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

Static analysis result for SHA-256 6599da7968ef7442…

MALICIOUS

Office (OOXML) / .XLSX

716.7 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-07
MD5: e52858bd51bffc6fea3d9940cae8b7b3 SHA-1: 977850d06b75b2b0d613d449d166521a996e53b9 SHA-256: 6599da7968ef74428e7187b46b393a72e7595b691d8f83c3fb12a2800f0f541a
100 Risk Score

Malware Insights

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

The XLSX 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 and entropy, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for malicious documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/H5tE.jhqzhK 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
26cd3be4210c7ad81bd065b9f63a0da2ec030e38853eae57b2f202ae69aaac27		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/H5tE.jhqzhK 995328 bytes
ooxml_oleobject_00_ole10native_00.bin
4332a5fe0913b65de5283e31e499a1193df7f4c02b60ba7fb62ebbd637cd6398		 ole-package OOXML xl/embeddings/H5tE.jhqzhK Ole10Native stream: oLE10naTiVe 984712 bytes

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