Office (OOXML) / .XLSX malware analysis — malicious · 319763c4253199fa

MALICIOUS

Office (OOXML) / .XLSX

605.6 KB Created: 2023-10-03 21:52:35 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-05

MD5: c4299323b25e15b75436b2d3b97a0377 SHA-1: b218643f49cdd92d34df9d92c5325c6bd4ee888c SHA-256: 319763c4253199fa108de1ced515b462bcf13fab283c69ad3bf5b62332fd3608

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample 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 size, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882) to execute arbitrary code. The embedded object's path and stream name are logged as IOCs.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/W8AxZgeKD.dJiEepe 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` `c35e596738c33c0c31755a00baad3220dff07b8f9cdf9dadba3cbd184f2a4337`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/W8AxZgeKD.dJiEepe	869376 bytes
`ooxml_oleobject_00_ole10native_00.bin` `96554c9d80e1b596432ce91f07c286069971f9411a5a67d7143c76b01cdcedfc`	ole-package	OOXML xl/embeddings/W8AxZgeKD.dJiEepe Ole10Native stream: oLE10NatIVE	860094 bytes

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