Krasimir Konov

Sucuri Blog

During malware analysis, we regularly find variations of this injected script on various compromised websites: . The variable “_0x446d” assigns hex encoded strings in different positions in the array. If we get the ASCII representation of the variable, we’ll end up with the following code: var _0x446d=["_mauthtoken","indexOf","cookie","userAgent","vendor","opera","hxxps://zeep.ly/ev4Va","googlebot","test","substr","getTime","_mauthtoken=1; path=/;expires=","toUTCString","location"]; In this ... Read More

A large majority of the malware we find on compromised websites are backdoors that allow an attacker to maintain unauthorized access to the site and execute whatever commands they want. Another common scenario includes malware which is directly injected into a website’s files and used to redirect traffic, steal credit ... Read More

Malicious pop-ups and redirects have become two extremely common techniques used by attackers to drive traffic wherever they want. During a recent investigation, we came across an obfuscated pop-up script leveraging baidu[.]com search results to redirect users to the attacker’s own domain. Below is the encoded JavaScript: Once decoded, the ... Read More

Our team recently came across a malicious script used on a Magento website titled gstaticapi, which targeted checkout processes to capture and exfiltrate stolen information. To obtain sensitive details, the malware loads external javascript whenever the URL contains “checkout” ⁠— this location typically belongs to the step in Magento’s checkout ... Read More

Short scripts that deliver malware to a website are nothing new, but during a recent investigation we found a script using hastebin[.]com, which is a domain we see used infrequently. The script was found writing malicious contents into an image directory on a compromised website, allowing an attacker to execute ... Read More

Initially released December 2015, PHP 7 introduced a multitude of performance and security improvements. Approximately 43.7% of websites across the web currently use PHP 7.x, making it an incredibly popular scripting language — which is likely why attackers are creating malware to target environments which leverage it. During a recent ... Read More

Our team recently stumbled across an interesting example of malicious code used to add an arbitrary user inside WordPress. The following code was detected at the bottom of the theme’s functions.php. It uses internal WordPress functions like wp_create_user() and add_role() to create a new user and elevate its role to ... Read More

During a website remediation, we recently discovered a new version of a Magento credit card stealer which sends all compromised data to the malicious domain cdn-filestore[dot]com. My colleague Luke Leal originally wrote about this malware in a blog post earlier this year. Malware Evolution & Evasive Techniques One primary difference ... Read More

While string concatenation has many valuable applications in development — such as making code more efficient or functions more effective — it is also a popular way for attackers to obfuscate code and try to make it more difficult to detect. Let’s dig into how bad actors are leveraging this ... Read More

We recently found a simple malicious script leveraging Magento’s internal functions to create a new admin user with the admin role “Inchoo” ⁠— probably referring to a Croatian Magento consulting company. The script is simple but very effective and can easily be overlooked as another Magento file without closer inspection ... Read More