Ransomware Group: SINOBI

VICTIM NAME: J Derenzo

NOTE: No files or stolen information are [exfiltrated/downloaded/taken/hosted/seen/reposted/disclosed] by RedPacket Security. Any legal issues relating to the content of the files should be directed at the attackers directly, not RedPacket Security. This blog is simply posting an editorial news post informing that a company has fallen victim to a ransomware attack. RedPacket Security is in no way affiliated or aligned with any ransomware threat actors or groups and will not host infringing content. The information on this page is fully automated and redacted whilst being scraped directly from the SINOBI Onion Dark Web Tor Blog page.

AI Generated Summary of the Ransomware Leak Page

The leak page identifies J Derenzo Co. as the victim of a ransomware incident attributed to the Sinobi group. The U.S.-based construction contractor is described in the victim’s own background text as having a 75-year history in New England, with capabilities spanning large rural site clearing to intricate downtown Boston excavations. The post is dated August 13, 2025, and states that the victim’s systems were compromised and their data was encrypted. The page presents the word “Encrypted” alongside the figure 13800000 and a timestamp (13/08/2025 1432), which appear to reference data volume or exfiltration timing, though the exact meaning isn’t clarified. A claim URL is indicated on the page, signaling an extortion element and a channel for negotiation or ransom-related discussion. The leak page also includes five image attachments described as screenshots of internal documents, hosted on onion service addresses (defanged in this summary). The accompanying body excerpt reiterates the victim’s long-standing operations and emphasizes the firm’s broad site-work portfolio.

From a threat-intelligence perspective, the page aligns with a conventional ransomware pattern that pairs encryption with the potential for data exposure. The materials shown include five onion-hosted images intended as evidence of internal documents, suggesting data exfiltration alongside encryption. There is no explicit ransom amount stated in the available data, and no separate compromise date beyond the post date is evident in the provided content. The post date corresponds to the metadata key date, reinforcing that August 13, 2025, is the published timeline. The presence of a claim URL and multiple attachments is typical of double-extortion campaigns, where actors threaten to publish or release stolen data if negotiations fail.

Defensive note: organizations in the Construction sector should ensure robust backups, network segmentation, and monitoring for encryption events. While the exact ransom requirement isn’t disclosed in the provided material, the inclusion of five evidence images and a claim URL underscores the need for vigilant monitoring of extortion activity and rapid incident response planning in similar risk scenarios. The leak’s formal narrative focuses on J Derenzo Co.’s historical market presence, without introducing new personal identifiers beyond the victim organization’s name, and the image attachments are referenced without exposing their contents here.