Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 35096c63c0ff620e…

MALICIOUS

Office (OOXML)

360.7 KB Created: 2017-03-31 12:48:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2020-02-04
MD5: e494356fc0db7ef6009d29e5ae869717 SHA-1: 6fa2b42025ae68e5b9f46bca6dd694a110308774 SHA-256: 35096c63c0ff620eb0715c4e2bbbe38350ab54d79724d1a60ae33e08ef6b8a73
162 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and exhibits characteristics of CVE-2026-21514 exploitation due to an embedded OLE object containing executable or script indicators. The embedded OLE package further suggests the presence of a malicious link or executable. Although the document body is truncated, the presence of shellcode command strings and the overall structure indicate an attempt to download and execute a second-stage payload, likely via JavaScript.

Heuristics 5

  • ClamAV: Win.Phishing.Suspicious-6355520-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Phishing.Suspicious-6355520-3
  • Ole10Native package carries executable/script file type high OFFICE_PACKAGE_RISKY_FILE
    OLE Package displayName or fullPath ends in an executable or script-capable extension. Even without UI extension spoofing, embedding a runnable payload inside an Office document is a high-risk delivery pattern.
  • Suspicious extracted artifact high 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 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 4608 bytes
SHA-256: 737e38d31c10337fa0c5948be21f1a60e75c9ec2117455b66b764cb8d2f1188e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): mshta.exe
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML word/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 2251 bytes
SHA-256: 1054ad60e385e1d2e91829637a16063f7f0d65521f033566bde91f45625678ba
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): mshta.exe
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 5440 bytes
SHA-256: 5b770902510165b45be0cf350e2877dc10c2515c0752cbed15702715e5200e91

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