Malicious RTF — malware analysis report

Static analysis result for SHA-256 ffb19f1fabf1eab3…

MALICIOUS

RTF

1.28 MB Created: 2019-09-17 13:59:00 First seen: 2020-09-07
MD5: 50dbd521f136bebdaf7e982763a1eff7 SHA-1: 830f8b87de100e2c142241f4be11023496400b31 SHA-256: ffb19f1fabf1eab3bb4fdb88befe484eb8e4a1929394ca4f17c3fd8bada814f4
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 exploit is known to be used for client-side execution, likely to download and run a secondary payload. The presence of the benign URL is not indicative of malicious activity.

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_off0012ef7c.bin rtf-objdata-decoded RTF \objdata at offset 0x12EF7C 1414 bytes
SHA-256: 1800eb35bc67c085365fb56978c1b142e57e79601848b99e53c94a0a99f3c20b

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