Office (OOXML) / .XLSX malware analysis — malicious · 2b9f6f4188be4e91

MALICIOUS

Office (OOXML) / .XLSX

732.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-06-11

MD5: 1c42be537f30d0c0bdbbd4d5f798f2ce SHA-1: 96320942c51e7f3c9e25b1360d33d580205fd96c SHA-256: 2b9f6f4188be4e917dab5006debf6b95ce5a8ba69ef50c624a4a53419a488d69

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 structure, strongly suggesting exploitation of a vulnerability within the Equation Editor component. The embedded OLE object is the primary vector for delivering the malicious payload.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/sF352n.AiKb 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` `d210b81ffed0f6c26f8120dff5ab7e68a2e060518a75c0a743f4d7c443c580b8`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/sF352n.AiKb	980480 bytes
`ooxml_oleobject_00_ole10native_00.bin` `1452229ce1cd11e30f2a2d958eb3700762100cb691941a7e20c43640a2018528`	ole-package	OOXML xl/embeddings/sF352n.AiKb Ole10Native stream: olE10NAtIve	970588 bytes

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