Sample Incident: Argous Corporation

Sample Incident: Argous Corporation

Is the Argous Corporation scenario one actual incident?

No. It is a fictional case combining elements of real incidents.

What industry does Argous Corporation operate in?

Specialized computer-chip engineering.

Which sectors use Argous's specialized computer chips?

Government, military, and private business.

What is the name of the attacker group in the Argous case?

Green Penguin.

How is Green Penguin linked to a nation-state?

It acts as a contractor for nation-state operations.

Why would a nation-state use contractor attackers?

To complicate attribution to the sponsor.

What does the Argous case primarily demonstrate?

How an incident can expand beyond its first visible symptom.

What publicly accessible business application did Argous use?

A custom Customer Relationship Management (CRM) web application.

Which key infrastructure systems did Argous operate?

A domain controller, file server, and database server.

How many user workstations were on the Argous network?

About 100.

When did the system administrator report unusual CRM traffic?

Tuesday at 9 a.m.

Which unusual listening TCP port triggered the Argous investigation?

TCP 4444.

What process was listening on TCP port 4444?

Office_Remoter.exe.

What did the responder observe besides the TCP 4444 listener?

Active connections to TCP port 4444.

What second suspicious process did the responder find?

Office_Technet.exe.

Which destination did Office_Technet.exe contact?

social.technet.microsoft.com.

Which destination port did Office_Technet.exe use?

TCP 443.

What immediate response did the responder take on the CRM server?

Terminated Office_Remoter.exe and Office_Technet.exe.

Why was declaring the CRM server restored premature?

The team had not investigated the wider network or root cause.

How long before discovery did Green Penguin first scan Argous?

Roughly three months.

What was Green Penguin's first attack phase?

Reconnaissance of Argous's public IP space.

What network tool did attackers use to hide their source IP?

A VPN.

What evidence did the initial reconnaissance generate?

Firewall scan alerts.

Why were the VPN source IPs significant?

They were already known as malicious.

What was Argous mistake #1?

Ignoring firewall alerts about pre-attack reconnaissance.

What was Argous mistake #2?

Not using threat intelligence to recognize known-malicious IPs.

Why was treating blocked scans as harmless a mistake?

Blocked traffic was still evidence of targeting.

What vulnerability provided the initial compromise of the CRM server?

Command injection in an enabled, unused web plugin.

Did the attacker need to log in before exploiting the CRM plugin?

No.

What capability did CRM command injection give Green Penguin?

Execution of arbitrary commands on the server.

What did the attackers deploy after compromising the CRM server?

Command-and-control (C2) remote access.

Which two vulnerability classes had earlier penetration testing identified?

Server-Side Request Forgery (SSRF) and command injection.

What was Argous mistake #3?

Failing to remediate previously reported web application vulnerabilities.

Why did Argous defer the CRM vulnerability fixes?

Management prioritized revenue-generating development work.

What made the compromised CRM host useful as a pivot?

It had both public and private IP addresses.

What does dual-homed mean in the Argous scenario?

The server connects to both external and internal networks.

Which malware acted as the Argous internal-network proxy?

Office_Remoter.exe.

Which port did Office_Remoter.exe listen on?

TCP 4444.

What did Office_Remoter.exe allow Green Penguin to do?

Forward traffic into the internal network around the firewall.

What was Argous mistake #4?

Unnecessarily maintaining a dual-homed CRM server.

What was Argous mistake #5?

Lacking network monitoring inside the firewall.

What did attackers discover in the CRM database?

Usernames and password hashes.

How did the attackers use the CRM password hashes?

They cracked passwords to obtain usable credentials.

Why did cracked CRM credentials enable lateral movement?

Users reused the same passwords for Windows domain accounts.

Which privileged account did attackers compromise using CRM credential reuse?

A database administrator with local administrator access.

What was Argous mistake #6?

Allowing easily cracked passwords.

What was Argous mistake #7?

Reusing CRM passwords for Windows domain authentication.

What repeated local account did Green Penguin find on Argous computers?

AssetMgtAcct.

Where did Green Penguin extract NT password hashes?

From memory on the database server.

How did Green Penguin crack the AssetMgtAcct password?

Offline cracking with cloud computing resources.

How long did cracking the AssetMgtAcct password take?

A few days.

What made AssetMgtAcct especially dangerous?

Its password was identical across machines.

What was Argous mistake #8?

Reusing the asset-management account password on every system.

What high-value system did the attackers eventually compromise?

The domain controller.

What persistence backup did the attackers deploy?

A secondary listener on an internal file server.

What outbound activity did additional malware perform?

Beaconing to a known-malicious IP.

What was Argous mistake #9?

No alerts for new software installed on critical systems.

How did Office_Technet.exe implement command and control?

Through posts on Microsoft TechNet forums.

What legitimate-looking protocol and destination aided the C2 traffic?

HTTPS over TCP 443 to a Microsoft-hosted forum.

How many other systems still had malware after the CRM processes were killed?

Three.

What initial access weakness remained after the quick response?

The CRM command-injection vulnerability.

What other remote access remained available to the attackers?

Reverse TCP connections from internal systems.

What was Argous mistake #10?

Failing to block incoming TCP 4444 traffic at the firewall.

What was Argous mistake #11?

Not scanning the rest of the network for indicators of compromise.

What does IOC stand for?

Indicator of compromise.

Why must incident handlers scope beyond the first compromised host?

Attackers may already have lateral access and persistence elsewhere.

What is the key containment lesson from the Argous incident?

Stop attacker access across the environment, not only suspicious local processes.

What was the case's root-cause remediation requirement?

Fix the vulnerable CRM application plugin.