• Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
MUST READ

Coyote malware is first-ever malware abusing Windows UI Automation

 | 

SonicWall fixed critical flaw in SMA 100 devices exploited in Overstep malware attacks

 | 

DSPM & AI Are Booming: $17.87B and $4.8T Markets by 2033

 | 

Stealth backdoor found in WordPress mu-Plugins folder

 | 

U.S. CISA adds CrushFTP, Google Chromium, and SysAid flaws to its Known Exploited Vulnerabilities catalog

 | 

U.S. CISA urges FCEB agencies to fix two Microsoft SharePoint flaws immediately and added them to its Known Exploited Vulnerabilities catalog

 | 

Sophos fixed two critical Sophos Firewall vulnerabilities

 | 

French Authorities confirm XSS.is admin arrested in Ukraine

 | 

Microsoft linked attacks on SharePoint flaws to China-nexus actors

 | 

Cisco confirms active exploitation of ISE and ISE-PIC flaws

 | 

SharePoint under fire: new ToolShell attacks target enterprises

 | 

CrushFTP zero-day actively exploited at least since July 18

 | 

Hardcoded credentials found in HPE Aruba Instant On Wi-Fi devices

 | 

MuddyWater deploys new DCHSpy variants amid Iran-Israel conflict

 | 

U.S. CISA urges to immediately patch Microsoft SharePoint flaw adding it to its Known Exploited Vulnerabilities catalog

 | 

Microsoft issues emergency patches for SharePoint zero-days exploited in "ToolShell" attacks

 | 

SharePoint zero-day CVE-2025-53770 actively exploited in the wild

 | 

Singapore warns China-linked group UNC3886 targets its critical infrastructure

 | 

U.S. CISA adds Fortinet FortiWeb flaw to its Known Exploited Vulnerabilities catalog

 | 

SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 54

 | 
  • Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
  • Home
  • Breaking News
  • Hacking
  • Security
  • Threat actors exploit a flaw in Digium Phone Software to target VoIP servers

Threat actors exploit a flaw in Digium Phone Software to target VoIP servers

Pierluigi Paganini July 16, 2022

Threat actors are targeting VoIP servers by exploiting a vulnerability in Digium’s software to install a web shell, Palo Alto Networks warns.

Recently, Unit 42 researchers spotted a campaign targeting the Elastix system used in Digium phones since December 2021. Threat actors exploited a vulnerability, tracked as CVE-2021-45461 (CVSS score 9.8), in the Rest Phone Apps (restapps) module to implant a web shell on VoIP servers. The attackers used the web shell to exfiltrate data by dropping additional payloads inside the target’s Digium phone software.

“As of this writing, we have witnessed more than 500,000 unique malware samples of this family over the period spanning from late December 2021 till the end of March 2022. The malware installs multilayer obfuscated PHP backdoors to the web server’s file system, downloads new payloads for execution and schedules recurring tasks to re-infect the host system.” reads the advisory published by Palo Alto Networks Unit 42. “Moreover, the malware implants a random junk string to each malware download in an attempt to evade signature defenses based on indicators of compromise (IoCs).”

The researchers observed a high volume of malicious traffic likely originating from more than 500,000 unique samples over the period spanning from mid-December 2021 till the end of March 2022. The traffic targets Digium open source Asterisk communication software for VoIP phone devices.

The malicious campaign has many similarities to the INJ3CTOR3 report detailed by Check Point Research in 2020 two years ago, experts speculate it could be a resurgence of this campaign

The attack chains start with a code retrieving a shell script dropper from a remote server, which, in turn, downloads and executes obfuscated PHP backdoor in multiple locations in the file system.

Digium Phones

The PHP backdoor also creates several root user accounts and set up a scheduled task to maintain the persistence and re-infect the host system.

The malware supports arbitrary commands via the cmd request parameter along with built-in default commands that can allow operators to carry out malicious activities,

“The strategy of implanting web shells in vulnerable servers is not a new tactic for malicious actors. The only way to catch advanced intrusions is a defense-in-depth strategy. Only by orchestrating multiple security appliances and applications in a single pane can defenders detect these attacks.” concludes the report.

Follow me on Twitter: @securityaffairs and Facebook

[adrotate banner=”9″][adrotate banner=”12″]

Pierluigi Paganini

(SecurityAffairs – hacking, Digium Phones)

[adrotate banner=”5″]

[adrotate banner=”13″]


facebook linkedin twitter

Digium Phones Hacking hacking news information security news IT Information Security Pierluigi Paganini Security Affairs Security News VOIP

you might also like

Pierluigi Paganini July 24, 2025
Coyote malware is first-ever malware abusing Windows UI Automation
Read more
Pierluigi Paganini July 24, 2025
SonicWall fixed critical flaw in SMA 100 devices exploited in Overstep malware attacks
Read more

leave a comment

newsletter

Subscribe to my email list and stay
up-to-date!

    recent articles

    Coyote malware is first-ever malware abusing Windows UI Automation

    Malware / July 24, 2025

    SonicWall fixed critical flaw in SMA 100 devices exploited in Overstep malware attacks

    Security / July 24, 2025

    DSPM & AI Are Booming: $17.87B and $4.8T Markets by 2033

    Security / July 24, 2025

    Stealth backdoor found in WordPress mu-Plugins folder

    Malware / July 24, 2025

    U.S. CISA adds CrushFTP, Google Chromium, and SysAid flaws to its Known Exploited Vulnerabilities catalog

    Hacking / July 24, 2025

    To contact me write an email to:

    Pierluigi Paganini :
    pierluigi.paganini@securityaffairs.co

    LEARN MORE

    QUICK LINKS

    • Home
    • Cyber Crime
    • Cyber warfare
    • APT
    • Data Breach
    • Deep Web
    • Digital ID
    • Hacking
    • Hacktivism
    • Intelligence
    • Internet of Things
    • Laws and regulations
    • Malware
    • Mobile
    • Reports
    • Security
    • Social Networks
    • Terrorism
    • ICS-SCADA
    • POLICIES
    • Contact me

    Copyright@securityaffairs 2024

    We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit "Cookie Settings" to provide a controlled consent.
    Cookie SettingsAccept All
    Manage consent

    Privacy Overview

    This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities...
    Necessary
    Always Enabled
    Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
    Non-necessary
    Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
    SAVE & ACCEPT