Malicious RTF — malware analysis report

Static analysis result for SHA-256 309d29a24ccbd222…

MALICIOUS

RTF

1.76 MB Created: 2019-09-17 13:59:00 First seen: 2020-05-25
MD5: ee4398add23f08fb9d5c1fd8e5118e40 SHA-1: c57b587eef4b8143baead05c48d43d70eef03ade SHA-256: 309d29a24ccbd22254f134024ff23cffcf28c5eeb44e96ea838a14cb424d1c6f
142 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that is forced to activate via \objupdate, exploiting CVE-2017-8759. This indicates the file is designed to execute arbitrary code, likely to download a secondary payload. The benign URL found is not considered a threat.

Heuristics 5

  • 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_off001a9675.bin rtf-objdata-decoded RTF \objdata at offset 0x1A9675 1413 bytes
SHA-256: 75e2a70e855c6a7de40ac21acb798b4c47f1be75ab637c719f714fa3892fd7ce

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