Summary (Bottom Line Up Front)
An IP address from Düsseldorf, Germany (178.16.54.22) has been observed engaging in credential capture attempts and SMTP probing over a three-day period. The activity is assessed as noise but warrants attention due to the high volume of login attempts. Network defenders should implement or review their current defenses against such activities. ###
Activity Timeline
INITIAL REPORT2026-06-05T08:28:05Z
Source: Analyst Manual Entry
An IP address from Düsseldorf, Germany (178.16.54.22) has been observed engaging in credential capture attempts and SMTP probing over a three-day period. The activity is assessed as noise but warrants attention due to the high volume of login attempts. Network defenders should implement or review their current defenses against such activities.
Technical details
The IP address 178.16.54.22, associated with dus.net GmbH in Germany, has been involved in multiple credential capture and exploit attempts targeting open ports (135, 137, 445, 5985). The attacker also probed SMTP services for reconnaissance purposes. Notably, the activity includes high-volume login attempts indicative of potential brute-force attacks or credential harvesting. While AI analysis categorized this as noise with a low novelty score, the volume and nature of the attacks suggest ongoing interest in network exploitation.
IOCs
IP:178.16.54.22
ASN:40999
COUNTRY:NL
Recommendations
- Review and enhance authentication mechanisms to prevent unauthorized access.
- Implement strict rate limiting on services exposed to the internet (e.g., SMTP).
- Monitor for unusual login attempts and investigate any deviations from baseline activity.
- Deploy or update intrusion detection/prevention systems with rules targeting common exploit signatures.
- Educate users about phishing tactics and secure password practices.