Office (OOXML) / .XLSX malware analysis — malicious · 0af2f2665c432148

MALICIOUS

Office (OOXML) / .XLSX

746.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-30

MD5: 1aebaa9d4da0b0d83c03732df110b8ea SHA-1: 6b90d52ea63c25e1d3a3f2d4a1074f891925b0b7 SHA-256: 0af2f2665c432148f84c51a1d561156e8f5c5440728da53bd963315589881513

100 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity 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 of a vulnerability like CVE-2017-11882. This indicates the document is designed to exploit this vulnerability to execute a secondary payload.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/NpSVkHa.dsGlXl3 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` `7a6ad6dcbf0093be5395281079a21a2ea91e17d7c79dde28acbcb6babcb0235e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/NpSVkHa.dsGlXl3	1026560 bytes
`ooxml_oleobject_00_ole10native_00.bin` `b8e3866237fb524b2a5151166e3214845a52ae5a75c904415d769108d85917ae`	ole-package	OOXML xl/embeddings/NpSVkHa.dsGlXl3 Ole10Native stream: OLe10natiVe	1016287 bytes

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