Unit 42 details a Russian cyberespionage campaign targeting Zimbra webmail servers using JavaScript injection to steal credentials. The post Russian Global Webmail Espionage appeared first on Unit 42 .
Turla has been using the backdoor against government and military organizations in Ukraine for espionage. The post Russian APT Deploys ‘StockStay’ Backdoor Against Ukrainian Targets appeared first on SecurityWeek .
A newly identified threat group, designated as GhostShell, has been conducting cyber operations against Ukraine's unmanned aerial vehicle supply chain since February 2026. The attackers employ malicious archives containing decoy documents that impersonate Besomar, a Ukrainian manufacturer of high-precision interceptor drones, to compromise defense and procurement networks. The attack chain deploys three distinct payloads: a custom backdoor (122.exe) utilizing mTLS client certificates for screen capture and command execution, an in-memory stager (update.exe) disguised as a Windows Health Service that fetches next-stage payloads via Telegram, and a proxy launcher (22.exe) that tunnels traffic through Xray Core to deploy the Vidar v2 information stealer. The targeting strongly suggests a Russian cyber operation, though analysts employ the SOLBIT framework to avoid attribution based on easily forgeable indicators.
This analysis examines Gamaredon's (UAC-0010, Armagedon) advanced espionage operations targeting Ukrainian government, military, and critical infrastructure. The FSB-operated group deploys GammaSteel, a sophisticated stealer operating almost entirely from memory using Windows DPAPI encryption and storing 71 distinct payload functions in the HKCU\Printers registry key. The malware employs three concurrent data acquisition mechanisms: timed drive scans, USB monitoring for air-gapped systems, and real-time file surveillance. Exfiltration occurs via legitimate S3-compatible cloud storage (Tebi.io) with fallback to operator-controlled servers. The infection chain extensively uses VBScript for evasion, Dead Drop Resolvers on platforms like Telegram and Mastodon for C2 configuration, and includes bidirectional backdoor capabilities enabling arbitrary remote code execution. Infrastructure demonstrates high automation with servers rotated approximately every 24 hours.
Gamaredon, an FSB-operated cyberespionage group, continues targeting Ukrainian government, military, and critical infrastructure through sophisticated multi-stage infection chains. This analysis examines GammaLoad, a collection of VBScript loaders that establish continuous access through three distinct stages. The malware leverages Dead Drop Resolvers on legitimate platforms including Telegram, Telegraph, and Check-Host to maintain persistent C2 communications while storing configurations in Windows registry keys. Each stage employs different techniques: the first fingerprints hosts and uses failover mechanisms, the second writes payloads to Alternate Data Streams and establishes persistence via scheduled tasks, and the third executes obfuscated PowerShell to deliver the final GammaSteel payload. This matryoshka architecture enables operators to deploy arbitrary payloads while remaining largely invisible by abusing trusted Windows features and cloud platforms.
A likely Russian threat cluster tracked as GreyVibe has been targeting Ukrainian entities with AI-generated lures and a rich set of custom malware tools. [...]
The initial vulnerability was exploited by Russia-linked APT28 in attacks against Ukraine and EU countries. The post Incomplete Windows Patch Opens Door to Zero-Click Attacks appeared first on SecurityWeek .
Attackers are leveraging the trusted reputation of Foxit PDF Reader, used by over 650 million people, to distribute malicious installers disguised as legitimate software. Rather than exploiting vulnerabilities, threat actors impersonate the vendor through fake installers with document-themed filenames that bypass user suspicion. When executed, these files display decoy passport images while downloading malicious MSI packages that deploy UltraVNC remote access tools disguised as GPU drivers. The attack establishes persistence through registry modifications and firewall exceptions, connecting to attacker-controlled infrastructure for complete remote system control. Telemetry indicates broad distribution across Germany, the United States, the United Kingdom, and Ukraine. This campaign demonstrates how brand impersonation combined with social engineering proves more effective than technical exploits, relying on user trust and behavioral patterns rather than software vulnerabilities.
GhostSocks is an emerging threat that turns compromised devices into residential proxy nodes, enabling attackers to evade detection. Originally marketed on Russian underground forums as Malware-as-a-Service, it has gained popularity due to its partnership with Lumma Stealer. Written in GoLang, GhostSocks uses SOCKS5 proxy protocol and TLS encryption to blend malicious traffic into normal network activity. It also incorporates backdoor functionality for running arbitrary commands and deploying additional payloads. Darktrace observed an increase in GhostSocks activity, detecting it alongside Lumma Stealer in customer networks. The malware's versatility in converting devices into proxy nodes while enabling covert network access illustrates how threat actors maximize the value of compromised infrastructure.
