Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e4d8e5269c2705a7…

MALICIOUS

Office (OOXML)

696.2 KB Created: 2018-04-04 05:15:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2018-06-21
MD5: 6f9536cd0b794415760566ce16af44ef SHA-1: c2f7fd9cd68c82e043f6b6416ae63cb2ce20b9e1 SHA-256: e4d8e5269c2705a7bfd67f228a922d9e8ab319fbfb406d4ca8d50113dab96d90
202 Risk Score

Malware Insights

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

The sample contains an embedded OLE object with indicators of a dropped executable payload, strongly suggesting exploitation of a vulnerability like CVE-2026-21514. ClamAV detections further confirm its malicious nature as a dropper for phishing lures. The embedded OLE object and its native payload are the primary IOCs.

Heuristics 4

  • ClamAV: Win.Dropper.Autoit-6667050-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Autoit-6667050-0
  • 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
  • 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 2618880 bytes
SHA-256: 6d723f7debf0929522285df97a5347a62233e15de8c672918ba76a9fbd9381ae
Detection
ClamAV: Win.Dropper.Autoit-6667050-0
Obfuscation or payload: unlikely
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2595962 bytes
SHA-256: 73575b016cd66f11b458c3f461444e682358640eea02b3dc2b317c879495c699
Detection
ClamAV: Win.Dropper.Autoit-6667050-0
Obfuscation or payload: unlikely
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5216 bytes
SHA-256: 7827a67d6343f0adcbffdd17c824dead1653b47029183e5b5f9c6778a53d73b5

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