Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 adf351cc01b75274…

MALICIOUS

RTF / .DOC

1.13 MB Created: 2019-09-17 13:59:00
MD5: 05a95cb15e982fb9b37ff2afac21be9f SHA-1: a012d0a28df2eb98b19ebade7f5f54123aad5df6 SHA-256: adf351cc01b75274d0ad9b3a9e3052d1b4e2f04070f8d606396e65b2e4611621
200 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 User Execution: Malicious Link T1566.001 Phishing: Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-8759) via OLE object activation. This indicates a likely attempt to exploit the user to download and execute a secondary payload. The embedded URL, while benign, is part of the document's structure related to the 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_off0011783d.bin
801d070789d2f3d324ee59825fc4d284bbe02d00f19e3b7ebaa466d06469971c		 rtf-objdata-decoded RTF \objdata at offset 0x11783D 3739 bytes

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