BLOCKED}r-coiffure.net:443
http://www.{BLOCKED}relais-crosets.com:443
http://www.{BLOCKED}salon-coiffure-geneve.net:443
http://www.{BLOCKED}samnaunerhof.com:443
http://www.{BLOCKED}schwendelberg.com:443
http://www.{BLOCKED}seitensprungzimmer24.com:443
http://www.{BLOCKED}seminarhotel.com:443
http://www.{BLOCKED}stalden.com/index.cfm
http://www.{BLOCKED}stalden.com:443
http://www.{BLOCKED}staubbach.com:443
http://www.{BLOCKED}stchristophesa.com:443
http://www.{BLOCKED}swisswellness.com:443
http://www.{BLOCKED}torhotel.com:443
http://www.{BLOCKED}ueberland-garage.mehrmarken.net:443
http://www.{BLOCKED}vignobledore.com:443
http://www.{BLOCKED}vitatertia.org:443
http://www.{BLOCKED}von-arx.net:443
http://www.{BLOCKED}waageglarus.com:443
http://www.{BLOCKED}whitepod.com:443

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

.vffyiuyd

It drops the following file(s) as ransom note:

{Encrypted Directory}\VFFYIUYD-DECRYPT.txt

SOLUTION

Minimum Scan Engine: 9.850

FIRST VSAPI PATTERN FILE: 14.558.03

FIRST VSAPI PATTERN DATE: 11 Oct 2018

VSAPI OPR PATTERN File: 14.559.00

VSAPI OPR PATTERN Date: 12 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

Delete this registry key

[ Learn More ]

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
- ex_data
In HKEY_LOCAL_MACHINE\SOFTWARE
- keys_data

Step 4

Restore this modified registry value

[ Learn More ]

In HKEY_CURRENT_USER\Control Panel\Desktop
- From: Wallpaper = "%User Temp%\pidor.bmp"
  To: Wallpaper = "{User Preference}"

Step 5

Search and delete these files

[ Learn More ]

There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.

%User Temp%\pidor.bmp
{Encrypted Directory}\VFFYUIYD-DECRYPT.txt

Step 6

Scan your computer with your Trend Micro product to delete files detected as Ransom_GANDCRAB.THAOAAAH. 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:

Step 7

Restore encrypted files from backup.

NOTES:

Enabling Volume Shadow Service

Run the command prompt (cmd.exe) as administrator.
Enable Volume Shadow Service by typing the following command: net start vss

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Ransom_GANDCRAB.THAOAAAH

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