Russian APT Group “BlueCharlie” Changes Infrastructure to Evade Detection

The Russian espionage group “BlueCharlie” has recently made significant changes to its infrastructure [1] [5], possibly in response to increased scrutiny [3]. This group [1] [2] [3] [4], believed to be affiliated with Russia’s Federal Security Service (FSB) [2] [3] [4], has been active since 2017 and is known for its sophisticated phishing campaigns [3].


BlueCharlie [1] [2] [3] [4] [5], also known as “Calisto,” “COLDRIVER,” “SEABORGIUM,” and “StarBlizzard,” has replaced its old infrastructure with 94 new domains starting in March 2023. This change is believed to be a response to public disclosures about the group’s activities. The group has targeted various organizations in government [1], defense [1], education [1], political sectors [1], as well as NGOs [1], think tanks [1], and journalists [1]. While primarily focused on espionage [1], BlueCharlie has also been involved in hack-and-leak operations and phishing campaigns aimed at credential theft. Their latest campaign involves creating new domains for credential harvesting and follow-on espionage attacks [1]. The group has shifted its naming pattern for domains [2] [4], now using keywords related to information technology and cryptocurrency [2] [4].

BlueCharlie’s evolving tactics demonstrate sophistication and a desire to evade detection [3]. There may be links between the group’s attack infrastructure and a Russian corporation [3], raising concerns about state-sponsored cyber attacks [3]. To counter the threats posed by BlueCharlie [3], organizations are advised to adopt phishing-resistant multi-factor authentication (MFA) [2] [3] [4], disable macros in Microsoft Office [3], and enforce frequent password resets [3] [4]. The proactive measures taken by BlueCharlie highlight the need for organizations to remain vigilant against evolving cyber threats [3].


The changes made by BlueCharlie to its infrastructure have significant implications for cybersecurity. The group’s ability to adapt and evolve its tactics demonstrates the need for organizations to practice general cyber hygiene and implement robust security measures. The use of phishing-resistant MFA, disabling macros in Microsoft Office [3], and frequent password resets are essential steps in mitigating the risks posed by BlueCharlie and similar threat actors. As cyber threats continue to evolve, organizations must remain vigilant and proactive in their defense strategies.