Office (OOXML) / .XLSX malware analysis — malicious · c08e15f52ad361c1

MALICIOUS

Office (OOXML) / .XLSX

673.0 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-16

MD5: 6d320ec6a0b2de03e9583aebf2332a12 SHA-1: c98237befccdfdfeb189c9714cabdac27caa5065 SHA-256: c08e15f52ad361c1f7d425e4348980ed31a5e67d6253371e871d51b930736f96

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 identified as an Equation Editor object. The heuristic OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY indicates that this object carries a payload-like stream with an anomalous header and size discrepancy, strongly suggesting malicious intent. This technique is often used to exploit vulnerabilities or deliver secondary malware stages.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/7ShvLw3.276 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.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `d7d6f560e394588f54fc659eb18aff766b082d1c39cde749a5c66971693aafc0`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/7ShvLw3.276	916480 bytes
`ooxml_oleobject_00_ole10native_00.bin` `ce99fab628207cf0e36b5c75007249da24836f41d2fb7f86bc42516642ce63f8`	ole-package	OOXML xl/embeddings/7ShvLw3.276 Ole10Native stream: olE10NaTiVe	907120 bytes

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