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

Static analysis result for SHA-256 3e09d65406ad330a…

MALICIOUS

Office (OOXML) / .XLSX

639.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-07-05
MD5: b90911933149c31f74db82f98826d6fb SHA-1: 8634e2c8e02a6870d840003bb68df093768c2fd2 SHA-256: 3e09d65406ad330a17be1198244b0cd386025c541054c25c7ef7bb75b25f3b0d
100 Risk Score

Malware Insights

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

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft 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 designed to exploit a vulnerability. This points to an attack pattern focused on exploiting the Equation Editor component to execute arbitrary code or deliver a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/VoD.mvD4YM 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
06230557b6e594129f1aab5180441b2c2859f7c985beded89fdc107dffe9ba76		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/VoD.mvD4YM 933376 bytes
ooxml_oleobject_00_ole10native_00.bin
0cfeb3aaf394bac0747fd3ed2e70495658e86dc4f4a7690df425a7273fb6b4b8		 ole-package OOXML xl/embeddings/VoD.mvD4YM Ole10Native stream: oLe10nAtIVE 923260 bytes

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