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Skender Construction

Claimed by Underground · listed 2 years ago

$318.3M
Ransom
demanded
26m
Age
since listed · data leaked

Status timeline

  1. ListedMay 1, 2024
  2. Data leakeddate unknown

At a glance

Group
Underground
Status
Data leaked
Country
United States
Sector
Business Services
Listed on leak site
May 1, 2024
Ransom demanded
$318.3M
Estimated revenue
$318.3M

About the victim

AI dossier — public-source company profile

Skender is a premier construction company operating across diverse markets including healthcare, education, affordable housing, hospitality, and industrial sectors. Based in Chicago with offices in Indianapolis, the firm specializes in collaborative construction delivery using Lean methodologies and advanced technologies.

Industry
Construction & Project Management
Address
Chicago, IL 60661 (headquarters); Indianapolis, IN (office)
Employees
501-1000

Attack summary

Severity: low — No proof files, screenshots, or sample data published. No confirmation of exfiltration or operational disruption. Post appears to be an announcement/listing only; revenue figure may be public knowledge.

The Underground group claims to have compromised Skender Construction. The post discloses the company's revenue ($318.3M) but provides no detail on data exfiltration, encryption scope, or specific data types accessed.

low

What the group claims

Revenue:$318.3 Million - Country :USA

Sources

Source

Indexed 2 years 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.

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Disclosure context

About Underground

Underground is a relatively new ransomware group that emerged in May 2024, primarily motivated by financial gain through extortion operations targeting organizations across multiple sectors. The group's origin and affiliations remain largely undocumented in public threat intelligence reporting, with no confirmed details about their country of origin or whether they operate as an independent entity or through a Ransomware-as-a-Service model. Based on the limited public information available, Underground has demonstrated a preference for targeting technology, healthcare, business services, manufacturing, and agriculture sectors, with their attacks concentrated primarily in the United States, Canada, South Korea, Germany, and Taiwan. The group's specific attack methodologies, initial access vectors, and technical capabilities have not been extensively documented in publicly available threat intelligence reports from major security firms or government agencies. With only 26 known victims since their emergence in May 2024, Underground represents a smaller-scale operation compared to established ransomware groups, though their cross-sector targeting approach indicates opportunistic victim selection rather than specialized industry focus. Given the recent emergence of this group and limited public reporting, Underground appears to remain active but operates at a relatively low profile compared to more established ransomware families. The group has been linked to 26 public disclosures across our corpus. First observed on a leak site on May 1, 2024; most recent post August 15, 2025. The operation is currently inactive.

Timeline of this disclosure

  • May 1, 2024Skender Construction listed by Undergroundon the group's public leak site
Ransom demanded
$318.3M

Other recent disclosures by Underground

Underground has been linked to 26 public victims on Darkfield. A sample of the most recent:

See the full Underground dossier →

Sector and geography

This disclosure adds to ransomware activity in the Business Services sector, which has 3,796 disclosures indexed across all operators we track. Geographically, Skender Construction is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Underground means Skender Construction appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

  • Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
  • Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
  • Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
  • Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
  • Monitor for the data appearing on Underground's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

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.