Malicious RTF — malware analysis report

Static analysis result for SHA-256 d30f604e0369bf72…

MALICIOUS

RTF

107.4 KB Created: 2020-01-16 14:02:00 First seen: 2020-05-25
MD5: b9ba7038af8c26f0608454961c4f1b91 SHA-1: 16e1a66c018a50367e83fbf9b98c634c5ef97473 SHA-256: d30f604e0369bf72c2d05bf81413ba0db115199660454c6312284b8c3ce465e9
202 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects that exploit known vulnerabilities, specifically CVE-2017-11882 (Equation Editor FONT record overflow) and CVE-2017-8759 (MSXML SAX OLE activation). These exploits are designed to execute arbitrary code, likely to download and run a second-stage payload from the unknown URL https://fitgime.com/csi/bin_4df1.msi. The document body content is minimal and does not provide further context.

Heuristics 6

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • 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.
  • \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 https://fitgime.com/csi/bin_4df1.msi In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000089bb.bin rtf-objdata-decoded RTF \objdata at offset 0x89BB 15672 bytes
SHA-256: 6796f62c6e5a16dae14e7e04d7b13b45fe5def9f5764910725a965c7a4e606bc

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