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

Static analysis result for SHA-256 ebff177d6adcc758…

MALICIOUS

Office (OOXML) / .DOC

11.0 KB Created: 2017-09-24 17:26:00 UTC Authoring application: Microsoft Office Word 14.0000
MD5: 37fe520ce0aa65933781d31ef0f4f9ef SHA-1: 34f8908c8c6a0a03ab577cc408630fd86d9c9c13 SHA-256: ebff177d6adcc7587ca6f31913a0084b799e32e1a71743b755beee31c5050247
80 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 User Execution: Malicious File T1059.001 PowerShell

The sample is an OOXML document that leverages an OLE2Link object to fetch a secondary document from the URL http://van.info.vn/kest/fox.doc. This is indicative of a downloader attempting to exploit a vulnerability, likely CVE-2017-8759, to execute a malicious payload. No scripts were extracted, but the heuristics strongly suggest a malicious download and execution chain.

Heuristics 3

  • 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://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

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