Qvl List Gigabyte
Andrew Schiavo
The script compares the motherboard model to the list of models known to be impacted. It also checks the Windows filesystem for the presence of the GigabyteUpdateService.exe executable and, if found, compares the SHA256 hash against the list of hashes seen by Eclypsium.
Recently, the Eclypsium platform began detecting suspected backdoor-like behavior within Gigabyte systems in the wild. These detections were driven by heuristic detection methods, which play an important role in detecting new, previously-unknown supply chain threats, where legitimate third-party technology products or updates have been compromised. Our follow-up analysis discovered that firmware in Gigabyte systems is dropping and executing a Windows native executable during the system startup process, and this executable then downloads and executes additional payloads insecurely. It uses the same techniques as other OEM backdoor-like features like Computrace backdoor (a.k.a. LoJack DoubleAgent) abused by threat actors and even firmware implants such as Sednit LoJax, MosaicRegressor, Vector-EDK. Subsequent analysis showed that this same code is present in hundreds of models of Gigabyte PCs. We are working with Gigabyte to address this insecure implementation of their app center capability.
In the interest of protecting organizations from malicious actors, we are also publicly disclosing this information and defensive strategies on a more accelerated timeline than a typical vulnerability disclosure. This backdoor appears to be implementing intentional functionality and would require a firmware update to completely remove it from affected systems. While our ongoing investigation has not confirmed exploitation by a specific threat actor, an active widespread backdoor that is difficult to remove poses a supply chain risk for organizations with Gigabyte systems. At a high level, the relevant attack vectors include:
Since many more issues like this continue to be discovered, Eclypsium is continuously running at-scale analysis of the information technology supply chain. Look for additional findings on this blog and the Eclypsium Platform for your organization.
It then sets registry entries to run this executable as a Windows Service. The mechanism described here is similar to the methods used by other UEFI firmware implants such as LoJax, MosiacRegressor, MoonBounce, and Vector-EDK, referenced previously.
Plain HTTP (the first bullet above) should never be used for updating privileged code as it is easily compromised via Machine-in-the-middle (MITM) attacks. However, we noticed that even when using the HTTPS-enabled options, remote server certificate validation is not implemented correctly. Therefore, MITM is possible in that case also.
The firmware does not implement any cryptographic digital signature verification or any other validation over the executables. The dropped executable and the normally-downloaded Gigabyte tools do have a Gigabyte cryptographic signature that satisfies the code signing requirements of Microsoft Windows, but this does little to offset malicious use, especially if exploited using Living-off-the-Land techniques (like in the recent alert regarding Volt Typhoon attackers). As a result, any threat actor can use this to persistently infect vulnerable systems either via MITM or compromised infrastructure.
Researchers at Eclypsium Labs are continuing to investigate for any signs of malicious activity related to this discovery. We will provide additional updates as new information becomes available. For more information or assistance contact Eclypsium at [email protected].
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*** For each object that is stored in the S3 Glacier Flexible Retrieval and S3 Glacier Deep Archive storage classes, AWS charges for 40 KB of for index and metadata, with 8 KB charged at S3 Standard rates and 32 KB charged at S3 Glacier Flexible Retrieval or S3 Deep Archive rates. This allows you to get a real-time list of all of your S3 objects using the S3 LIST API or the S3 Inventory report. S3 Glacier Instant Retrieval has a minimum billable object size of 128 KB. Smaller objects may be stored but will be charged for 128 KB of storage at the appropriate storage class rate. Objects that are archived to S3 Glacier Instant Retrieval and S3 Glacier Flexible Retrieval are charged for a minimum storage duration of 90 days, and S3 Glacier Deep Archive has a minimum storage duration of 180 days. Objects deleted prior to the minimum storage duration incur a pro-rated charge equal to the storage charge for the remaining days. Objects that are deleted, overwritten, or transitioned to a different storage class before the minimum storage duration will incur the normal storage usage charge plus a pro-rated storage charge for the remainder of the minimum storage duration. Objects stored longer than the minimum storage duration will not incur a minimum storage charge. For customers using the S3 Glacier direct API, pricing for API can be found on the S3 Glacier API pricing page.
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** S3 Standard-IA and S3 One Zone-IA storage are charged for a minimum storage duration of 30 days. Objects that are deleted, overwritten, or transitioned to a different storage class before the minimum storage duration will incur the normal storage usage charge plus a pro-rated charge for the remainder of the minimum storage duration. Objects stored longer than the minimum storage duration will not incur aminimum charge.
**** Objects that are archived to S3 Glacier Instant Retrieval and S3 Glacier Flexible Retrieval are charged for a minimum storage duration of 90 days, and S3 Glacier Deep Archive has a minimum storage duration of 180 days. Objects deleted prior to the minimum storage duration incur a pro-rated charge equal to the storage charge for the remaining days. Objects that are deleted, overwritten, or transitioned to a different storage class before the minimum storage duration will incur the normal storage usage charge plus a pro-rated charge for the remainder of the minimum storage duration. Objects stored longer than the minimum storage duration will not incur a minimum charge. S3Glacier Flexible Retrieval Bulk data retrievals and requests are free of charge.
***** Provisioned Capacity Units allow you to provision capacity for expedited retrievals from S3 Glacier for a given month. Each provisioned capacity unit can provide at least three expedited retrievals every five minutes and up to 150 MB/s of retrieval throughput.
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