Anomali Cyber Watch: Microsoft Office SharePoint Servers Targeted with Ransomware, New Commodity Crypto-Stealer and RAT, Linux Backdoor Targeting Users for Years, and More

The various threat intelligence stories in this iteration of the Anomali Cyber Watch discuss the following topics: Data Theft, Backdoor, Ransomware, Targeted Ransomware Attacks and Vulnerabilities. The IOCs related to these stories are attached to Anomali Cyber Watch and can be used to check your logs for potential malicious activity.

Figure 1 - IOC Summary Charts. These charts summarize the IOCs attached to this magazine and provide a glimpse of the threats discussed.

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Python Also Impacted by Critical IP Address Validation Vulnerability

(published: May 1, 2021)

Researchers have recently discovered that a bug previously discovered in netmask (a tool to assist with IP address scoping) is also present in recent versions of Python 3. The bug involves the handling of leading zeroes in decimal represented IP addresses. Instead of interpreting these as octal notation as specified in the standard, the python ipaddress library strips these and interprets the initial zero and interprets the rest as a decimal. This could allow unauthenticated remote attackers to perform a number of attacks against programs that rely on python's stdlib ipdaddress library, including Server-Side Request Forgery (SSRF), Remote File Inclusion (RFI), and Local File Inclusion (LFI).Analyst Comment: Best practices for developers include input validation and sanitization, which in this case would avoid this bug by validating or rejecting IP addresses. Additionally regular patch and update schedules will allow for rapid addressing of bugs as they are discovered and patches delivered. Proper network monitoring and policies are also an important part of protecting against these types of attacks.Tags: CVE-2021-29921, python