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

Static analysis result for SHA-256 e6ecf390542c44da…

MALICIOUS

Office (OOXML) / .XLSX

726.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-11
MD5: e38bcfcd4aef15bb987399f787557582 SHA-1: d49c20bed98eabc5df26e5309572e2b946ca2189 SHA-256: e6ecf390542c44da68e56315d0aa3924239c5798fdc58bf7955b0e6b6613787d
100 Risk Score

Malware Insights

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

The sample is an OOXML file 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 and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation. This points to a likely attack pattern involving the exploitation of a vulnerability within the Equation Editor 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/936Zai.mokZ 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
db769cf320df668a752b836b4603b0babad42fbad8eef07e9314531e47847268		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/936Zai.mokZ 1036288 bytes
ooxml_oleobject_00_ole10native_00.bin
9bc62e5e7b493cbf09761e1e6c11855084fab510fcf2f77fe140b8d9facd62ee		 ole-package OOXML xl/embeddings/936Zai.mokZ Ole10Native stream: olE10NATIve 1025834 bytes

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