Win.Dropper.Nanocore-10018817-0 — Office (OOXML) malware analysis

Static analysis result for SHA-256 7f2f2e4542dbb41c…

MALICIOUS

Office (OOXML)

402.9 KB Created: 2021-05-27 20:59:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2021-05-29
MD5: 8c3fc720b0f3493f87ce9db3e7afb2e6 SHA-1: f51cbcf361fdc5297b38368baede8739eda774dd SHA-256: 7f2f2e4542dbb41c1cc6c580d83eb9d43a71c58268a61d07d969ba1a702b4cbf
244 Risk Score

Malware Insights

Win.Dropper.Nanocore-10018817-0 · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious due to the presence of an embedded OLE object with Ole10Native indicators, strongly suggesting exploitation of CVE-2026-21514. ClamAV detection confirms this, identifying the payload as Win.Dropper.Nanocore-10018817-0. This indicates the document is designed to deliver and execute a secondary malicious payload.

Heuristics 6

  • 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.Dropper.Nanocore-10018817-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Nanocore-10018817-0
  • 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
  • Suspicious extracted artifact info 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 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.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 450048 bytes
SHA-256: b1c65145f80911b8b690c280a4d874caa28b9c37e1dd7e961aadc34768bcd9c5
Detection
ClamAV: Win.Dropper.Nanocore-10018817-0
Obfuscation or payload: likely
Carved artifact entropy is 7.83, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 444156 bytes
SHA-256: 078f4df3d8e168bc71d83e0ae9f8ccf005cca66c7406b103966479e43e41613f
Detection
ClamAV: Win.Dropper.Nanocore-10018817-0
Obfuscation or payload: likely
Carved artifact entropy is 7.85, consistent with packed or encrypted content.
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5336 bytes
SHA-256: 0c47e3124aa23b7b9be37874fee1d99b9ea650affb42ff686b4da51cfeea2042

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