Office (OOXML) / .XLSX malware analysis — malicious · 41f22c4ad7d2fc57

MALICIOUS

Office (OOXML) / .XLSX

683.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-07-07

MD5: d7f61bd6e36e393b5a30694dfe30c6a5 SHA-1: 62d4e4205b575b3d228543bd593b6f078f125035 SHA-256: 41f22c4ad7d2fc57fdc6380048301805bc6c92426a927bff696f2389189aee5d

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 vulnerable Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. The large declared inner size compared to the stream size further supports this, indicating a potential buffer overflow or similar exploit. No scripts were extracted, but the presence of the vulnerable OLE object strongly points to an exploit delivery mechanism.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/4KrH8gO.8I0 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` `5ffb04e6acdf9df3f943fc1a2d76bd586b168ff5001f7e37468f80a39753452d`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/4KrH8gO.8I0	980992 bytes
`ooxml_oleobject_00_ole10native_00.bin` `ed4948e1c3d816fe026f7f6d214ef63bad7f706d5fc402f06001d342445a355f`	ole-package	OOXML xl/embeddings/4KrH8gO.8I0 Ole10Native stream: OLE10NATiVE	971199 bytes

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