RTF malware analysis — malicious · 51d9f637f3794f9e

MALICIOUS

RTF

168.2 KB First seen: 2018-05-18

MD5: c452882aac6a8f34d403ad11dd3eebbb SHA-1: d5cd12939c56ba64ab581d8dbd587eca666d23c8 SHA-256: 51d9f637f3794f9e76da3105dfb8ac3b7f2cccd1621002c15f502a3914e3c3e8

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.

Filename	Kind	Source	Size
`objdata_00_off000006bc.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x6BC	31654 bytes
SHA-256: `42047473b551cf0d5c3607704679d45516900f83026fec10bc00cc30eb37d778`

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