Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c0811c19429ca125…

MALICIOUS

Office (OOXML)

11.9 KB Created: 2017-09-24 17:26:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2020-02-04
MD5: b8cae83daeb0d964d988eacb7f43e4f7 SHA-1: a44402dcc42ac36e05be0c867b08f90d114d1616 SHA-256: c0811c19429ca125a42ed0c81a9f1158b329c215bbea1196d5731265a8c101d2
122 Risk Score

Malware Insights

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

The sample is an OOXML document that contains an external OLE object relationship pointing to a remote document. This relationship targets a free TLD, indicating a likely attempt to exploit CVE-2017-8759 to download and execute a malicious payload. The embedded URL is the primary indicator of compromise.

Heuristics 4

  • 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.
  • OOXML external relationship targets a free/throwaway TLD high OOXML_EXTERNAL_REL_FREE_TLD
    Document has an external relationship whose target host is on a free, no-registration TLD (Freenom .ml/.ga/.cf/.gq/.tk). Legitimate business documents do not link out to a Freenom throwaway domain; these are a near-zero-FP phishing / BEC delivery tell (e.g. an RFQ/invoice lure pointing at 'shareddocuments.ml/RFQ'). The relationship may be a hyperlink, a remote template, or an external OLE object.
  • 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://carsitxal.tk/wp-admin/wp/chigo1/Gozy.doc OOXML external relationship
    • 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/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)

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