Malicious RTF — malware analysis report

Static analysis result for SHA-256 5c5fc30e64e0e356…

MALICIOUS

RTF

1.13 MB Created: 2019-09-17 13:59:00 First seen: 2020-05-25
MD5: 91901be47a62ad02d4b46e8d348fd7cc SHA-1: d5ae4f9bb79b0aec00c7af43db4ccdf1a0d9e090 SHA-256: 5c5fc30e64e0e3560ea963feda346cac47594b49a2437642e72c2d1f6bb62353
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, triggering the CVE-2017-8759 vulnerability. This indicates the file is designed to exploit this known vulnerability for client execution, likely as part of a spearphishing attachment. The embedded URL is benign, and no scripts were extracted, but the exploit itself is sufficient evidence of malicious intent.

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_off0011ba18.bin rtf-objdata-decoded RTF \objdata at offset 0x11BA18 1413 bytes
SHA-256: 631e2f5aabc21c309023deffb19a14d2a3afa1c36bc22155b5f56b6c49808178

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