Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 89509bc1d672890a…

MALICIOUS

Office (OOXML) / .DOC

336.7 KB Created: 2023-01-25 06:02:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2023-01-26
MD5: 36240efa4828ea52e9c7c021ba2741b3 SHA-1: 3d01a45bf4096d06afea061b3910982a5e178e74 SHA-256: 89509bc1d672890a38b011535d5ccb5ad5870cc6d111ae897c31f6f25aae6395
262 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The sample leverages multiple CVEs (2017-0199, 2017-8759, 2023-36884) to load external content. Specifically, it uses OLE2Link objects to fetch and execute payloads from mediafire.com and catbox.moe. The MSHTML external object relationship points to an HTA file, indicating a likely execution chain designed to download and run a second-stage payload.

Heuristics 7

  • CVE-2023-36884 — external RTF auto-load relationship critical CVE likely CVE_2023_36884
    Document auto-load relationship references a remote RTF file (https://www.mediafire.com/file/eamsi5gf1wrile2/Update.rtf), matching the stronger Storm-0978/RomCom external-RTF delivery shape. Plain clickable hyperlinks are not enough for this CVE rule.
  • MSHTML-style external object relationship critical CVE related OFFICE_MSHTML_EXTERNAL_OBJECT
    External relationship to https://files.catbox.moe/lqc0er.hta — exploitable MSHTML/CAB/MHTML/HTA-style Office attack surface
  • 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.
  • 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 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 https://www.mediafire.com/file/t0gqzzcaafv8deb/MAINPAYLOAD.docx
    • https://files.catbox.moe/lqc0er.hta
    • https://www.mediafire.com/file/eamsi5gf1wrile2/Update.rtf
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://www.google.com
    • http://schemas.openxmlformats.org/officedocument/2006/relationships/oleobject

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
68acdc747300a4240f7c6c9f59c09e6d5fb342b20a5113e175ae5735333cc2a6		 ooxml-ole-object OOXML embedded OLE part: word/embeddings/----.---- 16770 bytes

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