Office (OOXML) / .XLSX malware analysis — malicious · 7f963762e0a5ab39

MALICIOUS

Office (OOXML) / .XLSX

740.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-19

MD5: 4b054b446201881a584d41cf7c9e4680 SHA-1: 9baa1896456aa1ceb25ab1e5bc8ea5d8490efafe SHA-256: 7f963762e0a5ab3972310b33f67a123ba3607338da8d1a5426e42dd8f2aca9d6

100 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation. This technique is commonly used to deliver second-stage malware.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/yL9y4Vj.2JH 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` `3183dfa2a1c7dc2778b182b1fd3f02337f36d50aab0ab50a7358969a8df9d1ed`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/yL9y4Vj.2JH	992256 bytes
`ooxml_oleobject_00_ole10native_00.bin` `1df7d1c8b584d127ce9e3f79616a061ffdc7db9571cc58af644340c0a199a18b`	ole-package	OOXML xl/embeddings/yL9y4Vj.2JH Ole10Native stream: olE10nATiVE	981668 bytes

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