Malicious RTF — malware analysis report

Static analysis result for SHA-256 b1858dc90ecde505…

MALICIOUS

RTF

353.6 KB First seen: 2018-05-18
MD5: 0783f351d81dbea2d8f2ae6dc575c2dd SHA-1: b9ced201dcd8cb5a4301a6c7c86ed1eb3263b782 SHA-256: b1858dc90ecde505cb06ee37246a43d05755d8f7a319e8c106759f7cdb572e65
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 the CVE-2017-8759 vulnerability using a SOAP Moniker. This indicates the file is designed to exploit a known SOAP WSDL Remote Code Execution vulnerability to download and execute a secondary payload. The ".objupdate" directive further forces OLE object activation, confirming the exploitation attempt.

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_off000006bc.bin rtf-objdata-decoded RTF \objdata at offset 0x6BC 92319 bytes
SHA-256: 41f874933cf534d974cb11582645cc0f97332bee7b057fee07f6822539b2cbf5

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