RTF malware analysis — malicious · c785b1970b4f2362

MALICIOUS

RTF

737.4 KB First seen: 2018-04-23

MD5: cd58668247c40e8a867983d88d8b8cb9 SHA-1: d806892a8da847b85053c7207a710022588b6978 SHA-256: c785b1970b4f23620b2da6dd6a375ae2ba4fb61ff0c1d5567ca9ae68a742c071

160 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains OLE object data that is automatically linked and updated, indicating exploitation of CVE-2017-0199 or CVE-2017-8759. This vulnerability allows for the automatic loading and execution of a remote payload embedded within the OLE moniker stream. The specific vulnerabilities exploited are identified as CVE-2017-0199 and CVE-2017-8759.

Heuristics 4

CVE-2017-0199 / CVE-2017-8759 (OLE2Link auto-activated remote loader) critical CVE related RTF_OLE2LINK_REMOTE_MONIKER_LOADER

RTF embeds an OLE2Link object that is force-activated with \objupdate (no user interaction on open) and fetches a remote second stage — through an INCLUDETEXT/INCLUDEPICTURE field or the OLE object's own moniker. This is the OLE2Link auto-update attack path shared by CVE-2017-0199 (server returns an HTA/scriptlet) and CVE-2017-8759 (server returns a SOAP WSDL the .NET parser compiles). Office processes the fetched response through the same code path; the specific CVE depends on the now-unreachable server content type.
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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000044.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x44	4512 bytes
SHA-256: `71e171baf62edb51af6769f1889e118b9dd026ffdc7c8adcb5b42a413de6565f`

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