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*
TEAMTNT HACKERS TARGET YOUR POORLY CONFIGURED DOCKER SERVERS
By
BILL TOULAS
* November 9, 2021
* 03:57 PM
* 0
Poorly configured Docker servers and being actively targeted by the TeamTNT
hacking group in an ongoing campaign started last month.
According to a report by researchers at TrendMicro, the actors have three
distinct goals: to install Monero cryptominers, scan for other vulnerable
Internet-exposed Docker instances, and perform container-to-host escapes to
access the main network.
As illustrated in an attack workflow, the attack starts with creating a
container on the vulnerable host using an exposed Docker REST API.
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TeamTNT Docker abuse workflow
Source: TrendMicro
TeamTNT then uses compromised, or actor-controlled Docker Hub accounts to host
malicious images and deploy them on a targeted host.
TrendMicro has seen over 150,000 pulls of images from the malicious Docker Hub
accounts as part of this campaign.
Next, the dropped container executes cronjobs and fetches various
post-exploitation and lateral movement tools, including container escaping
scripts, credential stealers, and cryptocurrency miners.
When scanning for other vulnerable instances, the threat actors check ports
2375, 2376, 2377, 4243, 4244, which has been observed in past DDoS botnet
campaigns.
The actors also attempt to collect server info such as the OS type,
architecture, number of CPU cores, container registry, and the current swarm
participation status.
The container image that is created is based on the AlpineOS system and is
executed with flags that allow root-level permissions on the underlying host.
Similarities between old and past container image samples
Source: TrendMicro
Finally, the IP address that is used for TeamTNT’s current infrastructure
(45[.]9[.]148[.]182) has been associated with multiple domains that served
malware in the past.
PREVIOUS CAMPAIGN LAID THE GROUNDWORK
TrendMicro reports that this campaign also uses compromised Docker Hub accounts
controlled by TeamTNT to drop malicious Docker images.
Using compromised Docker Hub accounts makes the distribution points more
reliable for the actors, as they are harder to map, report, and takedown.
The actors were spotted collecting Docker Hub credentials in a previous campaign
analyzed by TrendMicro in July when credentials stealers were deployed in
attacks.
"Our July 2021 research into TeamTNT showed that the group previously used
credential stealers that would rake in credentials from configuration files.
This could be how TeamTNT gained the information it used for the compromised
sites in this attack," explains TrendMicro's research published today.
As such, TeamTNT demonstrates a high level of operational planning, being
organized and purposeful in their goals.
PERMANENT THREAT TO DOCKER SYSTEMS
TeamTNT is a sophisticated actor that constantly evolves its techniques, shifts
short-term targeting focus but remains a constant threat to vulnerable Docker
systems.
They first created a worm to exploit Docker and Kubernetes en masse back in
August 2020.
In October 2020, the actors added Monero mining and credential-stealing
capabilities, targeting Docker instances.
In January 2021, TeamTNT upgraded its miners with sophisticated detection
evasion tricks while still harvesting user credentials from the compromised
servers.
Docker provides some "mandatory" tips that can be used lock down Docker's REST
API and prevent these types of attacks.
"Therefore it is mandatory to secure API endpoints with HTTPS and certificates.
It is also recommended to ensure that it is reachable only from a trusted
network or VPN," explains Docker's security guide.
RELATED ARTICLES:
Popular NPM library hijacked to install password-stealers, miners
MyKings botnet still active and making massive amounts of money
Huawei Cloud targeted by updated cryptomining malware
OMIGOD: Microsoft Azure VMs exploited to drop Mirai, miners
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BILL TOULAS
Bill Toulas is a technology writer and infosec news reporter with over a decade
of experience working on various online publications. An open source advocate
and Linux enthusiast, is currently finding pleasure in following hacks, malware
campaigns, and data breach incidents, as well as by exploring the intricate ways
through which tech is swiftly transforming our lives.
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