For the latest discoveries in cyber research for the week of 30th March, please download our Threat Intelligence Bulletin. TOP ATTACKS AND BREACHES Iranian state-affiliated threat group Handala Hack has breached FBI director’s Patel’s personal Gmail account and leaked many personal photos and documents. This follows the FBI’s seizure of domains related to Handala Hack’s […] The post 30th March – Threat Intelligence Report appeared first on Check Point Research .
The state-sponsored group’s campaign has targeted government, higher education, financial, and legal entities, as well as think tanks. The post Russian APT Star Blizzard Adopts DarkSword iOS Exploit Kit appeared first on SecurityWeek .
Ilya Angelov was a member of the cybercrime group tracked as TA-551, Shathak, Gold Cabin, Monster Libra, and ATK236. The post Russian Cybercriminal Gets 2-Year Prison Sentence in US appeared first on SecurityWeek .
The attacks included a destructive infiltration of Poland's energy system in December and was suspected of originating in Russia. The post Poland Faced a Surge in Cyberattacks in 2025, Including a Major Assault on the Energy Sector appeared first on SecurityWeek .
Insufficient sanitization of CSS content within HTML emails leads to inline script execution when the message is opened in a browser. The post Russian APT Exploits Zimbra Vulnerability Against Ukraine appeared first on SecurityWeek .
An exposed open directory revealed a comprehensive Roundcube exploitation toolkit used by APT28 to target Ukrainian government entities. The toolkit includes XSS payloads, a Flask-based C2 server, CSS injection tools, and a Go-based implant. It enables credential harvesting, persistent mail forwarding, bulk email exfiltration, address book theft, and 2FA secret extraction. The primary target was identified as mail.dmsu.gov.ua, Ukraine's State Migration Service. Technical analysis shows significant overlaps with previously documented APT28 operations, while introducing new capabilities such as CSS-based side-channel attacks and browser credential theft. The toolkit's modular approach and sophisticated evasion techniques demonstrate APT28's evolving tactics in compromising webmail platforms for long-term intelligence gathering.
A new campaign targeting Ukrainian entities has been identified, attributed to actors linked to Russia. The campaign uses judicial and charity-themed lures to deploy a JavaScript-based backdoor called DRILLAPP, which runs through the Edge browser. This backdoor enables various actions including file manipulation, microphone access, and webcam capture. Two variants of the campaign have been observed, with the second variant introducing additional capabilities. The attackers utilize the browser's capabilities to evade detection and gain access to sensitive resources. The campaign shares tactics with a previously reported Laundry Bear operation, leading to a low-confidence attribution to this group.
Operation CamelClone is a multi-region espionage campaign targeting government and defense entities in Algeria, Mongolia, Ukraine, and Kuwait. The attackers use spear-phishing emails with malicious ZIP archives containing lure documents and shortcuts. The infection chain involves a JavaScript loader called HOPPINGANT, which downloads additional payloads from public file-sharing websites. The campaign abuses legitimate tools like Rclone for data exfiltration to MEGA cloud storage. Targeting patterns suggest intelligence gathering objectives, focusing on foreign policy, defense capabilities, and diplomatic alignments of countries navigating major-power rivalries. The operation's use of public services for payload hosting and data exfiltration makes network-based detection challenging.
On Wednesday, a phishing message made its way into our handler inbox that contained a fairly typical low-quality lure, but turned out to be quite interesting in the end nonetheless. That is because the accompanying credential stealing web page was dynamically constructed using React and used a legitimate e-mail service for credential collection.
Google and iVerify analysis reveals a powerful exploit kit originally used by Russian state actors that is now appearing in broader criminal campaigns. The post Nation-State iOS Exploit Kit ‘Coruna’ Found Powering Global Attacks appeared first on SecurityWeek .
Other noteworthy stories that might have slipped under the radar: cyber valuations surge, OpenAI disrupts malicious AI use, ShinyHunters claims Odido breach. The post In Other News: ATT&CK Advisory Council, Russian Cyberattacks Aid Missile Strikes, Predator Bypasses iOS Indicators appeared first on SecurityWeek .
