Office (OOXML) / .XLSX malware analysis — malicious · 4a1e40508379562e

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 71e83cfe190375b478e42933ac4e1997 SHA-1: bd4ce42a4599837b7a819e41ab740881f2f9bbd1 SHA-256: 4a1e40508379562e5cfe14681fc7f17d647b158f00a1cdef8eb3f6d2e0f423a0

100 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is an Excel file 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 and a large declared inner size, strongly suggesting exploitation. This technique is commonly used to deliver secondary malware payloads.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Fb92NOU.C1Tr72Q 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` `1bf50aa0ffb9a2376091b9032a73a2ad6640e766f193dd6e58fceb6f7ca76d4e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Fb92NOU.C1Tr72Q	961536 bytes
`ooxml_oleobject_00_ole10native_00.bin` `e06f38df0243eb1d8cd80c677cfc5de85fa5940493aba15e6316b851b302811b`	ole-package	OOXML xl/embeddings/Fb92NOU.C1Tr72Q Ole10Native stream: olE10NAtIVE	951406 bytes

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