Office (OOXML) malware analysis — malicious · ab7caf89a4dfaebb

MALICIOUS

Office (OOXML)

173.6 KB Created: 2021-11-08 13:41:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2021-11-23

MD5: fd9c4be1559b6575be55a6420694f5ce SHA-1: 1468296b0cdf6b213f01210f76f9b9ac72d396e9 SHA-256: ab7caf89a4dfaebb8d033dfab6ff85e9985f5a3d1774637e65862048e3551dfd

202 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious due to the presence of an embedded OLE object with indicators for a payload or link, strongly suggesting exploitation of CVE-2026-21514. ClamAV detections confirm the presence of a packed executable, Win.Packed.Razy-7660763-0, which is likely the dropped payload. The embedded OLE object is designed to execute this payload upon interaction.

Heuristics 4

ClamAV: Win.Packed.Razy-7660763-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Packed.Razy-7660763-0
Ole10Native package drops an auto-executable payload critical OFFICE_PACKAGE_RISKY_FILE

OLE Package displayName or fullPath ends in a directly auto-executable extension (a runnable binary or a script the default shell host runs on double-click). Embedding such a payload inside an Office document has no benign authoring use — it is a malware-delivery dropper.
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.openxmlformats.org/markup-compatibility/2006 In 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.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/2006/wordmlIn 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	239104 bytes
SHA-256: `6308edef0a3b0679af71a562e1a6da4db8853465456062f5a0478013f63a9fea`
Detection ClamAV: Win.Packed.Razy-7660763-0 Obfuscation or payload: unlikely
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	234922 bytes
SHA-256: `bb49b9062f2c5c5f58a11e4b10ba563143af032c590143814ed20dc8acf927a8`
Detection ClamAV: Win.Packed.Razy-7660763-0 Obfuscation or payload: unlikely
`emf_00.emf`	ooxml-emf	OOXML EMF part: word/media/image1.emf	5512 bytes
SHA-256: `546985d125e0bb735cd921a06d9603e85024c4d7e99d2d3d89f96b5353313afe`

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