Office (OOXML) / .XLSX malware analysis — malicious · e421b41a8f1c2d9c

MALICIOUS

Office (OOXML) / .XLSX

608.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-27

MD5: 8c45abf62a65da6e3c6f3679867ac5f6 SHA-1: 64304d587df206901bb53cb5da16c43d674c5de0 SHA-256: e421b41a8f1c2d9c8635590c4d1044b5e8848d737b1c735d738f19e4dd3efadc

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. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a vulnerability. This is a common technique for delivering secondary malware payloads.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/1dj7.bAynVz9 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` `656ecfa41d025fb27fc565d6382e17e75d2c5a5ef6126b0dc41475a04e0ddb7a`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/1dj7.bAynVz9	903680 bytes
`ooxml_oleobject_00_ole10native_00.bin` `06d2b17d53f574de91cea91a02a44b83fc41feb4b4f7a48776fc3cac9e0280cf`	ole-package	OOXML xl/embeddings/1dj7.bAynVz9 Ole10Native stream: Ole10nATive	894079 bytes

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