General

  • Target

    https://github.com/enginestein/Virus-Collection/blob/main/Windows/Binaries/Ransomware/Krotten.exe

  • Sample

    240619-srnhcaxcrp

Malware Config

Extracted

Path

F:\$RECYCLE.BIN\S-1-5-21-3665033694-1447845302-680750983-1000\JDBZRIXWF-MANUAL.txt

Family

gandcrab

Ransom Note
---= GANDCRAB V5.2 =--- ***********************UNDER NO CIRCUMSTANCES DO NOT DELETE THIS FILE, UNTIL ALL YOUR DATA IS RECOVERED*********************** *****FAILING TO DO SO, WILL RESULT IN YOUR SYSTEM CORRUPTION, IF THERE ARE DECRYPTION ERRORS***** Attention! All your files, documents, photos, databases and other important files are encrypted and have the extension: .JDBZRIXWF The only method of recovering files is to purchase an unique private key. Only we can give you this key and only we can recover your files. The server with your key is in a closed network TOR. You can get there by the following ways: ---------------------------------------------------------------------------------------- | 0. Download Tor browser - https://www.torproject.org/ | 1. Install Tor browser | 2. Open Tor Browser | 3. Open link in TOR browser: http://gandcrabmfe6mnef.onion/9afdf213bd7f960e | 4. Follow the instructions on this page ---------------------------------------------------------------------------------------- On our page you will see instructions on payment and get the opportunity to decrypt 1 file for free. ATTENTION! IN ORDER TO PREVENT DATA DAMAGE: * DO NOT MODIFY ENCRYPTED FILES * DO NOT CHANGE DATA BELOW ---BEGIN GANDCRAB KEY--- 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 ---END GANDCRAB KEY--- ---BEGIN PC DATA--- 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 ---END PC DATA---
URLs

http://gandcrabmfe6mnef.onion/9afdf213bd7f960e

Extracted

Path

C:\g6QpgrhJDdQZeF0\DECRYPT_YOUR_FILES.HTML

Ransom Note
<html> <head> <style> body{ background-color: #3366CC; } h1 { background-color: RGB(249, 201, 16); } p { background-color: maroon; color: white; } </style> </head> <body> <center> <h1><b> Attention ! All your files </b> have been encrypted. </h1></br> <p> Due encrypting was used algoritm RSA-4096 and AES-256, used for protection military secrets.</br> That means > RESTORE YOU DATA POSIBLE ONLY BUYING decryption passwords from us.</br> Getting a decryption of your files is - SIMPLY task.</br></br> That all what you need:</br> 1. Sent Your ID_KEY on mailbox [email protected] or [email protected] </br> 2. For test, decrypt 2 small files, to be sure that we can decrypt you files.</br> 3. Pay our services. </br> 4. GET software with passwords for decrypt you files.</br> 5. Make measures to prevent this type situations again.</br></br> IMPORTANT(1)</br> Do not try restore files without our help, this is useless, and can destroy you data permanetly.</br></br> IMPORTANT(2) </br> We Cant hold you decryption passwords forever. </br>ALL DECRYPTION PASSWORDS, for what wasn`t we receive reward, will destroy after week of moment of encryption. </p> <p> Your ID_KEY: <br> </p> <table width="1024" border="0"> <tbody> <tr> <td><p>SS8r4DOEUaY9nXSXjtM5v8WihRQzm5RgFZVZbw+BS1W1WLNTRZAa3aTWocYhVUy0436b0HUN+Dj8BjGgAkJExFAP68M98EAItMZI3HPA1frZvNWXAmKBImX96RZ2P0FLgp4y9K8j6vNkYMHm/Jb3w8YWdG0RP1cepCw9MYH4EQZUYhrstoCplHE0QOedZ1i95htuUJapRTEagPAZhr5eHW1VIok+BZKv2+HoGWr+n7Z9jIYcmDl4p/ERS99nQweX0AnCtIBAy9iWNGyaDGa6fMylM0SfC4TjifhMLljJHlALgUyDmOXC9KLWIY2fUI4Qy6p3ju0RZlbjRcOZUdwnpQ==ZW4tVVM=</p></td> </tr> </tbody> </table> </center></html></body>

