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[Video] SolarWinds Compromise - A Nightmare for the CyberSec World

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A passionate Threat Researcher and a Cybersecurity enthusiast.

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Basic Security Measures You Should Follow

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Extracting Encoded Shellcode Out Of OLEStream

So I recently came across an interesting XLSX sample in the wild. After looking at the sample it seems like an innocent empty XLSX file roaming around. Digging it deeper reveals some interesting things about it. This sample is being propagated (using malware spam) with the name: RFQ-PO220523-supply order.xlsx 7ed0586b68a24bbe7cb29852beb48f2c6a625af46d2fbc3c652d552aa1b1bb5b Straightforward opening the XLSX gives you 3 sheets (all empty) as seen in the below screenshot, with no activity. (Fig. Empty Sheets) Anyways, let us go directly with the well-known oletools and get a much quicker view of what's going on behind the scenes. Using oledump on the file directly gives us some interesting results seen below. (Fig. oledump results) We can see that there is an OLEStream (\1Ole10Native) at A1 (or index 1) that we should definitely have a look at considering that's where the juicy stuff is all the times in such files. Let's dump this stream using the following command: oledump ...

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