Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 334d50f3ced57bb7…

MALICIOUS

Office (OOXML)

11.6 KB Created: 2018-10-11 12:14:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2019-04-18
MD5: dfad7d4a7ecb2eed6d69abfbfb5f94c9 SHA-1: 88b3189a1f33a0251272c0e4adc775e2db3f4ee5 SHA-256: 334d50f3ced57bb7540f2498705f3e8897148b4d30816be8b3721c49d2d08fe7
142 Risk Score

Malware Insights

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

The OOXML document contains heuristics indicating exploitation of CVE-2017-8759 and CVE-2023-36884, which are known vulnerabilities for remote code execution. These heuristics point to an external RTF document hosted at http://www.webserv-redir.net/images/67381F0B/-1/5272/3cdc4fcb/main.RTF. This suggests the document is designed to download and execute a secondary payload.

Heuristics 4

  • CVE-2023-36884 — external RTF auto-load relationship critical CVE likely CVE_2023_36884
    Document auto-load relationship references a remote RTF file (http://www.webserv-redir.net/images/67381F0B/-1/5272/3cdc4fcb/main.RTF), matching the stronger Storm-0978/RomCom external-RTF delivery shape. Plain clickable hyperlinks are not enough for this CVE rule.
  • OOXML OLE2Link remote document — CVE-2017-8759 related high CVE related CVE_2017_8759_RELATED
    Document contains an o:OLEObject Type=Link whose external oleObject relationship fetches a remote Office-looking document. That is the OOXML OLE2Link staging shape used by CVE-2017-8759 campaigns when the remote document/WSDL supplies the SOAP moniker payload; the local file alone does not contain the WSDL body needed for an exact match.
  • 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://www.webserv-redir.net/images/67381F0B/-1/5272/3cdc4fcb/main.RTF 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/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officedocument/2006/relationships/oleobjectIn 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/image1.emf 2340 bytes
SHA-256: 7d3d98835d2c9c355b5c9f1003c18f805eb2955c7aa76a910e3ba34de7e2edf6

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