Malicious RTF — malware analysis report

Static analysis result for SHA-256 5ac4bc4d6635aa0f…

MALICIOUS

RTF

31.6 KB First seen: 2019-05-16
MD5: 0159a5d62530f35dff9d8706b4712c60 SHA-1: 8db16bc2d39bc2ba917803fe0a11c50c6aa45818 SHA-256: 5ac4bc4d6635aa0ff3d0b74269c85f79cdaba3b91d2d32469d74974acc906041
122 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and triggers an objupdate event, indicating an attempt to activate embedded content. The critical heuristic firing for RTF_EQUATION_EDITOR at offset 0x7477 strongly suggests exploitation of the Equation Editor vulnerability (CVE-2017-11882) for client execution. The embedded URL, though benign, is present within the RTF body, consistent with malicious documents.

Heuristics 4

  • Split hex Equation Editor ProgID + OLE object critical CVE likely RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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 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 In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000070f1.bin rtf-objdata-decoded RTF \objdata at offset 0x70F1 1456 bytes
SHA-256: b5fe19a55d4cb45dbd7abff9da0ef72734c27ac640a106b12d2bc2507b1a811c

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