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

Static analysis result for SHA-256 665ed6ba4d710d17…

MALICIOUS

Office (OOXML) / .XLSX

650.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-01
MD5: 8cba61010cab5c6acf52c16a42ebe84e SHA-1: 9ec304f06c21d9c7c008623d98684bcc7047d46d SHA-256: 665ed6ba4d710d176ff7c3d42b178201490eadb9a7b85bd42cc6856be2515d4e
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 a high-severity OLE object, specifically an Equation Editor object. Heuristics indicate an anomaly where the Equation Editor object carries a payload-like Ole10Native stream with an impossible header size, suggesting it's being used to deliver malicious content. The embedded OLE object is the primary indicator of malicious activity.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/TOBqkbq.a8FNVf3 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
6b7e4bacba33d79a4ae95c84db83b001777ec7ae5b0fd5d1f3fc8bc977c2f1da		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/TOBqkbq.a8FNVf3 897536 bytes
ooxml_oleobject_00_ole10native_00.bin
39172b70417458a6369520e8c393fff0b4ef7669736ee038685b7a70fb3200a4		 ole-package OOXML xl/embeddings/TOBqkbq.a8FNVf3 Ole10Native stream: olE10native 887853 bytes

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