Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 f82dc105aa33a552…

MALICIOUS

RTF / .DOC

513.2 KB Created: 2019-09-17 13:59:00
MD5: 955ccc08dc9af748392bbcabad53e99d SHA-1: 06213b02839901c7ad8964ff2d37cfe6c44f943d SHA-256: f82dc105aa33a5527b0c40a55fe650f0f323e969dc7012c7a24f583614c14158
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The file is an RTF document containing embedded OLE objects, specifically triggering the Equation Editor CLSID. Critical heuristics indicate exploitation of CVE-2017-8759, which involves MSXML SAX OLE activation. This suggests the document is designed to exploit this vulnerability to execute arbitrary code, likely as a downloader or initial access vector.

Heuristics 6

  • 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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0007960a.bin
25a536da4090527c42a0cfcd345883f88c6367a579ae3c9460962f5c2647255f		 rtf-objdata-decoded RTF \objdata at offset 0x7960A 3739 bytes

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