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

Static analysis result for SHA-256 db20f545ef1d627c…

MALICIOUS

Office (OOXML) / .XLSX

711.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-02
MD5: c6aea4cec9c314bb2751af18e0e7918d SHA-1: 64172b82ef9bcaf9d9784858017716270a964005 SHA-256: db20f545ef1d627c0cd064e81063d198cdd8a39bd02b1cb19e1144837fade432
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 an Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to execute malicious code. The document body, formatted as a purchase order, serves as a lure to encourage interaction with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/FL1.p6VTF 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
a5115ce0e1a369da6ed81fcf19a4119d8add7889a713d4a2122a49660d67a3d7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/FL1.p6VTF 1028096 bytes
ooxml_oleobject_00_ole10native_00.bin
16174691918ce5e61964c317049b9089ba1b26a23f1f72d6b299dfbe7b41a05a		 ole-package OOXML xl/embeddings/FL1.p6VTF Ole10Native stream: ole10naTiVe 1017815 bytes

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