Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b19dfaea974e2ddb…

MALICIOUS

RTF / .DOC

826.4 KB Created: 2019-09-17 13:59:00
MD5: 6c082dc2d9082d5334a63f8f50114bc8 SHA-1: 5c5870ba48768aeb44387f806710c36f5d7189ca SHA-256: b19dfaea974e2ddb18f42889a54adecadb468ebbe2729cd046a227bf8dc76c34
240 Risk Score

Malware Insights

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

The sample is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-8759) through OLE object activation. This indicates an attempt to execute arbitrary code upon opening. The presence of RTF object data and the specific exploit firing strongly suggest a malicious payload delivery mechanism. The document also contains a heuristic indicating it's a lure for password-protected archives, further supporting a malicious intent.

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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_off000bc692.bin
9897e1b5157ea85982056290fd8ff0653889e7edaf2768d15c52fb758c48c5f3		 rtf-objdata-decoded RTF \objdata at offset 0xBC692 3732 bytes

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