RTF malware analysis — malicious · 45cf046f936d9724

MALICIOUS

RTF

5.6 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2019-04-18

MD5: 6051682370fb76b81bbd0632e2d6b5ba SHA-1: ed4d340fd8c4c882aa3c6afa4df00fbd685988e9 SHA-256: 45cf046f936d9724057b9771d3f743cf7844ce24d6b33a93be61c3db10ef45c8

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and is flagged for CVE-2017-0199 exploitation. This vulnerability is used to automatically link and update an OLE object, which in this case attempts to download a payload from the URL http://1.1.1.1/exploit.html. The file is identified as malicious by ClamAV with a signature specific to this exploit.

Heuristics 6

CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199

RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://1.1.1.1/exploit.html In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000104.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x104	2724 bytes
SHA-256: `88b6d27e6337a592004e6eac86de7fd8b53a962a68f717526f68c26108c5d2ba`

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