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

Static analysis result for SHA-256 4ccd31f4cb24cc07…

MALICIOUS

Office (OOXML) / .XLSX

708.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-08
MD5: 330a31dbd1a32fe2d6d93a232affdb6c SHA-1: 0ec90a4c5869e1bd31aa424fb06ce73897c1c4a6 SHA-256: 4ccd31f4cb24cc076927fe919c32456f8f5b012244e54b79d452dcd3c7faca4f
100 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor. Heuristics indicate that this Equation Editor object carries a payload-like stream with an anomalous size, strongly suggesting it's being used to exploit a vulnerability. The embedded OLE object and its anomalous stream are the primary indicators of malicious intent, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ykssbU.xltL 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
ec87f395999daf441f326dfb08a753d6eaf4f7420c6fc0516e576572598efacf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ykssbU.xltL 956416 bytes
ooxml_oleobject_00_ole10native_00.bin
8bc2b766f7fea8b7f47fd9e5495d9d82764f6c834c20c53b82d4511e884e3872		 ole-package OOXML xl/embeddings/ykssbU.xltL Ole10Native stream: OlE10NATiVE 946367 bytes

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