The US Secret Service sent out a security alert last month to the US private sector and government organizations warning about an increase in hacks of managed service providers (MSPs).
MSPs provide remote management software for companies. MSPs can be simple services like file-sharing systems to complete solutions that manage a customer's entire computer fleet.
Most MSP services are built around a server-client software architecture. The server part can be remotely hosted with the MSP inside a cloud infrastructure, or installed on-premise with the client. Usually, getting access to the server component of an MSP grants an attacker full control of all software clients.
In a security alert sent out on June 12, Secret Service officials said their investigations team (GIOC -- Global Investigations Operations Center) has been seeing an increase in incidents where hackers breach MSP solutions and use them as a springboard into the internal networks of the MSP's customers.
Secret Service officials said they've been seeing threat actors use hacked MSPs to carry out attacks against point-of-sale systems, to perform business email compromise (BEC) scams, and to deploy ransomware.
The alert, which ZDNet obtained a copy here, contains best practices to be implemented by MSPs and their respective customers.
Attacks against MSPs have only recently made the headlines, with a surge in attacks in 2019, when ransomware gangs such as GandCrab or REvil (Sodinokibi) began targeting MSPs and then infect their customers.
In a report published in October 2019, threat intelligence firm Armor said it identified at least 13 MSPs that were hacked in 2019 and had their infrastructure abused to deploy ransomware on the networks of their customers.
In a phone call today with ZDNet, Kyle Hanslovan, CEO at Huntress Labs, said his company provided support in at least 63 incidents of MSP hacks in 2019 that resulted in ransomware on customer networks; however, Hanslovan suspects the number of total incidents to be well over 100 last year.
One of the largest MSP vendors on the market, ConnectWise, has had its products and services often targeted by hackers. In November 2019, ConnectWise sent out an internal alert to its customers about ransomware gangs exploiting improperly configured installations of its on-premise ConnectWise Automate product to breach customer networks and deploy file-encrypting payloads.
In June 2020, ConnectWise patched an Automate API vulnerability that hackers had also used to breach companies and deploy ransomware. ZDNet has been told that this vulnerability and the subsequent exploitation is what prompted the Secret Service to send out its alert.
The Secret Service alert is actually the second security alert that US authorities have sent out about attacks on MSPs. The National Cybersecurity and Communications Integration Center (NCCIC) sent out the first one in October 2018 when they warned of ongoing attempts from state-sponsored hacking groups to breach MSPs, and especially attacks targeting cloud-based service providers.
This first alert was sent out at a time when Chinese hacking groups had been focusing on breaching cloud-based managed providers as a way to compromise larger companies through their software supply chain. This time around, the Secret Service is warning of similar attacks, but carried out by day-to-day cybercrime gangs rather than state-sponsored hackers.