Malicious RTF — malware analysis report

Static analysis result for SHA-256 0e425100cc728b73…

MALICIOUS

RTF

4.2 KB First seen: 2017-12-09
MD5: 0668fdb7e4e5e5fa30e2226a6ba614ef SHA-1: bb93ebe6d654151332c6a07bb81a00b7769f8610 SHA-256: 0e425100cc728b731a1e431b8298a0d73a4d53c41d5079d253a45a8094326bf9
202 Risk Score

Malware Insights

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

The RTF document contains OLE object data and uses URL monikers, indicating an attempt to exploit a vulnerability. ClamAV specifically identifies this as Rtf.Exploit.CVE_2017_0199-6331394-6, a known exploit targeting Microsoft Office. This exploit likely leads to the execution of a malicious payload, potentially delivered via a spearphishing attachment.

Heuristics 6

  • URL Moniker in RTF OLE object high CVE related RTF_URL_MONIKER_RELATED
    RTF contains a URL Moniker GUID in OLE object context, but no decoded remote target was confirmed. Treat as related OLE2Link attack-surface evidence rather than proof of CVE-2017-0199 exploitation.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6331394-6 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6331394-6
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 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_off000001ab.bin rtf-objdata-decoded RTF \objdata at offset 0x1AB 1657 bytes
SHA-256: 3f107da39c0fdddbe60373cb903dc0dcff2627c3272b87e35313410e05f20feb

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