MAR-10382254-1.v1 – C2 RAT

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Description

This CISA submission included one unique file. This file is a malicious loader that contains an embedded executable. This embedded executable is a Remote Access Tool (RAT) that provides a vast array of Command and Control (C2) capabilities. These C2 capabilities include the ability to remotely monitor a system's desktop, gain reverse shell access, exfiltrate data, and upload and execute additional payloads. The malware can also function as a proxy, allowing a remote operator to pivot to other systems.

For a downloadable copy of IOCs, see: MAR-10382254-1.v1.stix

Submitted Files (2)

6589a687e69a182e075f11805a755ac1fabbddae1636c6fea8e80e7414521349 (hmsvc.exe)

6e3840f11aa02f391edd7e3e65b214f1af128fa207b4feb7f69e438014a2206d (658_dump_64.exe)

IPs (1)

192.95.20.8

6589a687e69a182e075f11805a755ac1fabbddae1636c6fea8e80e7414521349

Tags

trojan

Details

Antivirus

YARA Rules

• rule CISA_10382580_03 : loader
  {
     meta:
         Author = "CISA Code & Media Analysis"
         Incident = "10382580"
         Date = "2022-05-02"
         Last_Modified = "20220602_1200"
         Actor = "n/a"
         Category = "Loader"
         Family = "n/a"
         Description = "Detects loader samples"
         MD5_1 = "3764a0f1762a294f662f3bf86bac776f"
         SHA256_1 = "f7f7b059b6a7dbd75b30b685b148025a0d4ceceab405e553ca28cacdeae43fab"
         MD5_2 = "21fa1a043460c14709ef425ce24da4fd"
         SHA256_2 = "66966ceae7e3a8aace6c27183067d861f9d7267aed30473a95168c3fe19f2c16"
         MD5_3 = "e9c2b8bd1583baf3493824bf7b3ec51e"
         SHA256_3 = "7ea294d30903c0ab690bc02b64b20af0cfe66a168d4622e55dee4d6233783751"
         MD5_4 = "de0d57bdc10fee1e1e16e225788bb8de"
         SHA256_4 = "33b89b8915aaa59a3c9db23343e8c249b2db260b9b10e88593b6ff2fb5f71d2b"
         MD5_5 = "9b071311ecd1a72bfd715e34dbd1bd77"
         SHA256_5 = "3c2c835042a05f8d974d9b35b994bcf8d5a0ce19128ebb362804c2d0f3eb42c0"
         MD5_6 = "05d38bc82d362dd57190e3cb397f807d"
         SHA256_6 = "4cd7efdb1a7ac8c4387c515a7b1925931beb212b95c4f9d8b716dbe18f54624f"
     strings:
         $s0 = { B8 01 00 00 00 48 6B C0 00 C6 44 04 20 A8 B8 01 }
         $s1 = { 00 00 48 6B C0 01 C6 44 04 20 9A B8 01 00 00 }
         $s2 = { 48 6B C0 02 C6 44 04 20 93 B8 01 00 00 00 48 }
         $s3 = { C0 03 C6 44 04 20 9B B8 01 00 00 00 48 6B C0 }
     condition:
         all of them
  }

ssdeep Matches

No matches found.

PE Metadata

PE Sections

Relationships

Description

This malware is a 64-bit Windows loader that contains an encrypted malicious executable. During runtime, this encrypted executable is decrypted and loaded into memory, never touching the system's hard disk. The encrypted executable is similar in functionality to the file "f7_dump_64.exe" (88a5e4b24747648a4e3f0a2d5282b51683260f9208b06788fc858c44559da1e8), described in report MAR-10382580.

