AR21-039A: MAR-10318845-1.v1 - SUNBURST
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Description
NotificationThis report is provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained herein. The DHS does not endorse any commercial product or service referenced in this bulletin or otherwise. This document is marked TLP:WHITE--Disclosure is not limited. Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction. For more information on the Traffic Light Protocol (TLP), see http://www.us-cert.gov/tlp. SummaryDescriptionThis report provides detailed analysis of several malicious artifacts associated with a sophisticated supply chain compromise of SolarWinds Orion network management software, identified by the security company FireEye as SUNBURST. For a downloadable copy of IOCs, see: MAR-10318845-1.v1.stix. Submitted Files (4)019085a76ba7126fff22770d71bd901c325fc68ac55aa743327984e89f4b0134 (SolarWinds.Orion.Core.Business...) 32519b85c0b422e4656de6e6c41878e95fd95026267daab4215ee59c107d6c77 (SolarWinds.Orion.Core.Business...) ce77d116a074dab7a22a0fd4f2c1ab475f16eec42e1ded3c0b0aa8211fe858d6 (SolarWinds.Orion.Core.Business...) d0d626deb3f9484e649294a8dfa814c5568f846d5aa02d4cdad5d041a29d5600 (SolarWinds-Core-v2019.4.5220-H...) Domains (1)avsvmcloud.com Findings32519b85c0b422e4656de6e6c41878e95fd95026267daab4215ee59c107d6c77Tagsbackdoorremote-access-trojantrojan Details
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ssdeep MatchesNo matches found. PE Metadata
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DescriptionThis file is a 32-bit .NET DLL named "SolarWinds.Orion.Core.BusinessLayer.dll." It is a modified SolarWinds-signed plugin component of the Orion software framework that has been patched with the SUNBURST backdoor. This malicious file was signed with a digital certificate issued by Symantec to SolarWinds. The digital certificate should be considered compromised. ScreenshotsFigure 1 - The modified module with a new class function named "OrionImprovementBusinessLayer." Figure 2 - The code snippet contains the subdomains and other strings used to construct the C2 domains. avsvmcloud.comTagscommand-and-control WhoisDomain Name: avsvmcloud.com Relationships
DescriptionThe subdomain for "SolarWinds.Orion.Core.BusinessLayer.dll." d0d626deb3f9484e649294a8dfa814c5568f846d5aa02d4cdad5d041a29d5600Tagsdropper Details
AntivirusNo matches found. YARA RulesNo matches found. ssdeep MatchesNo matches found. Relationships
DescriptionThis file is a Microsoft Windows Installer Patch file that has been identified as a SUNBURST installer named "SolarWinds-Core-v2019.4.5220-Hotfix5.msp." This file contains legitimate SolarWinds Orion update components, the modified DLL "SolarWinds.Orion.Core.BusinessLayer.dll" (32519b85c0b422e4656de6e6c41878e95fd95026267daab4215ee59c107d6c77) and a legitimate configuration file. ce77d116a074dab7a22a0fd4f2c1ab475f16eec42e1ded3c0b0aa8211fe858d6Tagsbackdoortrojan Details
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DescriptionThis file has been identified as a SolarWinds Application module containing a patched in SUNBURST backdoor. This embedded SUNBURST code contains the same functions as "SolarWinds.Orion.Core.BusinessLayer.dll" (32519b85c0b422e4656de6e6c41878e95fd95026267daab4215ee59c107d6c77), and is signed with the same digital certificate. 019085a76ba7126fff22770d71bd901c325fc68ac55aa743327984e89f4b0134Tagsbackdoortrojan Details
Antivirus
YARA Rules
ssdeep Matches
PE Metadata
PE Sections
DescriptionThis file has been identified as a SolarWinds Application module containing a patched in SUNBURST backdoor. This embedded SUNBURST code contains the same functions as "SolarWinds.Orion.Core.BusinessLayer.dll" (32519b85c0b422e4656de6e6c41878e95fd95026267daab4215ee59c107d6c77), and is signed with the same digital certificate. Relationship Summary
ConclusionPlease refer to the following resources for additional information and mitigation actions related to this campaign: RecommendationsCISA 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.
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". Contact Information
CISA continuously strives to improve its products and services. You can help by answering a very short series of questions about this product at the following URL: https://www.surveymonkey.com/r/G8STDRY Document FAQWhat 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. Can I edit this document? This document is not to be edited in any way by recipients. All comments or questions related to this document should be directed to the CISA at 1-888-282-0870 or CISA Service Desk. Can I submit malware to CISA? Malware samples can be submitted via three methods:
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. |
Revisions
- February 8, 2021: Initial Version
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