Malicious RTF — malware analysis report

Static analysis result for SHA-256 29ffab1945140b30…

MALICIOUS

RTF

413.5 KB Created: 2019-09-17 13:59:00 First seen: 2020-09-15
MD5: d41a4bf9b84f42a0d085687bbabcd93b SHA-1: afceb4f7b9755ec3193d797d2f13eb8d7dbed317 SHA-256: 29ffab1945140b3023abfa94dcca51b72dca9473dc5ccead086bef6205b37265
142 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an embedded OLE object that is configured to update automatically. This functionality is leveraged to exploit CVE-2017-8759, a vulnerability in MSXML SAX OLE activation, allowing for arbitrary code execution. The embedded URL is confirmed benign and no scripts were extracted, limiting further analysis of the payload.

Heuristics 5

  • 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.
  • \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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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/2003/wordml In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0005fccb.bin rtf-objdata-decoded RTF \objdata at offset 0x5FCCB 1414 bytes
SHA-256: b3b45ab73d4490d65f244741657dd6f8855678bce8440ba803225948dbd954be

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