Win.Dropper.Nanocore-10021576-0 — Office (OOXML) / .DOC malware analysis

Static analysis result for SHA-256 cb017ce6dc04e1e4…

MALICIOUS

Office (OOXML) / .DOC

666.1 KB Created: 2021-02-26 09:30:00 UTC Authoring application: Microsoft Office Word 12.0000
MD5: 3dc72e85f57e26ef1291cff5762e7421 SHA-1: 8e1aad6dcf0bc1a0c512b5929b498b3415e4c1ae SHA-256: cb017ce6dc04e1e41fd22d455b43c2cb3171e804741bb42ba961957f8d2c6c7c
150 Risk Score

Malware Insights

Win.Dropper.Nanocore-10021576-0 · confidence 95%

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

The file contains an embedded OLE object, which is a common technique for delivering malicious payloads. The document body uses a fake invoice lure to trick the user into interacting with the embedded object. ClamAV detections confirm the presence of Win.Dropper.Nanocore-10021576-0, indicating the embedded object is likely a dropper for further malicious activity.

Heuristics 6

  • ClamAV: Win.Dropper.Nanocore-10021576-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Nanocore-10021576-0
  • 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.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2006/wordml

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
7ceb1bff83cc8899ca64ec41d7e8deb2ead5c7cb25c1b59c6a6b77090fbb6f26		 ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject1.bin 672768 bytes
Detection
ClamAV: Win.Dropper.Nanocore-10021576-0
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin
7fbbcbc15941aee00ebf624d7b4a98ee583a6de028346c7a419615e71e52cb0d		 ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 664822 bytes
Detection
ClamAV: Win.Dropper.Nanocore-10021576-0
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
emf_00.emf
e6ba2eee99c0baddcc9da17f05dece5aca1a0a291fc910335fb7c8ec6637d9c8		 ooxml-emf OOXML EMF part: word/media/image1.emf 5484 bytes

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