Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0888d8e0f76c3d56…

MALICIOUS

Office (OOXML)

750.4 KB Created: 2018-10-05 10:29:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2019-05-10
MD5: bc0261e29f283ff6999633e11845e05d SHA-1: 4e0087e52eaaa1f4aecc5e6a827b219a1d4a9ea6 SHA-256: 0888d8e0f76c3d5654d20d411fabc0c2640435b565817cdc50bc5753adab6bae
242 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 5

  • 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: Img.Dropper.PhishingLure-6329861-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Img.Dropper.PhishingLure-6329861-0
  • 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 2862080 bytes
SHA-256: db54b6a414f88755a598fb47e14036940ba75614c35a34d1f6e1826f028bc238
Detection
ClamAV: Win.Packed.Msilperseus-6894145-0
Obfuscation or payload: unlikely
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2837250 bytes
SHA-256: d672337a39d3521e9b250c9ac02baaa6266881cfd1b6f6ef7f6bb2239a2f5a48
Detection
ClamAV: Win.Packed.Msilperseus-6894145-0
Obfuscation or payload: unlikely
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5384 bytes
SHA-256: f1e8b6ffb809af3927a288e0233ae6becf7e4ba87eb1c0cd840a3ffc05f287d5
Detection
ClamAV: Img.Dropper.PhishingLure-6329861-0
Obfuscation or payload: unlikely

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