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

Static analysis result for SHA-256 99201b6c953c36b6…

MALICIOUS

Office (OOXML) / .XLSX

610.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-12
MD5: 6fc3fd9f1b832e3435d856577be09bd3 SHA-1: dd9e719a50bb3d738ba311144f6d2dd8810c0ac8 SHA-256: 99201b6c953c36b62d198db5769dfeb783aea1713f16aef8106f5e92a53e9477
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to deliver malicious content. The document body itself appears to be a business-related invoice, which is likely a lure to trick the user into opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/0OCMqVM.BtASx 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
2ecfa9f1dfd46a69c0ff329da436fb2fce591bed8d98ef928993cbc0705efcb1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/0OCMqVM.BtASx 839680 bytes
ooxml_oleobject_00_ole10native_00.bin
a8263b1cc08d4692d501f135de59ff16702d951742edfa0e17ec80c304d3c325		 ole-package OOXML xl/embeddings/0OCMqVM.BtASx Ole10Native stream: ole10NaTIVe 830530 bytes

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