RTF malware analysis — malicious · 9fd13f01ba3ec52f

MALICIOUS

RTF

5.6 KB Authoring application: Msftedit 5.41.21.2510 First seen: 2018-11-05

MD5: 72fd9a5cd0c8a6db16c92c17dcc3903e SHA-1: b6cf8e3c2efc69b2a7ba718a2a8f830853bf7223 SHA-256: 9fd13f01ba3ec52f135aa3fb0ebdc75bf8ffc6842bda7b51038015b7f0fe0e1c

222 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF document contains an OLE object that exploits CVE-2017-0199, a known vulnerability for client execution. The exploit targets the URL http://192.168.3.6/exploit.html, which is likely used to download and execute a second-stage payload. The presence of OLE object data and automatic linking further supports the exploitation attempt.

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://192.168.3.6/exploit.html In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off00000105.bin`	rtf-objdata-decoded	RTF \objdata at offset 0x105	2724 bytes
SHA-256: `71a615157dde6c578bec670620a6811079bba732b4292e3e37bcc6ff1ed72744`

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