Malicious RTF — malware analysis report

Static analysis result for SHA-256 cbb1f090e12dfc91…

MALICIOUS

RTF

189.5 KB Created: 2019-12-05 12:53:00 First seen: 2020-09-04
MD5: 9a8d9474bfc298e649b9ac391d1af8f9 SHA-1: 1e7b8fd821baccd98a00b48b1e93452968b96815 SHA-256: cbb1f090e12dfc91219944b1c9897bc00e833d38b576104838774af976368c78
142 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that is configured to update automatically upon opening, leveraging the CVE-2017-8759 vulnerability. This technique is commonly used to download and execute malicious payloads. While the embedded URL is benign, the exploit itself indicates a high likelihood 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_off0002a669.bin rtf-objdata-decoded RTF \objdata at offset 0x2A669 1437 bytes
SHA-256: 88464dc7d0ac911be710c05f0c3b13bbadbe486ddf46b74397faf7c3169de9c4

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