Office (OOXML) / .XLSX malware analysis — malicious · c68dba24073e6ce1

MALICIOUS

Office (OOXML) / .XLSX

645.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-03-14

MD5: 07a172aa01306434cf68c83ff8971584 SHA-1: b431a194d01ae49cf9822f3779b0f5194edcbc87 SHA-256: c68dba24073e6ce12a4b38863235defff7c3b17514c919544fa8d095a3b88854

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file 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, suggesting it is being used to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated via spearphishing attachments.

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` `864adbf5b19b2915802753617feaa0686e1ba5ce6ded33e359abb9e756eab6f9`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	878080 bytes
`ooxml_oleobject_00_ole10native_00.bin` `30da31ede795d8edd1551c218df7c61db1b951ec8f47e7eac1c8a176c05dcfb8`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10naTivE	868521 bytes

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