Office (OOXML) / .XLSX malware analysis — malicious · 1f3b7f3ad8b73e19

MALICIOUS

Office (OOXML) / .XLSX

636.1 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-29

MD5: fd2c52c8a3fdfd8015400a1ec02b8648 SHA-1: dbeff047a9094f2e684802740cd88b4dec1b926d SHA-256: 1f3b7f3ad8b73e19d81f88cf2a6f78e99bb92d4192dc9e73ae5a571e42a2daea

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File T1137.003 DLL Search Order Hijacking

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to execute malicious code. The presence of an embedded OLE object and the anomalous payload structure strongly indicate a malicious intent to exploit vulnerabilities or deliver further malware.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oCwEG.XWQq4 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` `fae3d2caeb37d4b2ae88f024a14075091c676076c9a53d356b30de443d74fc09`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oCwEG.XWQq4	869376 bytes
`ooxml_oleobject_00_ole10native_00.bin` `03fc8195a0cc8d5dab2bde4539b1f85ed44bddc6ae56e133b8720444403bb0d0`	ole-package	OOXML xl/embeddings/oCwEG.XWQq4 Ole10Native stream: OLE10NAtivE	860074 bytes

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