Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 627dd4aab71b95c6…

MALICIOUS

Office (OOXML)

1.38 MB Created: 2018-05-01 16:29:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2018-06-19
MD5: de5972c75857788564fe2e0b0ef3ab25 SHA-1: 29f550397718219f8bc4af428bbefaf866be2cfb SHA-256: 627dd4aab71b95c67062c543922025895f6bea3f0246219dbaeeb8508783994e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1129 Shared Content

The sample is a malicious OOXML document containing an embedded OLE object. Heuristics indicate this object is likely an exploit for CVE-2026-21514, designed to drop an executable payload. The embedded OLE object and associated Ole10Native package are the primary indicators of this malicious behavior, suggesting an attempt to execute a second-stage payload.

Heuristics 5

  • 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 medium 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.
  • Payload URL recovered from embedded OLE object (17 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://ocsp.thawte.com0 In document text (OOXML body / shared strings)
    • http://ts-ocsp.ws.symantec.com07In document text (OOXML body / shared strings)
    • http://sv.symcd.com0&In document text (OOXML body / shared strings)
    • http://s2.symcb.com0In 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)
    • http://ns.adobe.com/xap/1.0/In document text (OOXML body / shared strings)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/pdf/1.3/In document text (OOXML body / shared strings)
    • https://secure.download.dm.origin.com/checkout/OOA/%1.htmlIn document text (OOXML body / shared strings)
    • http://www.openssl.org/support/faq.htmlIn document text (OOXML body / shared strings)
    • http://crl.thawte.com/ThawteTimestampingCA.crl0In document text (OOXML body / shared strings)
    • http://ts-aia.ws.symantec.com/tss-ca-g2.cer0In document text (OOXML body / shared strings)
    • http://ts-crl.ws.symantec.com/tss-ca-g2.crl0In document text (OOXML body / shared strings)
    • https://d.symcb.com/cps0%In document text (OOXML body / shared strings)
    • https://d.symcb.com/rpa0In document text (OOXML body / shared strings)
    • http://sv.symcb.com/sv.crl0WIn document text (OOXML body / shared strings)
    • http://sv.symcb.com/sv.crt0In document text (OOXML body / shared strings)
    • http://www.symauth.com/cps0In document text (OOXML body / shared strings)
    • http://www.symauth.com/rpa00In document text (OOXML body / shared strings)
    • http://s1.symcb.com/pca3-g5.crl0In document text (OOXML body / shared strings)
    • http://ooaactivation.ea.com/ooa/In 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 2042880 bytes
SHA-256: 56ce83350a969fcc7fb01e67e7c800e788ee346210173335c3755ce05d668e09
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL, heap spray 0x07, SC_STR_GETPROCADDRESS Static shellcode analysis recovered API/import strings: LoadLibraryW, GetProcAddress, CreateThread, OpenProcess, shell32.dll, crypt32.dll
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2024238 bytes
SHA-256: 194e365ad63b9f5b59a4436986765f896d94f6b88421a385bd3084521069a9d2
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL, heap spray 0x07, SC_STR_GETPROCADDRESS Static shellcode analysis recovered API/import strings: LoadLibraryW, GetProcAddress, CreateThread, OpenProcess, shell32.dll, crypt32.dll
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5452 bytes
SHA-256: 8d71e1f7b38aa53d5ed6711c74e3ebf9cf76f24af3090ed5c76746916279fc31