US-CERT- AA22-321A: #StopRansomware: Hive Ransomware

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AA22-321A: #StopRansomware: Hive Ransomware

[html]Original release date: November 17, 2022

Summary

Actions to Take Today to Mitigate Cyber Threats from Ransomware:



• Prioritize remediating https://www.cisa.gov/known-exploited-vulnerabilities-catalog">known exploited vulnerabilities.

• Enable and enforce multifactor authentication with strong passwords

• Close unused ports and remove any application not deemed necessary for day-to-day operations.

Note: This joint Cybersecurity Advisory (CSA) is part of an ongoing #StopRansomware effort to publish advisories for network defenders that detail various ransomware variants and ransomware threat actors. These #StopRansomware advisories include recently and historically observed tactics, techniques, and procedures (TTPs) and indicators of compromise (IOCs) to help organizations protect against ransomware. Visit https://www.cisa.gov/stopransomware">stopransomware.gov to see all #StopRansomware advisories and to learn more about other ransomware threats and no-cost resources.

The Federal Bureau of Investigation (FBI), the Cybersecurity and Infrastructure Security Agency (CISA), and the Department of Health and Human Services (HHS) are releasing this joint CSA to disseminate known Hive IOCs and TTPs identified through FBI investigations as recently as November 2022.

FBI, CISA, and HHS encourage organizations to implement the recommendations in the Mitigations section of this CSA to reduce the likelihood and impact of ransomware incidents. Victims of ransomware operations should report the incident to their local FBI field office or CISA.

Download the PDF version of this report: https://us-cert.cisa.gov/sites/default/files/publications/aa22-321a_joint_csa_stopransomware_hive.pdf">pdf, 852.9 kb.

Technical Details

Note: This advisory uses the MITRE ATT&CK® for Enterprise framework, version 12. See https://attack.mitre.org/versions/v12/matrices/enterprise/">MITRE ATT&CK for Enterprise for all referenced tactics and techniques.

As of November 2022, Hive ransomware actors have victimized over 1,300 companies worldwide, receiving approximately US$100 million in ransom payments, according to FBI information. Hive ransomware follows the ransomware-as-a-service (RaaS) model in which developers create, maintain, and update the malware, and affiliates conduct the ransomware attacks. From June 2021 through at least November 2022, threat actors have used Hive ransomware to target a wide range of businesses and critical infrastructure sectors, including Government Facilities, Communications, Critical Manufacturing, Information Technology, and especially Healthcare and Public Health (HPH).

The method of initial intrusion will depend on which affiliate targets the network. Hive actors have gained initial access to victim networks by using single factor logins via Remote Desktop Protocol (RDP), virtual private networks (VPNs), and other remote network connection protocols [https://attack.mitre.org/versions/v12/techniques/T1133/">T1133]. In some cases, Hive actors have bypassed multifactor authentication (MFA) and gained access to FortiOS servers by exploiting Common Vulnerabilities and Exposures (CVE) https://nvd.nist.gov/vuln/detail/CVE-2020-12812">CVE-2020-12812. This vulnerability enables a malicious cyber actor to log in without a prompt for the user's second authentication factor (FortiToken) when the actor changes the case of the username.

Hive actors have also gained initial access to victim networks by distributing phishing emails with malicious attachments [https://attack.mitre.org/versions/v12/techniques/T1566/001/">T1566.001] and by exploiting the following vulnerabilities against Microsoft Exchange servers [https://attack.mitre.org/versions/v12/techniques/T1190/">T1190]:

   
• https://nvd.nist.gov/vuln/detail/CVE-2021-31207">CVE-2021-31207 - Microsoft Exchange Server Security Feature Bypass Vulnerability

   
• https://nvd.nist.gov/vuln/detail/CVE-2021-34473">CVE-2021-34473 - Microsoft Exchange Server Remote Code Execution Vulnerability

   
• https://nvd.nist.gov/vuln/detail/CVE-2021-34523">CVE-2021-34523 - Microsoft Exchange Server Privilege Escalation Vulnerability

After gaining access, Hive ransomware attempts to evade detention by executing processes to:

   
• Identify processes related to backups, antivirus/anti-spyware, and file copying and then terminating those processes to facilitate file encryption [https://attack.mitre.org/versions/v12/techniques/T1562/001/">T1562].

   
• Stop the volume shadow copy services and remove all existing shadow copies via vssadmin on command line or via PowerShell [https://attack.mitre.org/versions/v12/techniques/T1059/">T1059] [https://attack.mitre.org/versions/v12/techniques/T1490/">T1490].