6e3840f11aa02f391edd7e3e65b214f1af128fa207b4feb7f69e438014a2206d

Tags

remote-access-trojantrojan

Details

Antivirus

YARA Rules

• rule CISA_10382580_01 : rat
  {
     meta:
         Author = "CISA Code & Media Analysis"
         Incident = "10382580"
         Date = "2022-05-25"
         Last_Modified = "20220602_1200"
         Actor = "n/a"
         Category = "Remote Access Tool"
         Family = "n/a"
         Description = "Detects Remote Access Tool samples"
         MD5_1 = "199a32712998c6d736a05b2dbd24a761"
         SHA256_1 = "88a5e4b24747648a4e3f0a2d5282b51683260f9208b06788fc858c44559da1e8"
     strings:
         $s0 = { 0F B6 40 0F 6B C8 47 41 0F B6 40 0B 02 D1 6B C8 }
         $s1 = { 35 41 0F B6 00 41 88 58 01 41 88 78 02 41 88 70 }
         $s2 = { 66 83 F8 1E }
         $s3 = { 66 83 F8 52 }
     condition:
         all of them
  }

ssdeep Matches

No matches found.

PE Metadata

PE Sections

Packers/Compilers/Cryptors

Description

This file is a 64-bit Windows executable that was extracted from the malware named hmsvc.exe, also included within this submission. Static analysis of this application reveals it is a RAT that provides a vast array of C2 capabilities to a remote operator, including the ability to log keystrokes, upload and execute additional payloads, function as a proxy, and have graphical user interface (GUI) access over a target Windows system's desktop. During runtime, the malware connects out to its hard coded C2 server 192[.]95[.]20[.]8 on port 443. After establishing this connection, the malware sits and waits for data to be sent back to it from the remote C2 server. Static analysis indicates the malware will receive a block of data that contains command data, and a 16-byte key. The 16-byte key will be extracted from this received data, and utilized to decrypt the command portion. The decrypted command portion of the C2 data will be checked to ensure that its first four bytes are equal to the value 0x0E03882Ah. If the values match, the malware will attempt to process the received decrypted data as a command. If the values do not match, the C2 session will be terminated and the malware will attempt to reinitiate a connection to the C2 server.

The executable is very similar in design and functionality to the file "f7_dump_64.exe" (88a5e4b24747648a4e3f0a2d5282b51683260f9208b06788fc858c44559da1e8), described in report MAR-10382580.

Screenshots

192.95.20.8

Tags

command-and-control

Ports

• 443 TCP

Whois

Queried whois.ovh.com with "ip-192-95-20.net"...

Domain Name: ip-192-95-20.net
Registry Domain ID: 1765585340_DOMAIN_NET-VRSN
Registrar WHOIS Server: whois.ovh.com
Registrar URL: https://www.ovh.com
Updated Date: 2021-12-01T02:56:46.0Z
Creation Date: 2012-12-11T13:59:05.0Z
Registrar Registration Expiration Date: 2022-12-11T13:59:05.0Z
Registrar: OVH, SAS
Registrar IANA ID: 433
Registrar Abuse Contact Email: abuse@ovh.net
Registrar Abuse Contact Phone: +33.972101007
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Registry Registrant ID:
Registrant Name: REDACTED FOR PRIVACY
Registrant Organization: Hebergement OVH Inc.
Registrant Street: REDACTED FOR PRIVACY
Registrant City: REDACTED FOR PRIVACY
Registrant State/Province:
Registrant Postal Code: REDACTED FOR PRIVACY
Registrant Country: CA
Registrant Phone: REDACTED FOR PRIVACY
Registrant Phone Ext: REDACTED FOR PRIVACY
Registrant Fax: REDACTED FOR PRIVACY
Registrant Fax Ext: REDACTED FOR PRIVACY
Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/
Registrant Email: 45oplxny9ljiuizg7k3l@w.o-w-o.info
Registry Admin ID:
Admin Name: REDACTED FOR PRIVACY
Admin Organization: REDACTED FOR PRIVACY
Admin Street: REDACTED FOR PRIVACY
Admin City: REDACTED FOR PRIVACY
Admin State/Province: REDACTED FOR PRIVACY
Admin Postal Code: REDACTED FOR PRIVACY
Admin Country: REDACTED FOR PRIVACY
Admin Phone: REDACTED FOR PRIVACY
Admin Phone Ext: REDACTED FOR PRIVACY
Admin Fax: REDACTED FOR PRIVACY
Admin Fax Ext: REDACTED FOR PRIVACY
Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/
Admin Email: t0xyeloj2uxkh9uyhhjh@y.o-w-o.info
Registry Tech ID:
Tech Name: REDACTED FOR PRIVACY
Tech Organization: REDACTED FOR PRIVACY
Tech Street: REDACTED FOR PRIVACY
Tech City: REDACTED FOR PRIVACY
Tech State/Province: REDACTED FOR PRIVACY
Tech Postal Code: REDACTED FOR PRIVACY
Tech Country: REDACTED FOR PRIVACY
Tech Phone: REDACTED FOR PRIVACY
Tech Phone Ext: REDACTED FOR PRIVACY
Tech Fax: REDACTED FOR PRIVACY
Tech Fax Ext: REDACTED FOR PRIVACY
Send message to contact by visiting https://www.ovhcloud.com/en/lp/request-ovhcloud-registered-domain/
Tech Email: t0xyeloj2uxkh9uyhhjh@y.o-w-o.info
Name Server: dns10.ovh.ca
Name Server: ns10.ovh.ca
DNSSEC: unsigned
URL of the ICANN WHOIS Data Problem Reporting System:
http://wdprs.internic.net/

