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

Static analysis result for SHA-256 f8873a0341c0dee1…

MALICIOUS

Office (OOXML) / .XLSX

687.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-20
MD5: d182a2ca11f1a28fbdc2b33ab14106e4 SHA-1: 5313a10808f6317ffa4355c04864322a82696f01 SHA-256: f8873a0341c0dee11ac5135fce48e525973e04313be5a54e5ef296e886ccc180
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an 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.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Yga.Qg6QAS 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
40d0ff038a0d89dd86a6f8ae8e2869efabe98583326de3fa6e8ca55d06175f02		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Yga.Qg6QAS 951808 bytes
ooxml_oleobject_00_ole10native_00.bin
c6361a1fd2cca4c8358cc652a4e97fff8939b555d3f0dddf394659f31f48c79b		 ole-package OOXML xl/embeddings/Yga.Qg6QAS Ole10Native stream: OLE10NatIVE 941967 bytes

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