Malicious RTF — malware analysis report

Static analysis result for SHA-256 e5140cf486671ca8…

MALICIOUS

RTF

5.1 KB First seen: 2017-12-08
MD5: cda718fe6bb14e9744a4eaab5588ee53 SHA-1: a3d797faef25d61b4d18f52d980bdf4dbcf60535 SHA-256: e5140cf486671ca8de31c7d8f6b29a6897f93e0a91281b743af3fe503971613a
162 Risk Score

Malware Insights

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

The RTF file contains an OLE object that is automatically linked and updated, exploiting CVE-2017-0199. This vulnerability allows the document to fetch and execute a payload from the embedded URL http://bellasimpson.com/adobe.png. The presence of OLE object data and the specific CVE exploit indicate a malicious document designed to download and run a secondary stage.

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 http://bellasimpson.com/adobe.png In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003f.bin rtf-objdata-decoded RTF \objdata at offset 0x3F 2595 bytes
SHA-256: fed30e1c75a01026a0e211f9c05dc6c536f0834b26055323d09e4d8fdbfaee93

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