Malicious RTF — malware analysis report

Static analysis result for SHA-256 7111702bf9ae6392…

MALICIOUS

RTF

5.3 KB First seen: 2017-10-10
MD5: f3584988c8684b2f65d2cf410d63a0bd SHA-1: 089d54ef879e301140abd3c375a435f9bbb8a15a SHA-256: 7111702bf9ae6392b37c93be08dd9941f43f47a241bcf30910b46bfd83b49cff
202 Risk Score

Malware Insights

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

The RTF file contains heuristics indicating the presence of an OLE object that is automatically linked and updated, a common technique for exploiting vulnerabilities like CVE-2017-0199. The ClamAV detection explicitly names this CVE, confirming the exploitation vector. The embedded OLE object likely serves to download and execute a secondary payload, a typical behavior for this type of exploit.

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 1924 bytes
SHA-256: ad3afc1aa5c82a1d24972854db44846dbc5eb7e04664fae2d4f7d6aa9e07682f

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