The Life Cycle of a Compromised (Cloud) Server

Trend Micro Research has developed a go-to resource for all things related to cybercriminal underground hosting and infrastructure. Today we released the second in this three-part series of reports which detail the what, how, and why of cybercriminal hosting (see the first part here).

As part of this report, we dive into the common life cycle of a compromised server from initial compromise to the different stages of monetization preferred by criminals. It’s also important to note that regardless of whether a company’s server is on-premise or cloud-based, criminals don’t care what kind of server they compromise.

To a criminal, any server that is exposed or vulnerable is fair game.

Cloud vs. On-Premise Servers

Cybercriminals don’t care where servers are located. They can leverage the storage space, computation resources, or steal data no matter what type of server they access. Whatever is most exposed will most likely be abused.

As digital transformation continues and potentially picks up to allow for continued remote working, cloud servers are more likely to be exposed. Many enterprise IT teams, unfortunately, are not arranged to provide the same protection for cloud as on-premise servers.

As a side note, we want to emphasize that this scenario applies only to cloud instances replicating the storage or processing power of an on-premise server. Containers or serverless functions won’t fall victim to this same type of compromise. Additionally, if the attacker compromises the cloud account, as opposed to a single running instance, then there is an entirely different attack life cycle as they can spin up computing resources at will. Although this is possible, however, it is not our focus here.

Attack Red Flags

Many IT and security teams might not look for earlier stages of abuse. Before getting hit by ransomware, however, there are other red flags that could alert teams to the breach.

If a server is compromised and used for cryptocurrency mining (also known as cryptomining), this can be one of the biggest red flags for a security team. The discovery of cryptomining malware running on any server should result in the company taking immediate action and initiating an incident response to lock down that server.

This indicator of compromise (IOC) is significant because while cryptomining malware is often seen as less serious compared to other malware types, it is also used as a monetization tactic that can run in the background while server access is being sold for further malicious activity. For example, access could be sold for use as a server for underground hosting. Meanwhile, the data could be exfiltrated and sold as personally identifiable information (PII) or for industrial espionage, or it could be sold for a targeted ransomware attack. It’s possible to think of the presence of cryptomining malware as the proverbial canary in a coal mine: This is the case, at least, for several access-as-a-service (AaaS) criminals who use this as part of their business model.

Attack Life Cycle

Attacks on compromised servers follow a common path:

The monetization lifecycle of a compromised server

Often, targeted ransomware is the final stage. In most cases, asset categorization reveals data that is valuable to the business but not necessarily valuable for espionage.

A deep understanding of the servers and network allows criminals behind a targeted ransomware attack to hit the company where it hurts the most. These criminals would know the dataset, where they live, whether there are backups of the data, and more. With such a detailed blueprint of the organization in their hands, cybercriminals can lock down critical systems and demand higher ransom, as we saw in our 2020 midyear security roundup report.

In addition, while a ransomware attack would be the visible urgent issue for the defender to solve in such an incident, the same attack could also indicate that something far more serious has likely already taken place: the theft of company data, which should be factored into the company’s response planning. More importantly, it should be noted that once a company finds an IOC for cryptocurrency, stopping the attacker right then and there could save them considerable time and money in the future.

Ultimately, no matter where a company’s data is stored, hybrid cloud security is critical to preventing this life cycle.

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INTERPOL Collaboration Reduces Cryptojacking by 78%

Cybercriminals are often seen as having the upper hand over the “white hat” community. After all, they’re anonymous, can launch attacks from virtually anywhere in the world, and usually have the element of surprise. But there’s one secret weapon the good guys have: Collaboration. That’s why Trend Micro has always prioritized its partnerships with law enforcement, academia, governments and other cybersecurity businesses.

We’re proud to have contributed to yet another successful collaborative operation with INTERPOL Global Complex for Innovation (IGCI) in Singapore that’s helped to reduce the number of users infected by cryptomining malware by 78%.

Cryptomining On The Rise

Also known as cryptojacking, these attacks have become an increasingly popular way for cybercriminals to make money.

Why?

Because victims don’t know they’ve been infected. The malware sits on their machine in the background mining for digital currency 24/7/365. Increasingly, hackers have taken to launching sophisticated attacks against enterprise IT systems and cloud servers to increase their mining and earning potential. But many still target home computer systems like routers, as these are often left relatively unprotected. Stitch enough of these devices together in a botnet and they have a ready-made cash cow.

That’s why cryptojacking remained the most detected threat in the first half of 2019 in terms of file-based threat components, according to our data.

Unlike serious data breaches, phishing attacks, ransomware and banking Trojans, cryptojacking doesn’t have major impact on the victim. They don’t lose sensitive personal data, there’s no risk of follow-on identity fraud and they’re not extorted for funds by being locked out of their PC.

However, it’s not without consequences: Cryptomining malware can slow your home network to a crawl while running up serious energy bills. It may even bring your home computers to a premature end. Also, there’s always the risk with any kind of malware infection that hackers may switch tactics and use their footprint on your home machines to launch other attacks in the future.

Enter Operation Goldfish Alpha

That’s why we were keen to offer our assistance to INTERPOL during this year’s Operation Goldfish Alpha. Thanks to our broad global visibility into attack trends and infection rates, we were able to articulate the scale of the cryptojacking threat and key mitigation steps, at a pre-operation meeting with ASEAN law enforcement officers in June.

A few months later, we developed and disseminated a key Cryptojacking Mitigation and Prevention guidance document. It details how a vulnerability in MikroTik routers had exposed countless users in the region to the risk of compromise by cryptomining malware. The document explains how to scan for this flaw using Trend Micro HouseCall for Home Networks, and how HouseCall can be used to detect and delete the Coinhive JavaScript that hackers were using to mine for digital currency on infected PCs.

Spectacular Success

Over the five months of Operation Goldfish Alpha, experts from national Computer Emergency Response Teams (CERTs) and police across 10 countries in the region worked to locate the infected routers, notify the victims and use our guidance document to patch the bugs and kick out the hackers.

Having helped to identify over 20,000 routers in the region that were hacked in this way, we’re delighted to say that by November, the number had reduced by at least 78%.

That’s the value of partnerships between law enforcement and private cybersecurity companies: They combine the power of investigative policing with the detailed subject matter expertise, visibility and resources of industry experts like us. We’ll continue to lend a hand wherever we can to make our connected, digital world a safer place.

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