Dutch Authorities Seize 800 Servers Linked to Stark Industries Infrastructure

This is a significant disruption, but I suspect it's temporary. These groups usually have backups. However, the immediate effect for us was a drop in outbound traffic anomalies on our edge firewalls. We saw a lot of long-lived connections dropping off earlier this week. I recommend checking your IDS alerts for 'Communication with C2' rules firing less frequently—it might mean the C2 is dead, not that you're clean.

Great catch on the KQL query. Just a note: if the Dutch authorities are sinkholing the traffic rather than just shutting it down, you might actually see increased or sustained connectivity from infected hosts as they try to phone home to the sinkhole. We noticed similar behavior during the Emotet takedown. Be careful not to assume a lack of traffic means a lack of infection.

From a pentester's perspective, this highlights the danger of relying on 'legitimate' hosting providers for infrastructure. It's getting harder to distinguish between standard VPS providers and those turning a blind eye to state-sponsored actors. Anyone using tools like Shodan or Censys to map out the remaining infrastructure shards of Stark Industries?

Don't overlook the potential 'panic' behavior in associated samples. When primary C2s go dark, certain implants initiate self-destruct routines or switch to DNS-over-HTTPS for fallback beaconing. If you're analyzing memory, hunt for sudden encryption of heap segments. For network analysis, try scanning PCAPs for high-frequency DNS queries. High entropy often signals DGA activation during failover:

import math
def check_entropy(s):
    p = [(s.count(c)/len(s)) for c in set(s)]
    return -sum([x*math.log(x) for x in p])

Solid point on the fallback behavior, Viktor. If they switch to DNS-over-HTTPS, you might see a spike in connections to common DoH resolvers. It’s worth hunting for unusual outbound connections on ports 443 or 853 that correlate with recent C2 communication attempts.

For those using Sentinel, here’s a basic query to spot high-volume DNS queries that might indicate beacons:

DnsEvents
| where TimeGenerated > ago(12h)
| summarize Count() by ClientIP, Name
| where Count > 50
| order by Count desc

To validate Nina's sinkhole theory, check the SSL/TLS fingerprints on those IPs. During seizures, LEAs often swap certificates to intercept traffic or let them expire. A sudden change in issuer or validity is a strong indicator. You can spot this manually using OpenSSL:

echo | openssl s_client -connect :443 2>/dev/null | openssl x509 -noout -issuer -dates

Compare the issuer against your historical logs to spot the switch.