Malicious RTF — malware analysis report

Static analysis result for SHA-256 73a99be1269fd38b…

MALICIOUS

RTF

5.7 KB First seen: 2019-12-09
MD5: c3434787504bb20f4e9be80b77533ff4 SHA-1: 6cba389006481a2b933185548ecc3c5acafb6b21 SHA-256: 73a99be1269fd38b4420532243c856d05e4d1f340b153fc4ba2765b021de1440
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains OLE object data and is flagged for exploiting CVE-2017-8570, which is known to drop a script. The embedded object data, when decoded, likely contains the malicious script payload. The presence of ".objdata" and ".objupdate" directives further indicate the activation of embedded objects for execution.

Heuristics 6

  • Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570
    RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • ClamAV: Rtf.Exploit.CVE_2017_8570-6596183-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_8570-6596183-0
  • 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 2633 bytes
SHA-256: d05bba13cc744463868cc9d9d5c997333b5d280ae6fe5ea53f81954ce43e66a6

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