Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 319db5189afdebe5…

MALICIOUS

RTF / .DOC

1.19 MB Created: 2019-09-17 13:59:00
MD5: ae2bd11f4b7d90c87e1c865215b51d6c SHA-1: 671fec71281833d7fe9ba2594d19c5ebf3f45b01 SHA-256: 319db5189afdebe5f897fc3f94b2d70e8ee9761e3d9ca804178c468573852132
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1204 User Execution

The file is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor. Critical heuristics indicate exploitation of CVE-2017-8759, a vulnerability related to MSXML SAX OLE activation. This suggests the document is designed to exploit this vulnerability upon opening, likely to download and execute a second-stage 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_off0011e1ef.bin
191e86caa3f80aac5d7642c293d8ce61ff228f3a6100821966c8bcb1a5e911e1		 rtf-objdata-decoded RTF \objdata at offset 0x11E1EF 3732 bytes

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