# Qilin ransomware claims Thai Lion Air breach

Published: 2026-10-02 · Severity: high · Sectors: transportation, infrastructure
Canonical: https://vorant.io/reports/5631317c-c936-54ee-806d-c681eefd59d6/qilin-ransomware-claims-thai-lion-air-breach

> Qilin ransomware gang claims to have breached Thai Lion Air, reporting compromised employee credentials and external attack surface.

Qilin ransomware operators have publicly claimed a breach of Thai Lion Air, a Thai-based airline operator. According to the posting indexed on ransomware.live, the claimed compromise involved 75 compromised employees, 6,685 compromised user accounts, and 31 third-party employee credentials. The attackers also identified 129 external-facing systems across the victim's attack surface. This represents a typical ransomware gang disclosure: the threat actors claim data exfiltration and threaten publication or sale unless a ransom is paid. Thai Lion Air operates commercial aviation services and would fall within the transportation and critical infrastructure sectors. The disclosure follows the pattern of human-operated ransomware attacks that combine reconnaissance, lateral movement, data theft, and encryption threats.

## Mentioned in this report

- Threat actors: qilin
- Malware: Qilin

## Detection guidance (public sample)

### Privileged Account and Domain Group Enumeration via Net Commands

ATT&CK: T1087

Detects net.exe/net1.exe enumerating privileged domain groups or domain users, a common account discovery step in human-operated ransomware intrusions before data theft and encryption. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.

```yaml
title: Privileged Account and Domain Group Enumeration via Net Commands
description: Detects net.exe or net1.exe querying privileged domain groups (Domain
  Admins, Enterprise Admins, etc.) or listing domain users. This is account discovery
  typical of human-operated ransomware precursor activity. Matches the command pattern,
  not any campaign-specific artefact.
tags:
- attack.discovery
- attack.t1087.002
logsource:
  category: process_creation
  product: windows
detection:
  selection_img:
    Image|endswith:
    - \net.exe
    - \net1.exe
  selection_group:
    CommandLine|contains|all:
    - ' group '
    - /domain
  selection_user:
    CommandLine|contains|all:
    - ' user'
    - /domain
  selection_priv:
    CommandLine|contains:
    - domain admins
    - enterprise admins
    - schema admins
    - administrators
  condition: selection_img and ((selection_group and selection_priv) or selection_user)
falsepositives:
- Domain administrators or IT inventory scripts auditing privileged group membership
- Security assessment tooling run by authorised red or purple teams
level: medium
id: 84ad21c1-ec0c-5ad2-a25b-e96e8f86a418
status: experimental
author: Vorant
references:
- https://www.ransomware.live/id/VGhhaSBMaW9uIEFpckBxaWxpbg==
```

Behavioural rules are generated from public reporting — validate in your environment before deploying.

1 more detection for this report is in the app: the rules that match its indicators, the Sigma rules already converted to Splunk SPL, to Elastic where their fields map onto Elastic's integrations and to Microsoft Defender XDR KQL wherever Defender records the activity, and the YARA and Suricata. A new account gets three days of them free.

Source reporting: https://www.ransomware.live/id/VGhhaSBMaW9uIEFpckBxaWxpbg==

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