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WikiLeaks' Vault 7 released documents from the CherryBlossom project.

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Cherry Blossom
15 June, 2017

Today, June 15th 2017, WikiLeaks publishes documents from the CherryBlossom project of the CIA that was developed and implemented with the help of the US nonprofit Stanford Research Institute (SRI International).

CherryBlossom provides a means of monitoring the Internet activity of and performing software exploits on Targets of interest. In particular, CherryBlossom is focused on compromising wireless networking devices, such as wireless routers and access points (APs), to achieve these goals. Such Wi-Fi devices are commonly used as part of the Internet infrastructure in private homes, public spaces (bars, hotels or airports), small and medium sized companies as well as enterprise offices. Therefore these devices are the ideal spot for "Man-In-The-Middle" attacks, as they can easily monitor, control and manipulate the Internet traffic of connected users. By altering the data stream between the user and Internet services, the infected device can inject malicious content into the stream to exploit vulnerabilities in applications or the operating system on the computer of the targeted user.

The wireless device itself is compromized by implanting a customized CherryBlossom firmware on it; some devices allow upgrading their firmware over a wireless link, so no physical access to the device is necessary for a successful infection. Once the new firmware on the device is flashed, the router or access point will become a so-called FlyTrap. A FlyTrap will beacon over the Internet to a Command & Control server referred to as the CherryTree. The beaconed information contains device status and security information that the CherryTree logs to a database. In response to this information, the CherryTree sends a Mission with operator-defined tasking. An operator can use CherryWeb, a browser-based user interface to view Flytrap status and security info, plan Mission tasking, view Mission-related data, and perform system administration tasks.

Missions may include tasking on Targets to monitor, actions/exploits to perform on a Target, and instructions on when and how to send the next beacon. Tasks for a Flytrap include (among others) the scan for email addresses, chat usernames, MAC addresses and VoIP numbers in passing network traffic to trigger additional actions, the copying of the full network traffic of a Target, the redirection of a Target’s browser (e.g., to Windex for browser exploitation) or the proxying of a Target’s network connections. FlyTrap can also setup VPN tunnels to a CherryBlossom-owned VPN server to give an operator access to clients on the Flytrap’s WLAN/LAN for further exploitation. When the Flytrap detects a Target, it will send an Alert to the CherryTree and commence any actions/exploits against the Target. The CherryTree logs Alerts to a database, and, potentially distributes Alert information to interested parties (via Catapult).

There's a lengthy technical article about it.

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Advanced CIA firmware has been infecting Wi-Fi routers for years
Latest Vault7 release exposes network-spying operation CIA kept secret since 2007.

Home routers from 10 manufacturers, including Linksys, DLink, and Belkin, can be turned into covert listening posts that allow the Central Intelligence Agency to monitor and manipulate incoming and outgoing traffic and infect connected devices. That's according to secret documents posted Thursday by WikiLeaks.

CherryBlossom, as the implant is code-named, can be especially effective against targets using some D-Link-made DIR-130 and Linksys-manufactured WRT300N models because they can be remotely infected even when they use a strong administrative password. An exploit code-named Tomato can extract their passwords as long as a default feature known as universal plug and play remains on. Routers that are protected by a default or easily-guessed administrative password are, of course, trivial to infect. In all, documents say CherryBlossom runs on 25 router models, although it's likely modifications would allow the implant to run on at least 100 more.



The 175-page CherryBlossom user guide describes a Linux-based operating system that can run on a broad range of routers. Once installed, CherryBlossom turns the device into a "FlyTrap" that beacons a CIA-controlled server known as a "CherryTree." The beacon includes device status and security information that the CherryTree logs to a database. In response, the CherryTree sends the infected device a "Mission" consisting of specific tasks tailored to the target. CIA operators can use a "CherryWeb" browser-based user interface to view Flytrap status and security information, plan new missions, view mission-related data, and perform system administration tasks.

Missions can target connected users based on IPs, e-mail addresses, MAC addresses, chat user names, and VoIP numbers. Mission tasks can include copying all or only some of the traffic; copying e-mail addresses, chat user names, and VoIP numbers; invoking a feature known as "Windex," which redirects a user's browser that attempts to perform a drive-by malware attack; establishing a virtual private network connection that gives access to the local area network; and the proxying of all network connections.



All the communications between the FlyTrap and the CIA-controlled CherryTree, with the exception of copied network data, is encrypted and cryptographically authenticated. For extra stealth, the encrypted data masquerades as a browser cookie in an HTTP GET request for an image file. The CherryTree server then responds to the request with a corresponding binary image file.

A decade of hacking routers

In many respects, CherryBlossom isn't much different from DNSChanger and other types of router malware that have infected hundreds of thousands of devices over the past few years. What sets the CIA implant apart the most is its full suite of features, including its user interface, command-server support, and a long list of mission tasks. Also significant: the documents date back to 2007, when router hacking was less developed than it is now.

CherryBlossom is the latest release in WikiLeaks Vault7 series, which the site purports was made possible when the "CIA lost control of the majority of its hacking arsenal." CIA officials have declined to confirm or deny the authenticity of the documents, but based on the number of pages and unique details exposed in the series, there is broad consensus among researchers that the documents are actual CIA materials.

What's more, researchers from security firm Symantec have definitively linked at least one Vault7 release to an advanced hacking operation that has been penetrating governments and private industries around the world for years. While WikiLeaks said Vault7 was intended to "initiate a public debate about the security, creation, use, proliferation, and democratic control of cyberweapons," little or nothing published to date has shown the CIA running afoul of its legal mandate.

Like the other Vault7 releases, Thursday's installment doesn't include the source code or binaries that would allow other hacker groups to appropriate the CIA's router-hijacking capabilities. That makes the leaks significantly less damaging than those by the Shadow Brokers, the name used by a still-unknown group that has been published advanced hacking tools developed by and later stolen from the National Security Agency. April's release of an NSA-developed tool codenamed EternalBlue resulted in the WCry outbreak that infected an estimated 727,000 computers in 90 countries.

Thursday's Vault7 release does, however, provide so-called indicators of compromise that targets can use to determine if they were hacked. As pointed out by a researcher who tweets under the handle Xorz, it may allow people to identify CIA-controlled CherryTree servers, since they all seem to use the word "CherryWeb" in their default URLs.

A general defense more technically inclined users can take against router-based malware that monitors and tampers with Internet traffic is to put the router in question into passive mode and connect it to network hub and a trusted router. This allows the person to see all traffic going into and out of the network.