Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 9141c89588e4a8e4…

MALICIOUS

RTF / .DOC

1.17 MB Created: 2019-09-17 13:59:00
MD5: 02dcc04fbe02067ae75660c024b39836 SHA-1: 1d4a3bb63194d228a89304bfd29db6b58a8819a2 SHA-256: 9141c89588e4a8e4ee2169cf5e9ef95d1e57b6f12915d130d05a52bc9d9dd281
200 Risk Score

Malware Insights

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

The sample is an RTF document containing embedded OLE object data, specifically triggering heuristics for RTF_OBJDATA, RTF_OBJEMB, RTF_EQUATION_EDITOR, and RTF_OBJUPDATE. Crucially, it fires critical for CVE-2017-8759, indicating exploitation of MSXML SAX OLE activation. This suggests the document is designed to exploit this vulnerability upon opening, likely to download and execute a secondary payload.

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_off00125378.bin
43373fc4b932403873d45138104a23a457ebefb5ab20e35706a1dd7cd7d1a98a		 rtf-objdata-decoded RTF \objdata at offset 0x125378 3739 bytes

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