Office (OOXML) malware analysis — malicious · 35a7f90c6ef51775

MALICIOUS

Office (OOXML)

463.7 KB Created: 2017-05-30 12:22:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2019-05-10

MD5: 1a6c18967f4ce1c91c77098af4957e6e SHA-1: f3e618542e7bd696263853f09164be9b1bce4c44 SHA-256: 35a7f90c6ef517756a3cef8c73ebb014d4483a5bf00f5382ead3ebe0e66ec78d

162 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is a malicious OOXML document containing an embedded OLE object with executable indicators, strongly suggesting exploitation of CVE-2026-21514. This technique is commonly used to deliver phishing or other malware. The ClamAV detection 'Win.Phishing.Suspicious-6355520-3' further supports a phishing-related payload.

Heuristics 5

OOXML Ole10Native with payload/link indicators — possible CVE-2026-21514 high CVE likely CVE_2026_21514

Office document contains embedded OLE (word/embeddings/oleObject1.bin) with Ole10Native plus executable, PE, or risky remote-link indicators. This is a likely CVE-2026-21514 exploitation shape.
ClamAV: Win.Phishing.Suspicious-6355520-3 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Phishing.Suspicious-6355520-3
Ole10Native package carries executable/script file type high OFFICE_PACKAGE_RISKY_FILE

OLE Package displayName or fullPath ends in an executable or script-capable extension. Even without UI extension spoofing, embedding a runnable payload inside an Office document is a high-risk delivery pattern.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin`	ooxml-ole-object	OOXML embedded OLE part: word/embeddings/oleObject1.bin	5632 bytes
SHA-256: `a448ce68dd06f7a34c9c211bb651e6f7025dcced27d3449ab84190b1ffc9620b`
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	3217 bytes
SHA-256: `3a0211835dab0bb21130575c0d6b8b503e829b7b1ecce00fa07333f23df250c7`
`emf_00.emf`	ooxml-emf	OOXML EMF part: word/media/image2.emf	5440 bytes
SHA-256: `0f369ecc971467d3072be736a4f62fab6b70534998d3aa11ad0722ad23af99b2`

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