I published the following diary on isc.sans.org: “Cryptominer Delivered Though Compromized JavaScript File“: Yesterday I found an interesting compromised JavaScript file that contains extra code to perform crypto mining activities. It started with a customer’s IDS alerts on the following URL: hxxp://safeyourhealth[.]ru/wp-content/themes/wp-trustme/js/jquery.prettyphoto.js This website is not referenced as malicious and the
I published the following diary on isc.sans.org: “Malicious JavaScript Targeting Mobile Browsers“: A reader reported a suspicious piece of a Javascript code that was found on a website. In the meantime, the compromized website has been cleaned but it was running WordPress (again, I would say![1]). The code was obfuscated,
I published the following diary on isc.sans.org: “Malicious Post-Exploitation Batch File“: Here is another interesting file that I found while hunting. It is a malicious Windows batch file (.bat) which helps to exploit a freshly compromised system (or… to be used by a rogue user). I don’t have a lot of
I published the following diary on isc.sans.org: “Antivirus Evasion? Easy as 1,2,3“: For a while, ISC handlers have demonstrated several obfuscation techniques via our diaries. We always told you that attackers are trying to find new techniques to hide their content to not be flagged as malicious by antivirus products.
I published the following diary on isc.sans.org: “Malware Distributed via .slk Files“: Attackers are always trying to find new ways to infect computers by luring not only potential victims but also security controls like anti-virus products. Do you know what SYLK files are? SYmbolic LinK files (they use the .slk
I published the following diary on isc.sans.org: “Malicious Powershell Targeting UK Bank Customers”: I found a very interesting sample thanks to my hunting rules… It is a PowerShell script that was uploaded on VT for the first time on the 16th of May from UK. The current VT score is still
I published the following diary on isc.sans.org: “Nice Phishing Sample Delivering Trickbot“: Users have to deal with phishing for a very long time. Today, most of them remain dumb messages quickly redacted with a simple attached file and a message like “Click on me, it’s urgent!â€. Yesterday, I put my
I published the following diary on isc.sans.org: “Adding Persistence Via Scheduled Tasks“: Once a computer has been infected by a malware, one of the next steps to perform is to keep persistence. Usually, endpoints (workstations) are primary infection vectors due to the use made of it by people: they browse
The number of malicious documents generated every day keeps growing for a while. To produce this huge amount of files, the process must be automated. I found on Pastebin a Python script to generate malicious Office documents. Let’s have a look at it… [Read more]
I published the following diary on isc.sans.org: “Malicious Network Traffic From /bin/bash“: One of our readers from Germany sent me a malicious shell script captured by our honeypot running on his Raspberry. It’s a simple UNIX Bash script that performs a bunch of malicious tasks: Kills existing crypto miner processes
