Malicious RTF — malware analysis report

Static analysis result for SHA-256 8bcfbc2e21783a62…

MALICIOUS

RTF

1.67 MB Created: 2019-09-17 13:59:00 First seen: 2021-06-30
MD5: 75ab2dba33584ea3ea57e73a21bab919 SHA-1: f1f4664062be5f6ff6dc3785385799fe9014a5e8 SHA-256: 8bcfbc2e21783a6228e5f253ef918bc79f7bd8ac1224702b70ebc0446cfffe75
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, triggering an exploit for CVE-2017-8759. This exploit is known to facilitate the execution of arbitrary code, likely to download and run a secondary payload. The presence of RTF_OBJDATA and RTF_OBJEMB heuristics further supports the embedding of malicious objects.

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_off001a4564.bin rtf-objdata-decoded RTF \objdata at offset 0x1A4564 1435 bytes
SHA-256: 3accadc69b77e87b3e37decbd99e8cc55f986cb830f0342ea670c75213f19afd

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