Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 dc220bf8c825bc50…

MALICIOUS

Office (OOXML)

874.0 KB Created: 2021-09-22 07:54:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2021-09-27
MD5: 2552b16b54fca66f06f9c5d9c89fcf30 SHA-1: 7db5d8e35e51b2e0f11a7e853efdfad43926bf75 SHA-256: dc220bf8c825bc50b0dec12387a30b6051b69b28d6c38206e5d6221c74673027
142 Risk Score

Malware Insights

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

The file is identified as malicious due to heuristics indicating exploitation of CVE-2017-0199 and CVE-2021-40444. It contains an external OLE object referencing a URL that is likely used to download and execute a secondary payload. No scripts were extracted, but the exploit itself is sufficient to classify the attack pattern.

Heuristics 4

  • OOXML OLE2Link remote loader — CVE-2017-0199 related high CVE related CVE_2017_0199_RELATED
    Document contains an o:OLEObject Type=Link whose external oleObject relationship points to a remote URL. This is the OOXML OLE2Link activation shape associated with CVE-2017-0199 delivery, but the local file does not expose URL Moniker bytes or a weaponized extension/content type, so the exact CVE cannot be proven statically.
  • ClamAV: Doc.Exploit.CVE-2021-40444-9891698-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE-2021-40444-9891698-2
  • External OLE object relationship high OOXML_EXTERNAL_OLE_OBJECT
    Document contains an oleObject relationship whose target is an external HTTP(S) URL. Office resolves this through OLE/object update paths rather than as a normal user-clicked hyperlink.
  • 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/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)
    • https://xret2pwn.github.io/assets/img/posts/CVE-2021-40444/image-20210911074246672.png!x-usc:https://xret2pwn.github.io/assets/img/posts/CVE-2021-40444/image-20210911074246672.pngIn document text (OOXML body / shared strings)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
emf_00.emf ooxml-emf OOXML EMF part: word/media/image2.emf 8164 bytes
SHA-256: 564bc97073bd3931709c9702cae757bc044a8b66ddfdf39bc1971b2e38b721a6

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