Esvalabs Security Blog
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VBA has been introduced in Excel 5.0. Before then Excel only had XLM macros, which are still supported today. XLM macros allow writing code by entering statements directly into cells, just like normal formulas. In fact they are called macro-formulas. In case you are curious, the reference document of the Excel 4.0 macro functions is […]
One of Libraesva’s Security Researchers recently discovered, along with other security vendors, targeted phishing and whaling campaigns all based around the Coronavirus outbreak, we don’t believe in playing on the fear, but its always good to see how these attacks work and why they work. Figure 1 shows the email in question we received and […]
What exactly are Evasion Techniques? Evasion techniques are what malicious payloads use to avoid detection from Sandboxing services, Malware authors have two priorities when creating malware, being silent and being deadly, getting as much as they can for as little effort as possible. We thought it’d be wise to talk about how effective these evasion […]
We just discovered a new trick that is currently being used to slip malicious html files through email security solutions and, in some cases, through antivirus engines. The trick is quite simple: declaring an email entity as “application/html” instead of “text/html”. “application/html” is an invalid type and this allows it to slip through some checks. […]
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