Was Khoo and Company, Inc hit by ransomware?

Khoo and Company, Inc was listed by the Cicada3301 ransomware operation (Singapore), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the Cicada3301 ransomware group?

Cicada3301 is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the Khoo and Company, Inc breach?

Cicada3301 published data attributed to Khoo and Company, Inc. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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Khoo and Company, Inc

Claimed by Cicada3301 · listed 2 years ago

22m

Age

since listed · data leaked

Status timeline

ListedAug 31, 2024
Data leakeddate unknown

At a glance

Group: Cicada3301
Status: Data leaked
Country: Singapore
Listed on leak site: Aug 31, 2024

About the victim

AI dossier — public-source company profile

Khoo & Company, Inc. is an established accounting firm based in San Francisco specializing in domestic and international tax compliance, planning, and accounting services. The firm serves individual clients and businesses across the United States and globally, with a team of CPAs and tax professionals holding advanced degrees.

Industry: Accounting & Tax Services
Address: San Francisco, CA, USA

Attack summary

Severity: medium — Breach of an accounting/tax firm exposes sensitive financial and personal data of clients at scale, but no proof files are advertised and no explicit data inventory is claimed in the post.

Cicada3301 claims to have breached Khoo & Company, Inc. The group post does not explicitly state what data was exfiltrated or the nature of the attack (encryption vs. exfiltration).

medium

Data the group says was taken

AI dossier — extracted from the leak post

Client tax records
Accounting documents
Business transaction data
Personally identifiable information

What the group claims

We are a small but qualified and experienced team of professionals that work very closely together to ensure a focused, efficient, and personal approach to delivering our services. Our team members are qualified and trained both internally and externally in domestic and international taxation planning and compliance. Each holds an accounting degree, a CPA certification or is a candidate, and some have obtained or are pursuing a Master’s degree in Taxation. Our Principal Eng Kuan Khoo, CPA

Sources

Victim sitekhoocpa.com
Leak posthttp://cicadabv7vicyvgz5khl7v2x5yygcgow7ryy6yppwmxii4eoobdaztqd.onion/8sw2pl4o8jhwbbztvd1zoncf3cnf8bfm

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 Cicada3301

Cicada3301 is a recently emerged ransomware group that began operations in June 2024, primarily motivated by financial gain through extortion activities targeting organizations across multiple sectors. The group's origin and affiliations remain largely undocumented in public threat intelligence reporting, with limited information available regarding their operational structure or potential connections to other cybercriminal organizations. Based on observed targeting patterns, Cicada3301 has demonstrated a preference for attacking business services, technology, manufacturing, and financial sector organizations, with their operations concentrated primarily in English-speaking countries including the United States, United Kingdom, and Canada, as well as extending to Spain and Singapore. The group has successfully compromised approximately 75 known victims since their emergence, though specific details regarding their attack methodologies, initial access vectors, encryption techniques, and extortion tactics have not been extensively documented in publicly available threat intelligence reports from major cybersecurity firms or government agencies. Given the limited public documentation available from CISA, FBI, Mandiant, or other reputable security researchers, the group's current operational status, technical capabilities, and specific attack infrastructure remain largely uncharacterized in open-source intelligence reporting. As of the most recent observations, Cicada3301 appears to remain active in conducting ransomware operations, though comprehensive analysis of their tactics, techniques, and procedures awaits more detailed public reporting from established threat intelligence sources. The group has been linked to 75 public disclosures across our corpus. First observed on a leak site on June 20, 2024; most recent post September 4, 2025. The operation is currently inactive.

Timeline of this disclosure

August 31, 2024Khoo and Company, Inc listed by Cicada3301on the group's public leak site

Other recent disclosures by Cicada3301

Cicada3301 has been linked to 75 public victims on Darkfield. A sample of the most recent:

See the full Cicada3301 dossier →

Sector and geography

Geographically, Khoo and Company, Inc is reported in Singapore, a country with 76 ransomware disclosures in our corpus.

If your organisation is affected

A listing by Cicada3301 means Khoo and Company, Inc 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, SingCERT (Singapore), as required for your jurisdiction.
Monitor for the data appearing on Cicada3301'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.