Malicious RTF — malware analysis report

Static analysis result for SHA-256 e3ad5d744ce2eaba…

MALICIOUS

RTF

165.0 KB First seen: 2019-06-27
MD5: 0763e7a89429b848079354ffe7216429 SHA-1: 4d7f524c5c22618f876c5b625af9a49ffb9df411 SHA-256: e3ad5d744ce2eaba6a8b37968bc3156d423a93eac60b52463106fcb04094214c
120 Risk Score

Malware Insights

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

The RTF document contains OLE object data and triggers a critical heuristic for CVE-2017-8759, indicating exploitation of a SOAP Moniker vulnerability. This vulnerability is used to execute arbitrary code, likely to download and run a secondary payload. The presence of ".objdata" and ".objupdate" sections further supports the exploitation of embedded OLE objects.

Heuristics 3

  • SOAP Moniker — CVE-2017-8759 (SOAP WSDL RCE) critical CVE related CVE_2017_8759
    RTF \objdata decodes to OLE data containing the SOAP Moniker — CVE-2017-8759 (SOAP WSDL RCE) 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.
  • \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 50036 bytes
SHA-256: d9718da86256fc604039428d84e3a2dbe8f707b3e6f96448b4bf17b55723fc9b

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