RTF malware analysis — malicious · 8494a1c3ebcdb84c

MALICIOUS

RTF

290.7 KB First seen: 2018-11-05

MD5: db3c277d658fc1b0744205172990969d SHA-1: afc531e5f279342d565d9b16b1e2c40d23241b6c SHA-256: 8494a1c3ebcdb84cffd075bd16606b408c7d88bbe5b7b7ef8486b867b020847f

160 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains OLE object data that is automatically linked and updated, triggering the CVE-2017-0199 or CVE-2017-8759 vulnerability. This vulnerability allows for the automatic loading and execution of a remote payload embedded within the OLE moniker stream. The document body contains financial transfer details, suggesting a lure for financial fraud.

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_off00000173.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x173	2619 bytes
SHA-256: `fcbabfdbbf0771f67ece509febf5dd3726946d547ddbdbf3d9b9c05301312b2d`

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