Singaporeans Turn to Bitcoin Mining

Many Singaporeans have recently caught up with the Bitcoin craze, causing a rash increase in demand for mining rig and graphics cards in the country.
16 November 2017   1876

According to Channel News Asia  one Singapore-based mining rig manufacturer has experienced a sharp increase in sales in recent months as the demand for cryptocurrency mining computers has grew up to more than 100 rigs per month as of November 2017 from about 15 in July.

However, the demand is not limited on rigs alone. In fact, cryptocurrency exchanges such as Coinhako and Quoine have both experienced double-digit growth in the demand for cryptocurrencies since the beginning of this year.

The influx of new investors has consequently helped pull the Bitcoin price as it increases between $6,000 and $7,000 in mid-November 2017 from around $1,000 in January.

With such promising growth, a lot of people have turned to mining to make a passive income and take part in the cryptocurrency market with the growth rates showing no signs of slowing down.

 

Exim Mail Servers to Undergo Massive Attacks

Hackers are using fixed vulnerability, which was found last week, but still more than 3.6M mail servers in the global network remain potentially vulnerable
14 June 2019   245

Cybereason security researchers warned mail server administrators about the discovery of a massive automated attack that exploits a critical vulnerability (CVE-2019-10149) of Exim that was discovered last week. During the attack, hackers seek to execute their code as root and install malware for mining cryptocurrency on the server.

According to the Shodan service, more than 3.6 million mail servers in the global network remain potentially vulnerable, and are not updated to the latest release of Exim 4.92. About 2 million potentially vulnerable servers are located in the USA, 192 thousand in Russia. According to RiskIQ, version 4.92 has already switched 70% of servers to Exim.

Vulnerable Exim Servers
Vulnerable Exim Servers

Administrators are advised to urgently install updates that were prepared last week (Debian, Ubuntu, openSUSE, Arch Linux, Fedora, EPEL for RHEL / CentOS). If there is a defeated version of Exim in the system (from 4.87 to 4.91 inclusive), you need to make sure that the system is no longer compromised by checking the crontab for suspicious calls and to ensure that there are no additional keys in the /root/.ssh directory. The attack can also be indicated by the presence in the log of the firewall of activity from the hosts an7kmd2wp4xo7hpr.tor2web.su, an7kmd2wp4xo7hpr.tor2web.io and an7kmd2wp4xo7hpr.onion.sh, which are used for during the malware download process.

The first attacks on Exim servers were recorded on June 9th. By June 13, the attack became widespread. After exploiting the vulnerabilities through the tor2web gateways, the Tor hidden service (an7kmd2wp4xo7hpr) downloads a script that checks for OpenSSH (if not installed), changes its settings (allows root login and key authentication) and sets the root user for the root user access to the system via SSH.

After setting up the backdoor, a port scanner is installed in the system to identify other vulnerable servers. It also searches the system for existing mining systems that are deleted if detected. At the last stage, the own miner is loaded and registered in the crontab. The miner is loaded under the guise of an ico-file (in fact, is a zip-archive with the password "no-password"), in which the executable file in ELF format for Linux with Glibc 2.7+ is packed.