Malicious RTF — malware analysis report

Static analysis result for SHA-256 a64ea888d412fd40…

MALICIOUS

RTF

40.5 KB Created: 2017-04-20 06:41:00 First seen: 2019-09-30
MD5: d5201115c153dfff0643645e1f2372bf SHA-1: 82f0f85726bc6eff13fe97d3f6a7b3ebe3682762 SHA-256: a64ea888d412fd406392985358a489955b0f7b27da70ff604e827df86d2ca2aa
282 Risk Score
Tags
ta459

Malware Insights

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

The RTF file contains critical heuristics indicating exploitation of CVE-2017-0199, which is used to fetch a remote RTF file from http://122.9.52.215/news/power.rtf. This indicates the file's primary purpose is to act as a dropper for a second-stage payload.

Heuristics 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • 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.
  • ClamAV: Doc.Dropper.Agent-6949741-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6949741-0
  • 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://122.9.52.215/news/power.rtf In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000028c9.bin rtf-objdata-decoded RTF \objdata at offset 0x28C9 2601 bytes
SHA-256: ae2d10bada03e7b6f899aced57acbd6a13a44784e538aef4b9d989bc9664f77a

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