Office (OOXML) / .XLSX malware analysis — malicious · 13777dc4be611dce

MALICIOUS

Office (OOXML) / .XLSX

2.15 MB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-07-17

MD5: 32b60170107b646e694e6b322f3ddc6f SHA-1: 935d09f9d863a4a991e64f7dbf1275f42a19abc1 SHA-256: 13777dc4be611dcebb4f08fb8240bf3bb1d76775b56901403957c5648703efa8

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet 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 discrepancy, strongly suggesting it is being used to exploit a vulnerability. 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/peohPt.zBnH 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` `842af18ab03d02d48866e33dc2044f0c4b2dd4fcfe09694ca044109a979abe03`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/peohPt.zBnH	3033600 bytes
`ooxml_oleobject_00_ole10native_00.bin` `672aa91e7e921eb002341eb8321d2c610253b6961c4fa1916770cb28576a070e`	ole-package	OOXML xl/embeddings/peohPt.zBnH Ole10Native stream: olE10naTiVE	3007125 bytes

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