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

Static analysis result for SHA-256 2817126c43337143…

MALICIOUS

Office (OOXML) / .XLSX

702.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-09
MD5: 12f72edd54ae8b574189ae3ab53fa36e SHA-1: 4585ae1c999e055236b9e6a796b10f8d505da470 SHA-256: 2817126c43337143465a9b198d5a0aefc098f01e53c2bea159c82e6978e8f5e0
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting exploitation of a vulnerability. The large declared inner size compared to the stream size further supports this. This points to a likely exploit delivery mechanism, common in targeted attacks.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/wQL83.mf7gi2 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
192547bac70148212f19df3f6bb3b90cdda15fe0af2902627b484f003b497231		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/wQL83.mf7gi2 934912 bytes
ooxml_oleobject_00_ole10native_00.bin
7f6c43baab21955e29d62808d5e0dad6c74d8c3daa670bf02f4a7bc197c1159f		 ole-package OOXML xl/embeddings/wQL83.mf7gi2 Ole10Native stream: OLE10nAtIVE 924813 bytes

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