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

Static analysis result for SHA-256 2e045bfe973e2c4e…

MALICIOUS

Office (OOXML) / .XLSX

661.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-10
MD5: 5ce2593dd2633a16b59f24f89b59a771 SHA-1: 8453e8c8e92329d9f1c17b1006b88404fafb460a SHA-256: 2e045bfe973e2c4e23ea48dd72e22e92c422b8a9c5dd0d4dcd8bb2d22213f439
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 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 exploitation of 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/BK.Kf 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
f7d51be7b8f9999302094bada7a4abaf959dcf0ee6ca12a8f737c094763a74ea		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/BK.Kf 943616 bytes
ooxml_oleobject_00_ole10native_00.bin
e8180dca402d1739bdbc3b9adafd4a3ea17b6e275332234288fea0f2aa2712fa		 ole-package OOXML xl/embeddings/BK.Kf Ole10Native stream: OlE10nAtive 933638 bytes

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