Win.Dropper.Nanocore-10024721-0 — Office (OOXML) malware analysis

Static analysis result for SHA-256 f55e71ae96b4e9a8…

MALICIOUS

Office (OOXML)

233.2 KB Created: 2020-05-18 18:03:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-07-02
MD5: cf9c51489e385750f46538ce643e9bcd SHA-1: b79ce099cb3a3f084088494e0819987a20d0db16 SHA-256: f55e71ae96b4e9a85a4dfbaaa114cc9914e21894e1a3935ac3ecf67c80149e67
204 Risk Score

Malware Insights

Win.Dropper.Nanocore-10024721-0 · confidence 95%

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

The file is identified as malicious by ClamAV with the signature Win.Dropper.Nanocore-10024721-0. Static analysis revealed an embedded OLE object which is flagged as a risky file type capable of dropping an auto-executable payload, specifically an .exe file. This indicates the document is likely a delivery mechanism for a secondary malicious executable.

Heuristics 5

  • ClamAV: Win.Dropper.Nanocore-10024721-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Nanocore-10024721-0
  • 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.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn 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/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn 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 294353 bytes
SHA-256: c27697b57b188fb7222fe6e0826ead32b9ef55480a6b18e5e84a1e9ac9409a68
Detection
ClamAV: Win.Dropper.Nanocore-10024721-0
Obfuscation or payload: unlikely
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 289745 bytes
SHA-256: 8af7b21bfc3f7318bf3c771784de4bd6015430ac044eed738f8fccb774fd1828
Detection
ClamAV: Win.Dropper.Nanocore-10024721-0
Obfuscation or payload: likely
Carved artifact entropy is 7.41, consistent with packed or encrypted content.
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5228 bytes
SHA-256: 9380c3530e7bcc8e2514f91585c63a907765e22e5cfecc4fc0fe6af02e821a5e

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