Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e486cc2cda1824f2…

MALICIOUS

Office (OOXML)

155.4 KB Authoring application: Spire.Doc 14.0000 First seen: 2021-05-29
MD5: af183901b2c1f09f31ea9967920ff336 SHA-1: 0835e47749260d87c202a6192c8a29c53f57bad5 SHA-256: e486cc2cda1824f2828faa72d578e520ae5dd9e2f5c3d813dae835e3916d6805
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1127.001 Trusted Developer Utilities: Module Load

The file is an OOXML document identified as malicious by ClamAV with the signature 'Doc.Dropper.Agent-6489757-0'. Heuristics indicate the presence of an embedded OLE object containing an executable payload, strongly suggesting exploitation of CVE-2026-21514. This dropper likely facilitates the execution of a second-stage malware.

Heuristics 6

  • OOXML Ole10Native with payload/link indicators — possible CVE-2026-21514 high CVE likely CVE_2026_21514
    Office document contains embedded OLE (word/embeddings/oleObject3.bin) with Ole10Native plus executable, PE, or risky remote-link indicators. This is a likely CVE-2026-21514 exploitation shape.
  • ClamAV: Doc.Dropper.Agent-6489757-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6489757-0
  • 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.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.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/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/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: word/embeddings/oleObject3.bin 169984 bytes
SHA-256: 68b5ce6e4abec2bf9b754560171234c26d30762b093e187142b17452f99f5fa6
Detection
ClamAV: Doc.Dropper.Agent-6489757-0
Obfuscation or payload: likely
Carved artifact entropy is 7.62, consistent with packed or encrypted content.
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject3.bin Ole10Native stream: Ole10Native 165519 bytes
SHA-256: 2bcec898a63ef0b71b433bc3f069b09ab4ec7da4e77fb40fb1b228050b93bd35
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.69, consistent with packed or encrypted content.

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