Monti

MITRE ATT&CK does not currently catalogue Monti, so this is our assessment of the techniques it uses, drawn from public reporting. The techniques themselves, and every "what that means" definition below, come from MITRE ATT&CK v19.2. Confidence: medium. Treat it as orientation, not attribution.

1. T1059.001 PowerShell Execution

   What they do: monti uses PowerShell to execute malicious payloads and spread ransomware across compromised systems.

   What that means: Adversaries may abuse PowerShell commands and scripts for execution.

2. T1547.001 Registry Run Keys / Startup Folder PersistencePrivilege Escalation

   What they do: monti modifies Registry Run Keys to establish persistence by executing ransomware on system startup.

   What that means: Adversaries may achieve persistence by adding a program to a startup folder or referencing it with a Registry run key.

3. T1685 Disable or Modify Tools Defense Impairment

   What they do: monti disables or modifies security tools like antivirus software to evade detection during ransomware deployment.

   What that means: Adversaries may disable, degrade, or tamper with security tools or applications (e.g., endpoint detection and response (EDR) tools, intrusion detection systems (IDS), antivirus, logging agents, sensors, etc.) to impair or reduce visibility of defensive capabilities.

4. T1027.016 Junk Code Insertion Stealth

   What they do: monti inserts junk code into binaries to evade static analysis and detection mechanisms.

   What that means: Adversaries may use junk code / dead code to obfuscate a malware’s functionality.

5. T1070.004 File Deletion Stealth

   What they do: monti deletes Volume Shadow Copies and backup files to prevent recovery without paying the ransom.

   What that means: Adversaries may delete files left behind by the actions of their intrusion activity.

6. T1003.001 LSASS Memory Credential Access

   What they do: monti accesses LSASS memory to steal credentials for persistence and privilege escalation.

   What that means: Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).

7. T1049 System Network Connections Discovery Discovery

   What they do: monti queries system network connections to identify active hosts and communication channels for exfiltration.

   What that means: Adversaries may attempt to get a listing of network connections to or from the compromised system they are currently accessing or from remote systems by querying for information over the network.

8. T1135 Network Share Discovery Discovery

   What they do: monti performs network share discovery to identify accessible file shares for lateral movement and data targeting.

   What that means: Adversaries may look for folders and drives shared on remote systems as a means of identifying sources of information to gather as a precursor for Collection and to identify potential systems of interest for Lateral Movement.

9. T1021.002 SMB/Windows Admin Shares Lateral Movement

   What they do: monti leverages SMB/Windows Admin Shares to move laterally within victim networks.

   What that means: Adversaries may use Valid Accounts to interact with a remote network share using Server Message Block (SMB).

10. T1486 Data Encrypted for Impact Impact

    What they do: monti encrypts victim files using strong encryption to achieve impact and demand ransom payments.

    What that means: Adversaries may encrypt data on target systems or on large numbers of systems in a network to interrupt availability to system and network resources.

Software Monti has been seen using, grouped by what it is used for. Legitimate administration tools appear here because these actors routinely abuse them — presence in this list is not itself malicious.

Tool data from Ransomware Tool Matrix by BushidoUK, licensed CC BY 4.0. Grouped by purpose and matched to this group by Breach House.

The note this group leaves on a compromised machine. Click a filename to read it.

All of your files are currently encrypted by BIDON strain. If you don't know who we are - just "Google it."

As you already know, all of your data has been encrypted by our software. 
It cannot be recovered by any means without contacting our team directly.

DON'T TRY TO RECOVER your data by yourselves. Any attempt to recover your data (including the usage of the additional recovery software) can damage your files. However,
if you want to try - we recommend choosing the data of the lowest value.

DON'T TRY TO IGNORE us. We've downloaded a pack of your internal data and are ready to publish it on our news website if you do not respond. 
So it will be better for both sides if you contact us as soon as possible.

DON'T TRY TO CONTACT feds or any recovery companies. 
We have our informants in these structures, so any of your complaints will be immediately directed to us. 
So if you will hire any recovery company for negotiations or send requests to the police/FBI/investigators, we will consider this as a hostile intent and initiate the publication of whole compromised data immediately.

To prove that we REALLY CAN get your data back - we offer you to decrypt two random files completely free of charge.

You can contact our team directly for further instructions through our website :

TOR VERSION :
(you should download and install TOR browser first https://torproject.org)

http://myosbja7hixkkjqihsjh6yvmqplz62gr3r4isctjjtu2vm5jg6hsv2ad.onion/chat/[snip]/

Also visit our blog (via Tor):
http://mblogci3rudehaagbryjznltdp33ojwzkq6hn2pckvjq33rycmzczpid.onion/

YOU SHOULD BE AWARE!
We will speak only with an authorized person. It can be the CEO, top management, etc. 
In case you are not such a person - DON'T CONTACT US! Your decisions and action can result in serious harm to your company! 
Inform your supervisors and stay calm!

All of your files are currently encrypted by MONTI strain. If you don't know who we are - just "Google it."

As you already know, all of your data has been encrypted by our software. 
It cannot be recovered by any means without contacting our team directly.

DON'T TRY TO RECOVER your data by yourselves. Any attempt to recover your data (including the usage of the additional recovery software) can damage your files. However,
if you want to try - we recommend choosing the data of the lowest value.

DON'T TRY TO IGNORE us. We've downloaded a pack of your internal data and are ready to publish it on our news website if you do not respond. 
So it will be better for both sides if you contact us as soon as possible.

DON'T TRY TO CONTACT feds or any recovery companies. 
We have our informants in these structures, so any of your complaints will be immediately directed to us. 
So if you will hire any recovery company for negotiations or send requests to the police/FBI/investigators, we will consider this as a hostile intent and initiate the publication of whole compromised data immediately.

To prove that we REALLY CAN get your data back - we offer you to decrypt two random files completely free of charge.

You can contact our team directly for further instructions through our website :

TOR VERSION :
(you should download and install TOR browser first https://torproject.org)

http://monti5o7lvyrpyk26lqofnfvajtyqruwatlfaazgm3zskt3xiktudwid.onion/chat/[snip]/

Our blog :
(also through TOR)

http://mblogci3rudehaagbryjznltdp33ojwzkq6hn2pckvjq33rycmzczpid.onion

YOU SHOULD BE AWARE!
We will speak only with an authorized person. It can be the CEO, top management, etc. 
In case you are not such a person - DON'T CONTACT US! Your decisions and action can result in serious harm to your company! 
Inform your supervisors and stay calm!

Ransom-note text from RansomLook, licensed CC BY 4.0.