# Krybit ransomware claims Brazilian domain schultz.com.br

Published: 2026-06-05 · Severity: high · Sectors: technology
Canonical: https://vorant.io/reports/30a7d1ed-ae0a-5ed5-8438-0824a353346a/krybit-ransomware-claims-brazilian-domain-schultz-com-br

> Krybit ransomware operators report compromising schultz.com.br with 181 affected users and exposed credentials.

Krybit ransomware operators have publicly listed schultz.com.br as a compromised victim on ransomware.live. According to the posting, the compromise affected 181 user accounts and exposed credentials for one third-party employee. The attacker also identified 63 items in the victim's external attack surface and retrieved DNS records from the domain. The Brazilian domain appears to be a legitimate business target, and the posting suggests the attackers conducted reconnaissance and credential harvesting as part of their intrusion chain.

## Mentioned in this report

- Threat actors: Krybit
- Malware: Krybit

## Detection guidance (public sample)

### Netsh Packet Capture Trace Started

ATT&CK: T1040

Detects netsh.exe starting a built-in packet capture trace (trace start capture=yes), which can be used to sniff network traffic and harvest credentials. 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: Netsh Packet Capture Trace Started
description: Detects netsh.exe starting a native packet capture trace (trace start
  capture=yes). Attackers can use this for network sniffing and credential harvesting
  without dropping extra tools. Matches the argument pattern, not file names or output
  paths.
tags:
- attack.discovery
- attack.credential-access
- attack.t1040
logsource:
  category: process_creation
  product: windows
detection:
  selection:
    Image|endswith: \netsh.exe
    CommandLine|contains|all:
    - trace
    - start
    - capture=yes
  condition: selection
falsepositives:
- Network or helpdesk staff troubleshooting connectivity with netsh trace
- Endpoint diagnostics tooling that invokes netsh trace during support sessions
level: medium
id: 89005a4d-5321-5f62-abb8-0d02276f1e1d
status: experimental
author: Vorant
references:
- https://www.ransomware.live/id/c2NodWx0ei5jb20uYnJAa3J5Yml0
```

### Packet Capture Tool Execution on Windows Host

ATT&CK: T1040

Detects execution of packet capture utilities (pktmon, tshark, dumpcap, windump) with capture-start arguments, indicating possible network sniffing for credentials. 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: Packet Capture Tool Execution on Windows Host
description: Detects packet capture utilities such as pktmon, tshark, dumpcap and
  windump being launched to capture traffic. Matches capture-start arguments to reduce
  noise from mere presence of the tools. Relevant to network sniffing for credential
  harvesting.
tags:
- attack.discovery
- attack.credential-access
- attack.t1040
logsource:
  category: process_creation
  product: windows
detection:
  selection_pktmon:
    Image|endswith: \pktmon.exe
    CommandLine|contains: start
  selection_tools:
    Image|endswith:
    - \tshark.exe
    - \dumpcap.exe
    - \windump.exe
    CommandLine|contains:
    - ' -i '
    - ' -w '
  condition: 1 of selection_*
falsepositives:
- Network engineers or SOC analysts running Wireshark/tshark for troubleshooting
- Authorized penetration tests or network forensics exercises
level: medium
id: 59994048-fa93-51de-905e-1c18012f3ccf
status: experimental
author: Vorant
references:
- https://www.ransomware.live/id/c2NodWx0ei5jb20uYnJAa3J5Yml0
```

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/c2NodWx0ei5jb20uYnJAa3J5Yml0

---

This is the free public brief from Vorant Threat Intelligence. When citing, attribute "Vorant" and link https://vorant.io/reports/30a7d1ed-ae0a-5ed5-8438-0824a353346a/krybit-ransomware-claims-brazilian-domain-schultz-com-br.
In the app the same report carries its extracted indicators, its detections (Splunk SPL already written, plus Elastic and Microsoft KQL where they apply), live profiles of the actors and CVEs it names, and the vendor research on the same campaign. Slack alerts fire on the vendors, sectors and countries a reader follows. A new account starts with three days of all of it, no card: https://vorant.io/signup