Relationships

Description

The malware attempts to connect to this Internet Protocol (IP) address.

CISA recommends that users and administrators consider using the following best practices to strengthen the security posture of their organization's systems. Any configuration changes should be reviewed by system owners and administrators prior to implementation to avoid unwanted impacts.

• Maintain up-to-date antivirus signatures and engines.
• Keep operating system patches up-to-date.
• Disable File and Printer sharing services. If these services are required, use strong passwords or Active Directory authentication.
• Restrict users' ability (permissions) to install and run unwanted software applications. Do not add users to the local administrators group unless required.
• Enforce a strong password policy and implement regular password changes.
• Exercise caution when opening e-mail attachments even if the attachment is expected and the sender appears to be known.
• Enable a personal firewall on agency workstations, configured to deny unsolicited connection requests.
• Disable unnecessary services on agency workstations and servers.
• Scan for and remove suspicious e-mail attachments; ensure the scanned attachment is its "true file type" (i.e., the extension matches the file header).
• Monitor users' web browsing habits; restrict access to sites with unfavorable content.
• Exercise caution when using removable media (e.g., USB thumb drives, external drives, CDs, etc.).
• Scan all software downloaded from the Internet prior to executing.
• Maintain situational awareness of the latest threats and implement appropriate Access Control Lists (ACLs).

Additional information on malware incident prevention and handling can be found in National Institute of Standards and Technology (NIST) Special Publication 800-83, "Guide to Malware Incident Prevention & Handling for Desktops and Laptops".

• 1-888-282-0870
• CISA Service Desk (UNCLASS)
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• CISA IC (JWICS)

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What is a MIFR? A Malware Initial Findings Report (MIFR) is intended to provide organizations with malware analysis in a timely manner. In most instances this report will provide initial indicators for computer and network defense. To request additional analysis, please contact CISA and provide information regarding the level of desired analysis.

What is a MAR? A Malware Analysis Report (MAR) is intended to provide organizations with more detailed malware analysis acquired via manual reverse engineering. To request additional analysis, please contact CISA and provide information regarding the level of desired analysis.

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Can I submit malware to CISA? Malware samples can be submitted via three methods:

• Web: https://malware.us-cert.gov
• E-Mail: submit@malware.us-cert.gov
• FTP: ftp.malware.us-cert.gov (anonymous)

CISA encourages you to report any suspicious activity, including cybersecurity incidents, possible malicious code, software vulnerabilities, and phishing-related scams. Reporting forms can be found on CISA's homepage at www.cisa.gov.