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

Static analysis result for SHA-256 7ce23a3edcd1d653…

MALICIOUS

Office (OOXML) / .XLSX

726.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-15
MD5: af3ef4e4457e9638c6bb8b6765f600bd SHA-1: 30057d1801bac2ad3482fed5bd1765581c2c5c7c SHA-256: 7ce23a3edcd1d653c0a9fc592c139b8a642ef408a04cf4f59e1f0650d744dabb
100 Risk Score

Malware Insights

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

The file contains a high-severity heuristic indicating an embedded OLE object, specifically an Equation Editor object, which carries a payload-like Ole10Native stream. This suggests the object is designed to exploit vulnerabilities or deliver malicious content. The document body is formatted as a purchase order, serving 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/k1kPbVR.vWjVi 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
b5372406455dcc6d41a1e107ef44f815d63d8e25ad78e9569c78a09d9a68c0a0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/k1kPbVR.vWjVi 1016832 bytes
ooxml_oleobject_00_ole10native_00.bin
675ceb3f6e1eb9438f5cdf9bb8ec057a44e78dc56caa85acbc0a1c94efccf0b1		 ole-package OOXML xl/embeddings/k1kPbVR.vWjVi Ole10Native stream: OLe10naTiVe 1006093 bytes

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