Old botnet returns to impact organizations globally: Study

There is a new surge in infections by the well-known Phorpiex botnet which has made it November’s most prevalent malware, impacting 4% of organizations globally, according to Check Point Research’s Global Threat Index for November 2020.  Phorpiex was last seen in the Threat Index’s top 10 in June this year.

The Phorpiex botnet was first reported in 2010, and at its peak controlled more than a million infected hosts. Known for distributing other malware families via spam as well as fueling large-scale cryptomining, Phorpiex has again been distributing the Avaddon ransomware, as Check Point researchers originally reported earlier this year. Avaddon is a relatively new Ransomware-as-a-Service (RaaS) variant, and its operators have again been recruiting affiliates to distribute the ransomware for a cut of the profits. Avaddon has been distributed via JS and Excel files as part of malspam campaigns and is able to encrypt a wide range of file types.

“Phorpiex is one of the oldest and most persistent botnets, and has been used by its creators for many years to distribute other malware payloads such as GandCrab and Avaddon ransomware. This new wave of infections is now spreading another ransomware campaign, which shows just how effective a tool Phorpiex is,” said Maya Horowitz, Director, Threat Intelligence & Research, Products at Check Point. “Organizations should educate employees about how to identify potential malspam and to be wary of opening unknown attachments in emails, even if they appear to come from a trusted source. They should also ensure they deploy security that actively prevents them from infecting their networks.”

The research team also warns that “HTTP Headers Remote Code Execution (CVE-2020-13756)” is the most common exploited vulnerability, impacting 54% of organizations globally, followed by “MVPower DVR Remote Code Execution” impacted 48% of organizations worldwide and “Dasan GPON Router Authentication Bypass (CVE-2018-10561) impacted 44% of organizations globally.

Top malware families

*The arrows relate to the change in rank compared to the previous month.

This month, Phorpiex is the most popular malware with a global impact of 4% of organizations, closely followed by Dridex and Hiddad which both impacted 3% of organizations worldwide.

1. ↑ Phorpiex – Phorpiex is a botnet known for distributing other malware families via spam campaigns.
2. ↑ Dridex – Dridex is a Trojan that targets the Windows platform and is reportedly downloaded via a spam email attachment. Dridex contacts a remote server and sends information about the infected system. It can also download and execute arbitrary modules received from the remote server.
3. ↔ Hiddad – Hiddad is an Android malware infection which repackages legitimate mobile apps and then releases them to a third-party store. Its main function is to display ads, but it can also gain access to key security details built into the OS.

Top exploited vulnerabilities

This month “HTTP Headers Remote Code Execution (CVE-2020-13756)” is the most common exploited vulnerability, impacting 54% of organizations globally, followed by “MVPower DVR Remote Code Execution” impacted 48% of organizations worldwide and “Dasan GPON Router Authentication Bypass (CVE-2018-10561)” impacted 44% of organizations globally.

1. ↑ HTTP Headers Remote Code Execution (CVE-2020-13756) – HTTP headers let the client and the server pass additional information with an HTTP request. A remote attacker may use a vulnerable HTTP Header to run arbitrary code on the victim machine.
2. ↓ MVPower DVR Remote Code Execution – Remote code execution vulnerability exists in MVPower DVR devices. A remote attacker can exploit this weakness to execute arbitrary code in the affected router via a crafted request.
3. ↓Dasan GPON Router Authentication Bypass (CVE-2018-10561) – An authentication bypass vulnerability that exists in Dasan GPON routers. Successful exploitation of this vulnerability would allow remote attackers to obtain sensitive information and gain unauthorized access into the affected system.

Top mobile malwares

This month Hiddad remains the most prevalent Mobile malware, followed by xHelper and Lotoor.

1. Hiddad – Hiddad is an Android malware infection which repackages legitimate apps and then releases them to a third-party store. Its main function is to display ads, but it can also gain access to key security details built into the OS.
2. xHelper – xHelper is a malicious application seen in the wild since March 2019, used for downloading other malicious apps and display advertisement. The application is capable of hiding itself from the user and reinstalling itself in case it is uninstalled.
3. Lotoor – Lotoor is a hack tool that exploits vulnerabilities on Android operating system in order to gain root privileges on compromised mobile devices.