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

Static analysis result for SHA-256 088c9399f431e390…

MALICIOUS

Office (OOXML) / .XLSX

713.4 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-06
MD5: 9116a6f7f43c27b0ec325161588968a8 SHA-1: 33b8d97a4cc5fefe336097416f42b3dbf1f3489a SHA-256: 088c9399f431e3909c7e7be02328d9426f31beb235383f57fe5a85d0b12a57ea
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file contains an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/FqI.v8bndKL contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
f888d72c6d18ecc738d42d2e5deb0b007b206c337dd374cc34440b766270f343		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/FqI.v8bndKL 991232 bytes
ooxml_oleobject_00_ole10native_00.bin
e8824f7730a99284bded8a9a33283ff4d32aaaed729bbdb579d198174f760a50		 ole-package OOXML xl/embeddings/FqI.v8bndKL Ole10Native stream: olE10NATIve 980811 bytes

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