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Silent Push’s research reveals the evolution of Raspberry Robin from a USB-based worm to an initial access broker (IAB) for Russian threat actors, including GRU’s Unit 29155. Key findings include:
– Discovery of 200+ unique C2 domains using nameserver patterns, domain conventions, and IP/ASN diversity.
– Collaboration with Team Cymru to map 2024 NetFlow data, exposing a centralized C2 infrastructure.
– Raspberry Robin now facilitates attacks by delivering secondary payloads (e.g., Cobalt Strike, IcedID) for ransomware groups.
You Should Know: Practical Defensive Measures
1. Detect Raspberry Robin C2 Traffic
Use Snort/Suricata rules to flag known C2 domains/IPs:
alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"Raspberry Robin C2 Traffic"; flow:established,to_server; content:"|0d 0a|User-Agent: Mozilla/5.0|0d 0a|"; sid:1000001; rev:1;)
#### **2. Block USB Auto-Run (Windows)**
Disable USB auto-execution via Group Policy:
Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\RemovableStorageDevices" -Name "Deny_Execute" -Value 1 -Type DWord
#### **3. Hunt for Persistence (Linux/Windows)**
Check **scheduled tasks** and **cron jobs**:
<h1>Linux</h1>
systemctl list-timers --all
crontab -l | grep -i "curl|wget"
<h1>Windows</h1>
Get-ScheduledTask | Where-Object { $_.Actions.Execute -match "powershell.exe" }
#### **4. Analyze Network Flows**
Use Zeek to log DNS queries to Raspberry Robin domains:
zeek -C -r traffic.pcap protocols/dns/dns-queries.log
#### **5. Memory Forensics (Volatility)**
Dump memory and search for malicious processes:
volatility -f memory.dump --profile=Win10x64_19041 pslist | grep -i "msiexec|rundll32"
### **What Undercode Say**
Raspberry Robin’s shift to IAB services underscores the convergence of cybercrime and nation-state tactics. Defenders must:
– Isolate USB devices in high-risk environments.
– Monitor DNS logs for anomalous .info/.top domains (common Raspberry Robin TLDs).
– Deploy endpoint detection (EDR) for living-off-the-land binary (LOLBin) abuse (e.g., msiexec.exe).
– Share threat intel via platforms like MISP to track C2 IPs.
Pro Tip: Use YARA rules to scan for Raspberry Robin payloads:
> “`bash
> rule RaspberryRobin_Worm {
> strings: $a = “HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Run\\raspberry”
> condition: $a }
> “`
### **Expected Output:**
- Snort/Suricata alerts for C2 traffic.
- Disabled USB auto-run via GPO.
- Zeek logs of suspicious DNS queries.
- Volatility memory analysis reports.
- YARA rule hits on disk/memory scans.
URLs:
References:
Reported By: Mthomasson Silent – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
