Malicious RTF — malware analysis report

Static analysis result for SHA-256 14da4d17b561f46a…

MALICIOUS

RTF

1.73 MB First seen: 2019-01-11
MD5: f37e3c3ca06b2a6ad6987996c10d9cd7 SHA-1: 6a16f39bc4ccdae51c8628d2581985d4dfa7ed79 SHA-256: 14da4d17b561f46a5ff87c7415b62b7c48090ac7039bffc8108e650c3c9a2073
162 Risk Score

Malware Insights

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

The RTF document contains an OLE object that is automatically linked and updated, triggering CVE-2017-0199. This vulnerability is used to fetch and execute a remote payload from the provided URL. The document body is heavily obfuscated and does not provide clear user-facing content, suggesting its primary purpose is exploitation.

Heuristics 5

  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • 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://fex.net/get/055573198016/254668055 In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off001b8e73.bin rtf-objdata-decoded RTF \objdata at offset 0x1B8E73 2603 bytes
SHA-256: 2d6d266808ab7c6640dd4c13574544b698b7b4461b241750acea1e91da9cf411

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