Office (OOXML) / .XLSX malware analysis — malicious · bed210e24eb758d5

MALICIOUS

Office (OOXML) / .XLSX

791.6 KB Created: 2020-07-07 21:52:29 UTC Authoring application: Microsoft Excel 16.0300

MD5: a97addc2c3a59209730d160b0c618a17 SHA-1: 413e6c256e7020e8a2e4b42f577918992c93c107 SHA-256: bed210e24eb758d50ba57a168b84963a22f7e96161bb81d2f859dbc25dbcaa1e

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an Office Open XML 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 size difference, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882). This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin 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` `cf5913efec40127c3a2debf790be6d6c5f7eedc39d228dd2a9902afb002c265d`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	937984 bytes
`ooxml_oleobject_00_ole10native_00.bin` `2747f27c58c660822e52eb137ed9aa20924c794467641c827729eec4e8dfe1dd`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NaTIvE	927855 bytes

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