Extracted

Path

C:\g6QpgrhJDdQZeF0\DECRYPT_YOUR_FILES.HTML

Ransom Note
<html> <head> <style> body{ background-color: #3366CC; } h1 { background-color: RGB(249, 201, 16); } p { background-color: maroon; color: white; } </style> </head> <body> <center> <h1><b> Attention ! All your files </b> have been encrypted. </h1></br> <p> Due encrypting was used algoritm RSA-4096 and AES-256, used for protection military secrets.</br> That means > RESTORE YOU DATA POSIBLE ONLY BUYING decryption passwords from us.</br> Getting a decryption of your files is - SIMPLY task.</br></br> That all what you need:</br> 1. Sent Your ID_KEY on mailbox [email protected] or [email protected] </br> 2. For test, decrypt 2 small files, to be sure that we can decrypt you files.</br> 3. Pay our services. </br> 4. GET software with passwords for decrypt you files.</br> 5. Make measures to prevent this type situations again.</br></br> IMPORTANT(1)</br> Do not try restore files without our help, this is useless, and can destroy you data permanetly.</br></br> IMPORTANT(2) </br> We Cant hold you decryption passwords forever. </br>ALL DECRYPTION PASSWORDS, for what wasn`t we receive reward, will destroy after week of moment of encryption. </p> <p> Your ID_KEY: <br> </p> <table width="1024" border="0"> <tbody> <tr> <td><p>LAMOIlRaQqhmK9bluELGLRGB2qa2os1HdTldT74JMAn4LG/b++HLYimRQngxgFQo6d/y7RcAazwcmBk1jjvOpRAGVxp0ooOmxtmPTJ4yJOgzES9ORxhUNzX1hrasYoTWNBXl0zq358dj+d8KB2KdzjoazEykNLqK9IMKI2qwXHgju79UZ/MmJNt96wjeKej9PyGfo23er002jQSfJhFMcufCES12dppWJGmwwZ/LRp/Dx3MUae5h1LPoyxzADp7jpRrHenvHfqzrbf50j3yEyUiE0iu+BwSuBtb4RrVHLvmRtJL1qDML5fen8rGTwCp3yFPIFDdO6EsC1mgOpwTESg==ZW4tVVM=</p></td> </tr> </tbody> </table> </center></html></body>

Extracted

Path

C:\g6QpgrhJDdQZeF0\DECRYPT_YOUR_FILES.HTML

Ransom Note
<html> <head> <style> body{ background-color: #3366CC; } h1 { background-color: RGB(249, 201, 16); } p { background-color: maroon; color: white; } </style> </head> <body> <center> <h1><b> Attention ! All your files </b> have been encrypted. </h1></br> <p> Due encrypting was used algoritm RSA-4096 and AES-256, used for protection military secrets.</br> That means > RESTORE YOU DATA POSIBLE ONLY BUYING decryption passwords from us.</br> Getting a decryption of your files is - SIMPLY task.</br></br> That all what you need:</br> 1. Sent Your ID_KEY on mailbox [email protected] or [email protected] </br> 2. For test, decrypt 2 small files, to be sure that we can decrypt you files.</br> 3. Pay our services. </br> 4. GET software with passwords for decrypt you files.</br> 5. Make measures to prevent this type situations again.</br></br> IMPORTANT(1)</br> Do not try restore files without our help, this is useless, and can destroy you data permanetly.</br></br> IMPORTANT(2) </br> We Cant hold you decryption passwords forever. </br>ALL DECRYPTION PASSWORDS, for what wasn`t we receive reward, will destroy after week of moment of encryption. </p> <p> Your ID_KEY: <br> </p> <table width="1024" border="0"> <tbody> <tr> <td><p>ljgXhBW1Yqb3INJJ9OMM1my9jOWXKJIfPPaSiG6UbGamqyPlSjb1f3xuDxh2XnPeDzFmrh+/Q95VOpx7ise+vpJpBOmNkSfsNuD7E013kKV8lkqhHiDDnLUazNjSbI11Y9uRTcCBmJgrFukphpX3ZQ7GmbKa5QHDG9ONgcsHVTQ+mJyfagpC7uxW0nVk538CKtcKctQKd5cS8CqDH4PG0T6zis/26TweTimDvRgu27PhsWxX+RwHo11MUodYkdWErgWm1YnCF8Hmac5t/NWcP1ZBQg0DrrtvpCLBRB5FpDwijfTcmsQ7stWpWxclxj5tjfChY9G1cfYpLG6xJilPNg==ZW4tVVM=</p></td> </tr> </tbody> </table> </center></html></body>

Targets

    • Target

      https://github.com/enginestein/Virus-Collection/blob/main/Windows/Binaries/Ransomware/Krotten.exe

    • Fantom

      Ransomware which hides encryption process behind fake Windows Update screen.

    • Gandcrab

      Gandcrab is a Trojan horse that encrypts files on a computer.

    • Renames multiple (1008) files with added filename extension

      This suggests ransomware activity of encrypting all the files on the system.

    • Disables RegEdit via registry modification

    • Disables Task Manager via registry modification

    • Drops startup file

    • Executes dropped EXE

    • Adds Run key to start application

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Legitimate hosting services abused for malware hosting/C2

    • Sets desktop wallpaper using registry

MITRE ATT&CK Matrix ATT&CK v13

Persistence

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Defense Evasion

Modify Registry

4
T1112

Discovery

Query Registry

2
T1012

Peripheral Device Discovery

1
T1120

System Information Discovery

2
T1082

Command and Control

Web Service

1
T1102

Impact

Defacement

1
T1491

Tasks