Office (OOXML) / .XLSX malware analysis — malicious · 3a6b50f884150806

MALICIOUS

Office (OOXML) / .XLSX

669.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-16

MD5: 01ab5943426b36292f33646692ebcd92 SHA-1: 12b8266c5ed9f3958b13f47eb98c5d695ee3a3b0 SHA-256: 3a6b50f884150806505bd1972ae11b09bce9f524e9ace0c3e8d8e91a0e5a16cf

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The XLSX file contains 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 size and entropy, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique is commonly used to deliver a second-stage malicious payload.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/sp6J.EtEv 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` `0d7568916c0bbd65a30dc788961128cf0b53d27dbabfb4f2d8adbbaed08bd256`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/sp6J.EtEv	989184 bytes
`ooxml_oleobject_00_ole10native_00.bin` `293007769c223fdf5ba88c038f9662ea8a5c8a6b00061ef2bcf4a7f6a3b64149`	ole-package	OOXML xl/embeddings/sp6J.EtEv Ole10Native stream: oLE10NaTIVe	978665 bytes

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