Microsoft announced the release of open-source CodeQL queries that it experts used during its investigation into the SolarWinds supply-chain attack

In early 2021, the US agencies FBI, CISA, ODNI, and the NSA released a joint statement that blames Russia for the SolarWinds supply chain attack.

The four agencies were part of the task force Cyber Unified Coordination Group (UCG) that was tasked for coordinating the investigation and remediation of the SolarWinds hack that had a significant impact on federal government networks.

The UCG said the attack was orchestrated by an Advanced Persistent Threat (APT) actor, likely Russian in origin.

According to the security experts, Russia-linked threat actors hacked into the SolarWinds in 2019 used the Sundrop malware to insert the Sunburst backdoor into the supply chain of the SolarWinds Orion monitoring product.

Microsoft, which was hit by the attack, published continuous updates on its investigation, and now released the source code of CodeQL queries, which were used by its experts to identify indicators of compromise (IoCs) associated with Solorigate.

“In this blog, we’ll share our journey in reviewing our codebases, highlighting one specific technique: the use of CodeQL queries to analyze our source code at scale and rule out the presence of the code-level indicators of compromise (IoCs) and coding patterns associated with Solorigate.” reads the blog post published by Microsoft. “We are open sourcing the CodeQL queries that we used in this investigation so that other organizations may perform a similar analysis. Note that the queries we cover in this blog simply serve to home in on source code that shares similarities with the source in the Solorigate implant, either in the syntactic elements (names, literals, etc.) or in functionality.”

Microsoft releases open-source CodeQL queries to assess Solorigate compromise