   
• Delete Windows event logs, specifically the System, Security and Application logs [https://attack.mitre.org/versions/v12/techniques/T1070/">T1070].

Prior to encryption, Hive ransomware removes virus definitions and disables all portions of Windows Defender and other common antivirus programs in the system registry [https://attack.mitre.org/versions/v12/techniques/T1112/">T1112].

Hive actors exfiltrate data likely using a combination of Rclone and the cloud storage service Mega.nz [https://attack.mitre.org/versions/v12/techniques/T1537/">T1537]. In addition to its capabilities against the Microsoft Windows operating system, Hive ransomware has known variants for Linux, VMware ESXi, and FreeBSD.

During the encryption process, a file named *.key (previously *.key.*) is created in the root directory (C:\ or /root/). Required for decryption, this key file only exists on the machine where it was created and cannot be reproduced. The ransom note, HOW_TO_DECRYPT.txt is dropped into each affected directory and states the *.key file cannot be modified, renamed, or deleted, otherwise the encrypted files cannot be recovered [https://attack.mitre.org/versions/v12/techniques/T1486/">T1486]. The ransom note contains a "sales department" .onion link accessible through a TOR browser, enabling victim organizations to contact the actors through a live chat panel to discuss payment for their files. However, some victims reported receiving phone calls or emails from Hive actors directly to discuss payment.

The ransom note also threatens victims that a public disclosure or leak site accessible on the TOR site, "HiveLeaks", contains data exfiltrated from victim organizations who do not pay the ransom demand (see figure 1 below). Additionally, Hive actors have used anonymous file sharing sites to disclose exfiltrated data (see table 1 below).

https://us-cert.cisa.gov/sites/default/files/publications/How%20to%20Decrypt.png" width="548" />

 

   
   
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
   

Table 1: Anonymous File Sharing Sites Used to Disclose Data

https://anonfiles[.]com

https://mega[.]nz

https://send.exploit[.]in

https://ufile[.]io

https://www.sendspace[.]com

https://privatlab[.]net

https://privatlab[.]com

 

Once the victim organization contacts Hive actors on the live chat panel, Hive actors communicate the ransom amount and the payment deadline. Hive actors negotiate ransom demands in U.S. dollars, with initial amounts ranging from several thousand to millions of dollars. Hive actors demand payment in Bitcoin.

Hive actors have been known to reinfect—with either Hive ransomware or another ransomware variant—the networks of victim organizations who have restored their network without making a ransom payment.

Indicators of Compromise

Threat actors have leveraged the following IOCs during Hive ransomware compromises. Note: Some of these indicators are legitimate applications that Hive threat actors used to aid in further malicious exploitation. FBI, CISA, and HHS recommend removing any application not deemed necessary for day-to-day operations. See tables 2–3 below for IOCs obtained from FBI threat response investigations as recently as November 2022.

   
   
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
      
         
      
   

Table 2: Known IOCs as of November 2022

Known IOCs - Files

HOW_TO_DECRYPT.txt typically in directories with encrypted files

*.key typically in the root directory, i.e., C:\ or /root

hive.bat

shadow.bat

asq.r77vh0[.]pw - Server hosted malicious HTA file

asq.d6shiiwz[.]pw - Server referenced in malicious regsvr32 execution

asq.swhw71un[.]pw - Server hosted malicious HTA file

asd.s7610rir[.]pw - Server hosted malicious HTA file

Windows_x64_encrypt.dll

Windows_x64_encrypt.exe

Windows_x32_encrypt.dll

Windows_x32_encrypt.exe

Linux_encrypt

Esxi_encrypt

Known IOCs – Events

System, Security and Application Windows event logs wiped

Microsoft Windows Defender AntiSpyware Protection disabled

Microsoft Windows Defender AntiVirus Protection disabled

Volume shadow copies deleted

Normal boot process prevented

Known IOCs – Logged Processes

wevtutil.exe cl system

wevtutil.exe cl security

wevtutil.exe cl application

vssadmin.exe delete shadows /all /quiet

wmic.exe SHADOWCOPY /nointeractive

wmic.exe shadowcopy delete

bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures

bcdedit.exe /set {default} recoveryenabled no

 

   
   
   
      
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
      
         
         
      
   

Table 3: Potential IOC IP Addresses as of November 2022

Note: Some of these observed IP addresses are more than a year old. FBI and CISA recommend vetting or investigating these IP addresses prior to taking forward-looking action like blocking.

