Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 316f0cf74034be6d…

MALICIOUS

Office (OOXML)

136.2 KB Created: 2021-05-15 11:12:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2021-05-22
MD5: bbf94aa366a59fad9917c69ae5ba679a SHA-1: 376a2f06567dd9cab64bcfc2bfca86c196030690 SHA-256: 316f0cf74034be6d16ab1e07833fbd7df64fc7da410e00007f954d9eaaf69df6
204 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with multiple signatures indicating it's a dropper or phishing lure. Heuristics indicate the presence of an embedded OLE object containing an executable payload, likely exploiting CVE-2026-21514. The embedded URLs, though benign in reputation, are associated with the OLE object, suggesting a potential download or execution mechanism.

Heuristics 5

  • 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
  • Payload URL recovered from embedded OLE object (4 URLs) info OOXML_EMBEDDED_OBJECT_URL
    An embedded OLE object (xl/word/ppt embeddings) carries a next-stage download URL in its Ole10Native/Package stream — stored literally (incl. UTF-16) or base64-encoded — which the package-level URL sweep does not see. Surfaced as an IOC; self-validating (only real payload hosts).
  • 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://tempuri.org/ In document text (OOXML body / shared strings)
    • http://tempuri.org/ActivateIn document text (OOXML body / shared strings)
    • http://tempuri.org/TIn document text (OOXML body / shared strings)
    • http://tempuri.org/TUIn document text (OOXML body / shared strings)
    • http://tempuri.org/TU��System.Web.Services.Description.SoapBindingUseIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn 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 265216 bytes
SHA-256: 681228a2ccceef05baeca3815b9248b2ce79865e7966482e3e20bc186e99600c
Detection
ClamAV: Win.Dropper.LimeRAT-9776087-0
Obfuscation or payload: unlikely
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 260396 bytes
SHA-256: d3ad81b20148ec36a88b6ece2ca0340794af35bfc02cd2e8861bb11976ede0a0
Detection
ClamAV: Win.Dropper.LimeRAT-9776087-0
Obfuscation or payload: unlikely
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5320 bytes
SHA-256: efc9b60b3e426d39505784fe8a10f191c5055bd24588b2e7a73fdb3cc4061a6c
Detection
ClamAV: Img.Dropper.PhishingLure-6329861-0
Obfuscation or payload: unlikely

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