Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d47b520308710d07…

MALICIOUS

RTF / .DOC

1.19 MB Created: 2019-09-17 13:59:00
MD5: 282c5755b40b10844d81bf06b01db1a6 SHA-1: f5ae54fdc1de02f5e6be4fcd93c63ca561a6f474 SHA-256: d47b520308710d0751e71f6a050d1969a7b02bc3747d89686987db2173c65972
200 Risk Score

Malware Insights

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

The file is an RTF document containing an embedded OLE object, specifically triggering the CVE-2017-8759 vulnerability. This indicates an attempt to exploit a known vulnerability in Microsoft Office's XML parsing to achieve code execution. The presence of RTF_OBJDATA and RTF_OBJEMB heuristics further supports the exploitation of embedded objects. The document body is heavily obfuscated and does not provide clear user-facing content, but the critical heuristics point towards a vulnerability exploit.

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_off00127fb2.bin
6bc2c9fdbde9f54f64e948ec95f3d56216471720a716ebca4e36fdcdf33e59c5		 rtf-objdata-decoded RTF \objdata at offset 0x127FB2 3739 bytes

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