Malicious RTF — malware analysis report

Static analysis result for SHA-256 f365dd58ddda1f3b…

MALICIOUS

RTF

3.51 MB Created: 2019-09-17 13:59:00 First seen: 2020-05-25
MD5: 54ca79affab56ce21d8eb4582bdcfd9a SHA-1: c721bd88d3a4c739acf7d93f91b454c22b012d74 SHA-256: f365dd58ddda1f3b563315dff44d379e98b592ffaeb2a2f11521c28793f4a01c
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 configured to update automatically, triggering an exploit for CVE-2017-8759. This vulnerability allows for the execution of arbitrary code, and the embedded object likely serves to download and execute a secondary malicious payload. The presence of OLE object data and the specific exploit targeted suggest a downloader or dropper functionality.

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_off0036d5a4.bin rtf-objdata-decoded RTF \objdata at offset 0x36D5A4 1413 bytes
SHA-256: a4380e8f6b0726ed0f675f1acf0f01a73ebdb6d8eddd03ae96defd2b7945c431

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