Nanocore — Office (OOXML) / .DOC malware analysis

Static analysis result for SHA-256 1d3afc7afcabda75…

MALICIOUS

Office (OOXML) / .DOC

436.4 KB Created: 2022-01-14 15:13:00 UTC Authoring application: Microsoft Office Word 15.0000
MD5: ccd5a9e218268a76be6043408f5afeec SHA-1: 836c02a99ec0e7bc04e2dedc9b5523db05801c61 SHA-256: 1d3afc7afcabda756a933e32bab62f00239cbd952d739dc0c5df3c31fb23adea
224 Risk Score

Malware Insights

Nanocore · confidence 95%

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Win.Dropper.Nanocore-10023724-0. Static analysis indicates the presence of an embedded OLE object containing an executable file, strongly suggesting exploitation of CVE-2026-21514. This points to a delivery mechanism designed to trick users into opening a malicious attachment, leading to the execution of the Nanocore dropper.

Heuristics 7

  • 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-10023724-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Nanocore-10023724-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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
  • 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
    • 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/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.

FilenameKindSourceSize
ooxml_oleobject_00.bin
36d45f0442f3037e20ebf9b085beffaba8e9f0a4cd0ab893b61d343d54a1f4fd		 ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 475648 bytes
Detection
ClamAV: Win.Dropper.Nanocore-10023724-0
Obfuscation or payload: likely
Carved artifact entropy is 7.88, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin
b3213c97b9f22f481a549cb100d1b3889d463090c336ca6224f515c07c316a62		 ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 469382 bytes
Detection
ClamAV: Win.Dropper.Nanocore-10023724-0
Obfuscation or payload: likely
Carved artifact entropy is 7.90, consistent with packed or encrypted content.
emf_00.emf
e3e49b6f794d6d54064ae1a1550cfb152daff946c5a8485958c140af217e6401		 ooxml-emf OOXML EMF part: word/media/image1.emf 5272 bytes

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