Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 94741536afe9cfd0…

MALICIOUS

Office (OOXML)

652.5 KB Created: 2021-09-01 13:51:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2021-09-17
MD5: 3524dcb633870edd73f137cbf56e22ab SHA-1: 6b2174c70dd92ab67b55faf543711be820cf8ea6 SHA-256: 94741536afe9cfd081f0983c7b1f4d1cb618185fdd008be6ac9d8e00f855431f
244 Risk Score

Malware Insights

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

The sample contains an embedded OLE object with indicators of a dropped executable payload, identified by ClamAV as Ole2.Macro.Agent-9858864-1. The document body prompts the user to open the embedded content, suggesting a spearphishing attachment vector. The embedded OLE object likely contains code to download and execute a second-stage payload from the URLs provided.

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/oleObject1.bin) with Ole10Native plus executable, PE, or risky remote-link indicators. This is a likely CVE-2026-21514 exploitation shape.
  • ClamAV: Ole2.Macro.Agent-9858864-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Ole2.Macro.Agent-9858864-1
  • 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 https://zealous-fire-94898.pktriot.net/handshake.php In document text (OOXML body / shared strings)
    • https://zealous-fire-94898.pktriot.net/alertmsg.zipIn 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/2006/wordmlIn document text (OOXML body / shared strings)
    • https://api.ipify.orgIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/SMI/2005/WindowsSettingsIn 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 1092608 bytes
SHA-256: 3ae757d4bebfa51a1363ddb88040a9150e76cc9420638086eb3ae9b455cf1303
Detection
ClamAV: Ole2.Macro.Agent-9858864-1
Obfuscation or payload: unlikely
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1081656 bytes
SHA-256: 348a946681221836e5305c7325f94e3304099d5aa3ce41397bffd425525316b2
emf_00.emf ooxml-emf OOXML EMF part: word/media/image1.emf 5448 bytes
SHA-256: 9334857f54d01cecdce1740f8c66dd4724f664c3f89e6e371847e25b0799e797