Rancoz

MITRE ATT&CK does not currently catalogue Rancoz, 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: rancoz executes PowerShell scripts to spread payloads and manipulate system configurations on compromised hosts.

   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: rancoz leverages registry run keys to ensure malware execution upon system reboot for persistence.

   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: rancoz disables security tools like antivirus software and modifies system processes to evade detection.

   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. T1070.004 File Deletion Stealth

   What they do: rancoz deletes critical files and Volume Shadow Copies via command-line utilities to maximize impact and prevent recovery.

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

5. T1135 Network Share Discovery Discovery

   What they do: rancoz scans network shares using SMB tools to identify additional victims within the victim environment.

   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.

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

   What they do: rancoz moves laterally through SMB/Windows Admin Shares to infect additional machines in manufacturing networks.

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

7. T1486 Data Encrypted for Impact Impact

   What they do: rancoz encrypts victim files using custom ransomware binaries, targeting documents and engineering data across sectors.

   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.

8. T1490 Inhibit System Recovery Impact

   What they do: rancoz calls system recovery inhibitors like shutdown scripts to prevent backup restoration attempts.

   What that means: Adversaries may delete or remove built-in data and turn off services designed to aid in the recovery of a corrupted system to prevent recovery.

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

~~~ Hello! Your company has been hacked! ~~~

	

>>>> Your data are stolen and encrypted


>>>> What guarantees that we will not deceive you? 


	We are not a politically motivated group and we do not need anything other than your money. 

    

	If you pay, we will provide you the programs for decryption and we will delete your data. 

	Life is too short to be sad. Be not sad, money, it is only paper.

    

	If we do not give you decrypters, or we do not delete your data after payment, then nobody will pay us in the future. 

	Therefore to us our reputation is very important. We attack the companies worldwide and there is no dissatisfied victim after payment.


>>>> You need to contact us by email [email protected] and decrypt some files for free


>>>> The data will be published on TOR website if you do not pay the ransom

		

		Download and install TOR Browser https://www.torproject.org/

		

		Links for Tor Browser:

		http://ze677xuzard4lx4iul2yzf5ks4gqqzoulgj5u4n5n4bbbsxjbfr7eayd.onion

		

>>>> Your personal ID:


[snip]


>>>> Provide your personal ID in the email


>>>> Warning! Do not DELETE or MODIFY any files, it can lead to recovery problems!


>>>> Warning! If you do not pay the ransom we will attack your company repeatedly again!

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