Potential IOC IP Addresses for Compromise or Exfil:
84.32.188[.]57	84.32.188[.]238
93.115.26[.]251	185.8.105[.]67
181.231.81[.]239	185.8.105[.]112
186.111.136[.]37	192.53.123[.]202
158.69.36[.]149	46.166.161[.]123
108.62.118[.]190	46.166.161[.]93
185.247.71[.]106	46.166.162[.]125
5.61.37[.]207	46.166.162[.]96
185.8.105[.]103	46.166.169[.]34
5.199.162[.]220	93.115.25[.]139
5.199.162[.]229	93.115.27[.]148
89.147.109[.]208	83.97.20[.]81
5.61.37[.]207	5.199.162[.]220
5.199.162[.]229;	46.166.161[.]93
46.166.161[.]123;	46.166.162[.]96
46.166.162[.]125	46.166.169[.]34
83.97.20[.]81	84.32.188[.]238
84.32.188[.]57	89.147.109[.]208
93.115.25[.]139;	93.115.26[.]251
93.115.27[.]148	108.62.118[.]190
158.69.36[.]149/span>	181.231.81[.]239
185.8.105[.]67	185.8.105[.]103
185.8.105[.]112	185.247.71[.]106
186.111.136[.]37	192.53.123[.]202

 

MITRE ATT&CK TECHNIQUES

See table 4 for all referenced threat actor tactics and techniques listed in this advisory.

   
   
      
         
      
      
         
         
         
      
      
         
         
         
      
      
         
         
         
      
      
         
         
         
      
      
         
      
      
         
         
         
      
      
         
         
         
      
      
         
      
      
         
         
         
      
      
         
         
         
      
      
         
         
         
      
      
         
         
         
      
      
         
      
      
         
         
         
      
      
         
         
         

Table 4: Hive Actors ATT&CK Techniques for Enterprise

Initial Access
Technique Title	ID	Use
External Remote Services	https://attack.mitre.org/versions/v12/techniques/T1133/" style="color:#0563c1; text-decoration:underline">T1133	Hive actors gain access to victim networks by using single factor logins via RDP, VPN, and other remote network connection protocols.
Exploit Public-Facing Application	https://attack.mitre.org/versions/v12/techniques/T1190/" style="color:#0563c1; text-decoration:underline">T1190	Hive actors gain access to victim network by exploiting the following Microsoft Exchange vulnerabilities: CVE-2021-34473, CVE-2021-34523, CVE-2021-31207, CVE-2021-42321.
Phishing	https://attack.mitre.org/versions/v12/techniques/T1566/001/" style="color:#0563c1; text-decoration:underline">T1566.001	Hive actors gain access to victim networks by distributing phishing emails with malicious attachments.
Execution
Technique Title	ID	Use
Command and Scripting Interpreter	https://attack.mitre.org/versions/v12/techniques/T1059/" style="color:#0563c1; text-decoration:underline">T1059	Hive actors looks to stop the volume shadow copy services and remove all existing shadow copies via vssadmin on command line or PowerShell.
Defense Evasion
Technique Title	ID	Use
Indicator Removal on Host	https://attack.mitre.org/versions/v12/techniques/T1070/" style="color:#0563c1; text-decoration:underline">T1070	Hive actors delete Windows event logs, specifically, the System, Security and Application logs.
Modify Registry	https://attack.mitre.org/versions/v12/techniques/T1112/" style="color:#0563c1; text-decoration:underline">T1112	Hive actors set registry values for DisableAntiSpyware and DisableAntiVirus to 1.
Impair Defenses	https://attack.mitre.org/versions/v12/techniques/T1562/001/" style="color:#0563c1; text-decoration:underline">T1562	Hive actors seek processes related to backups, antivirus/anti-spyware, and file copying and terminates those processes to facilitate file encryption.
Exfiltration
Technique Title	ID	Use
Transfer Data to Cloud Account	https://attack.mitre.org/versions/v12/techniques/T1537/" style="color:#0563c1; text-decoration:underline">T1537	Hive actors exfiltrate data from victims, using a possible combination of Rclone and the cloud storage service Mega.nz< Let's not argue. Let's network! Print Go Up Pages1 User actions Networking-Forums.com Professional Discussions Vendor Advisories US-CERT- AA22-321A: #StopRansomware: Hive Ransomware User actions Print Help | Terms and Rules | Go Up ▲ SMF 2.1.4 © 2023, Simple Machines