Malicious RTF — malware analysis report

Static analysis result for SHA-256 9f4be1ba89a76d16…

MALICIOUS

RTF

191.3 KB Created: 2019-09-17 13:59:00 First seen: 2020-02-04
MD5: 0a46937cc55a5f6bf47193646e60fa31 SHA-1: 83f0ca97e75bb8f4a8691f59bbac5c3aca6f6245 SHA-256: 9f4be1ba89a76d168883ceeee27d4dae496c420eb00dce2b2d84512b5b449173
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 update via \objupdate, triggering an exploit for CVE-2017-8759. This vulnerability in MSXML SAX allows for OLE activation, which is a common method for executing arbitrary code. The embedded object likely serves as a dropper for a secondary payload.

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_off0001f3bd.bin rtf-objdata-decoded RTF \objdata at offset 0x1F3BD 25638 bytes
SHA-256: c235f042614c58916c4019b3ad37b69f02fb6618fee2eaa41a1ede1b64dd383d

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