Malicious RTF — malware analysis report

Static analysis result for SHA-256 7a36874cf11ddd7b…

MALICIOUS

RTF

104.7 KB Created: 2019-05-28 19:25:00 First seen: 2020-05-25
MD5: cd09c300bae015d054c20a088849ddee SHA-1: 236f1de5a5d53b37c927d6009416221876f94cc9 SHA-256: 7a36874cf11ddd7b3212d19ff5a60f2fb19d75daa6fc38ceadae13ad8e901f55
202 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 specifically triggers the CVE-2017-8759 vulnerability related to MSXML SAX OLE activation. This indicates an attempt to exploit a client execution vulnerability, likely delivered as a spearphishing attachment. No specific malware family could be identified.

Heuristics 6

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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 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_off00015edf.bin rtf-objdata-decoded RTF \objdata at offset 0x15EDF 3662 bytes
SHA-256: 72be3c1ea0eb4d802ee70db5ae79e16c5b43511f546b153cba318c73c966cef1

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