Disclosure context

About Payloadbin

Payloadbin is a relatively obscure ransomware group that emerged in September 2021, primarily motivated by financial gain through extortion operations targeting diverse sectors across multiple countries. The group's origin and potential affiliations remain largely undocumented in public threat intelligence reporting, with limited information available regarding whether they operate as an independent entity or utilize a Ransomware-as-a-Service model. Based on observed victim patterns, Payloadbin has demonstrated a broad targeting approach without apparent sector specialization, though they have notably impacted healthcare, manufacturing, agriculture and food production, and telecommunications organizations across 48 documented cases. Their attack methodology and specific technical capabilities have not been extensively documented by major security research organizations, though their operational pattern suggests standard ransomware deployment tactics. The group has primarily targeted victims in the United States, Philippines, Australia, Mexico, and the United Kingdom, indicating either a broad opportunistic approach or potential linguistic capabilities spanning English-speaking regions and select international markets. No major high-profile campaigns, significant law enforcement disruptions, or notable ransomware payment records have been publicly attributed to this group by federal agencies or established threat intelligence firms. Current operational status remains unclear due to limited public documentation, though the group's relatively recent emergence and modest victim count suggests they may represent a smaller-scale operation compared to prominent ransomware families tracked by CISA and FBI reporting. The group has been linked to 48 public disclosures across our corpus. First observed on a leak site on September 9, 2021; most recent post March 26, 2026. The operation is currently active.

Timeline of this disclosure

March 26, 2026carlysle.net listed by Payloadbinon the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Not Found sector, which has 4,859 disclosures indexed across all operators we track. Geographically, carlysle.net is reported in United States, a country with 7,392 ransomware disclosures in our corpus.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.

Ransomware victim disclosure

← All victims

Carlysle Engineering, Inc.

listed as carlysle.net · Claimed by Payloadbin · listed 2 months ago

55d

Age

since listed · data leaked

Status timeline

Listed
Mar 26, 2026
Data leaked

At a glance

Group: Payloadbin
Status: Data leaked
Country: United States
Sector: Not Found
Listed on leak site: Mar 26, 2026

About the victim

AI dossier — public-source company profile

Carlysle Engineering, Inc. is an engineering firm based in Boston, Massachusetts. The company specializes in designing, installing, and maintaining fire protection systems such as sprinklers, and also provides building inspections and consulting services to ensure compliance with safety and insurance requirements.

Industry: Fire Protection Systems & Engineering
Address: Boston, Massachusetts, United States

Attack summary

Severity: medium — Data is listed as published (disclosed status: data_published), indicating confirmed exfiltration, but no details on the volume, sensitivity, or type of data exposed are provided, and no regulated or large-scale PII is confirmed.

The Payloadbin group claims to have attacked Carlysle Engineering, Inc. and has published data, though the specific nature of the exfiltrated data and whether encryption occurred is not detailed in the post.

medium

What the group claims

Carlysle.net belongs to Carlysle Engineering, Inc., an engineering firm based in Boston. The company specializes in designing, installing, and maintaining fire protection systems such as sprinklers. They also provide building inspections and consulting services to ensure compliance with safety and insurance requirements.

Sources

Victim sitecarlysle.net

Source

Indexed 2 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.