Researchers noticed a brand new refined peer-to-peer (P2P) botnet, dubbed FritzFrog, that has been actively focusing on SSH servers since January 2020.

FritzFrog is a brand new refined botnet that has been actively focusing on SSH servers worldwide since January 2020.

The bot is written in Golang and implements wormable capabilities, consultants reported assaults in opposition to entities in authorities, schooling, and finance sectors.

The FritzFrog is a modular, multi-threaded, and file-less botnet that outstands for using a proprietary and fileless P2P implementation that has been written from scratch.

In response to the Guardicore Labs researchers, the malware already contaminated over 500 servers within the U.S. and Europe belonging to universities and a railway firm.

“FritzFrog is a extremely refined peer-to-peer (P2P) botnet that has been actively breaching SSH servers worldwide. With its decentralized infrastructure, it distributes management amongst all its nodes. On this community with no single point-of-failure, friends always talk with one another to maintain the community alive, resilient and up-to-date.” reads the report printed by Guardicore Lab.

“FritzFrog is totally proprietary; its P2P implementation was written from scratch, educating us that the attackers are extremely skilled software program builders.”

The botnet’s P2P communication is encrypted utilizing AES for symmetric encryption and the Diffie-Hellman protocol for key change.

The bot is ready to set up a backdoor on the contaminated methods in an effort to obtain continued entry.

Not like different P2P botnets, FritzFrog doesn’t use IRC like IRCflu, it operates in-memory in contrast to DDG, and targets Unix-based methods.

FritzFrog shares some similarities with Rakos Golang-based Linux bot that was noticed focusing on methods by way of brute drive makes an attempt at SSH logins.

Probably the most fascinating options of FritzFrog is that it’s fully fileless, because of this it assembles and executes payloads immediately into the reminiscence of the contaminated system.

“To share and change recordsdata between nodes, Fritzfrog makes use of a stealthy, fileless method. Recordsdata are cut up into blobs – bulks of binary knowledge – that are saved in reminiscence. The malware retains observe of the out there blobs by storing them in a map along with every blob’s hash worth.” continues the report.

“When a node A needs to obtain a file from its peer, node B, it could actually question node B which blobs it owns utilizing the command getblobstats. Then, node A can get a particular blob by its hash, both by the P2P command getbin or over HTTP, with the URL http://:1234/. When node A has all of the wanted blobs – it assembles the file utilizing a particular module named Assemble and runs it.”

Consultants identified that the botnet is extra aggressive in its brute-force makes an attempt.

As soon as the botnet has recognized a brand new potential goal, the malicious code makes an attempt to realize entry with brute-force assaults after which to contaminate the accessed machine with malicious payloads.

To stay below the radar, the malware course of runs below the names ifconfig and nginx, then it listens on port 1234 ready for instructions.

The instructions themselves are transmitted to the malware via a sequence of hoops designed to keep away from detection.

To evade detection, as a substitute of sending instructions immediately over port 1234, the instructions are despatched to the sufferer with a particular process. The attacker first connects to the sufferer over SSH and runs a netcat shopper on the sufferer’s machine, which in flip connects to the malware’s server. Then ant command despatched over SSH might be used as netcat’s enter and redirected to the malware.

FritzFrog cryptocurrency P2P botnet targets Linux servers over SSHSecurity

The malware runs a separate course of, named “libexec,” that permits operators to mine Monero cash and established a backdoor entry by including a public key to the SSH’s “authorized_keys.”

In response to the consultants, the botnet has been lively since January 9, it has reached a cumulative of 13,000 assaults that employed 20 completely different variations of the malware binary.

FritzFrog has been discovered to brute-force tens of millions of IP addresses belonging to governmental organizations, medical facilities, banks, and telecom corporations.

Guardicore Labs researchers developed and launched a detection script that could possibly be used to find out if a server has been contaminated by FritzFrog.

Pierluigi Paganini

(SecurityAffairs – hacking, FritzFrog)



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