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

Static analysis result for SHA-256 aed6f0a075246fe3…

MALICIOUS

Office (OOXML) / .XLSX

658.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-29
MD5: 483a2d11ff94f00a6bdc68f73bd6d4e6 SHA-1: 0d98180334daefea985946b49dbccbbea6fc3410 SHA-256: aed6f0a075246fe3781196b85c45c6a4a97b596e03ae098d0fde88192e67b887
100 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to execute malicious code. The document body presents a fake purchase order, likely a lure to encourage the user to interact with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5hadaqUF5.4xqzoT 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
998b7d4b763d3e8aa0b9611a704a5731ca7dc36c684b8268903ff5788d92c165		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5hadaqUF5.4xqzoT 887808 bytes
ooxml_oleobject_00_ole10native_00.bin
fb862b8812fe8bb0a8752a059d2d36bde830a9092d96b920df0a8f412e48637d		 ole-package OOXML xl/embeddings/5hadaqUF5.4xqzoT Ole10Native stream: oLE10natIVe 878365 bytes

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