Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 a9f3d2f7e0582569…

MALICIOUS

Office (OOXML) / .XLSX

15.1 KB Created: 2023-03-13 06:58:13 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-03-16
MD5: 5e5c6ce920e3169b469cdee0985b31cf SHA-1: 7660ee54035605700b6fe6678aa66f6bc477e1e0 SHA-256: a9f3d2f7e0582569a46b211aaaa2158c0e41473ac7cb55f2194912450d39f9da
100 Risk Score

Malware Insights

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of a vulnerability related to CVE-2018-0798 within this object, suggesting an attempt to exploit this known vulnerability. The document body appears to be a product order, likely a lure to entice the user to open the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
07c217286d776c238e23ed991d41843a4d2ee4954633812ba4207c6bc94a3791		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
d55a24ff7c9453539cdf4f9a9ae1efc1d09da2e47f0eab286ee9b79b058e2d05		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NatIVe 1898 bytes

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