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

Static analysis result for SHA-256 1d3af13724299c37…

MALICIOUS

Office (OOXML) / .XLSX

694.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-20
MD5: 33f13b1cfb529173106ac3d5faf247a2 SHA-1: 425a34056c0c756f666d383b4befb8aa12b849e7 SHA-256: 1d3af13724299c377941493a961676c35da6f70c36e6dea9d29fe8f10d5cd996
100 Risk Score

Malware Insights

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

The sample is an Excel file containing 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 header and a significantly larger declared inner size than the stream size, strongly suggesting exploitation. This technique is commonly used to deliver second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5T.HaTbE 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
ecb41ba703ba3ca0a07ad11b28a11428895e305503ca9072f05671e3b2a4fdf4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5T.HaTbE 925696 bytes
ooxml_oleobject_00_ole10native_00.bin
9f45578f899732cd762f8d8a31fa07393cf1567c5c204e3f9a70397fec5824b1		 ole-package OOXML xl/embeddings/5T.HaTbE Ole10Native stream: olE10NaTIvE 915760 bytes

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