Security Alerts & News
by Tymoteusz A. Góral

History
#1576 CryPy: ransomware behind Israeli lines
A Tweet posted recently by AVG researcher, Jakub Kroustek, suggested that a new ransomware, written entirely in Python, had been found in the wild, joining the emerging trend for Pysomwares such as the latest HolyCrypt, Fs0ciety Locker and others.

This Python executable comprises two main files. One is called boot_common.py and the other encryptor.py. The first is responsible for error-logging on Windows platforms, while the second, the encryptor, is the actual locker. Within the encryptor are a number of functions including two calls to the C&C server. The C&C is hidden behind a compromised web server located in Israel. The Israeli server was compromised using a known vulnerability in a content management system called Magento, which allowed the threat actors to upload a PHP shell script as well as additional files that assist them in streaming data from the ransomware to the C&C and back.

A notable point to mention is that the server was also used for phishing attacks, and contained Paypal phishing pages. There are strong indications that a Hebrew-speaking threat actor was behind these phishing attacks. The stolen Paypal credentials were forwarded to another remote server located in Mexico and which contains the same arbitrary file upload technique, only with a different content management.

It is a known practice for attackers to look for low-hanging fruit into which they can inject their code in order to hide their C&C server. One such example was the CTB-Locker for web servers reported last March.
#1575 Most businesses haven't inspected cloud services for malware
Echoing the findings we reported earlier that companies leave cloud protection to third-parties, a new study from cloud security company Netskope reveals most companies don't scan their cloud services for malware either.

The study conducted with the Ponemon Institute shows 48 percent of companies surveyed don't inspect the cloud for malware and 12 percent are unsure if they do or not. Of those that do inspect 57 percent of respondents say they found malware.
#1574 CSP Evaluator
CSP Evaluator allows developers and security experts to check if a Content Security Policy (CSP) serves as a strong mitigation against cross-site scripting attacks. It assists with the process of reviewing CSP policies, which is usually a manual task, and helps identify subtle CSP bypasses which undermine the value of a policy. CSP Evaluator checks are based on a large-scale study and are aimed to help developers to harden their CSP and improve the security of their applications. This tool (also available as a Chrome extension) is provided only for the convenience of developers and Google provides no guarantees or warranties for this tool.
#1573 AVTECH shuns security firm and leaves all products vulnerable without a patch
AVTECH, a Taiwanese CCTV equipment manufacturer, has failed to respond to Search-Lab, a Hungarian security firm that spent more than a year trying to inform the company about 14 security bugs affecting the firmware of all its products.

Almost a year after it first contacted the hardware maker, Search-Lab published a public advisory about the vulnerabilities it discovered, warning sysadmins that their AVTECH products may be in danger of exploitation.
#1572 Surge of email attacks using malicious WSF attachments
Symantec has seen a major increase in the number of email-based attacks using malicious Windows Script File (WSF) attachments over the past three months. Ransomware groups in particular have been employing this new tactic. In the past two weeks, Symantec has blocked a number of major campaigns distributing Locky (Ransom.Locky) which involved malicious WSF files.

WSF files are designed to allow a mix of scripting languages within a single file. They are opened and run by the Windows Script Host (WSH). Files with the .wsf extension are not automatically blocked by some email clients and can be launched like an executable file.
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