Office (OOXML) / .DOC malware analysis — malicious · 7ff9891f4cfe8412

MALICIOUS

Office (OOXML) / .DOC

418.3 KB Created: 2022-01-10 12:37:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2022-04-09

MD5: bfc36f03b9752ca9d49ffb4d259129ad SHA-1: 0321fbe3b8a574b224c9dabdb69ca40369aa8dca SHA-256: 7ff9891f4cfe841233b1e0669c83de4938ce68ffae43afab51d0015c20515f7b

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document contains an embedded OLE object with indicators for a payload, specifically noting an HTA file. This strongly suggests an attempt to exploit a vulnerability like CVE-2026-21514 to execute arbitrary code. The embedded OLE object and its native package are the primary indicators of this malicious behavior, likely leading to the execution of a second-stage 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.
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
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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
- http://schemas.microsoft.com/office/drawing/2014/chartex
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/officeDocument/2006/math
- http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
- http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
- http://schemas.openxmlformats.org/wordprocessingml/2006/main
- http://schemas.microsoft.com/office/word/2010/wordml
- http://schemas.microsoft.com/office/word/2012/wordml
- http://schemas.microsoft.com/office/word/2015/wordml/symex
- http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
- http://schemas.microsoft.com/office/word/2010/wordprocessingInk
- http://schemas.microsoft.com/office/word/2006/wordml
- http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `2c6a0c43e13abdc5da8ef74c577ad5f98db9c4dd8441d4836412f9011c5ca612`	ooxml-ole-object	OOXML embedded OLE part: word/embeddings/oleObject1.bin	687616 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 shell/COM execution token(s).
`ooxml_oleobject_00_ole10native_00.bin` `f875c9ff3c7327d93f616fc0889713ee153c198de509b1764034d5f537c4948c`	ole-package	OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native	679917 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 shell/COM execution token(s).
`emf_00.emf` `c6f6e8165a97c761855d718113c8312a6e90092ad0ac4109351ddc26a73e4e30`	ooxml-emf	OOXML EMF part: word/media/image2.emf	5440 bytes

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