Malicious RTF — malware analysis report

Static analysis result for SHA-256 b6bc0f9f4a3b09e5…

MALICIOUS

RTF

44.6 KB Created: 2017-09-14 11:37:00 First seen: 2017-10-10
MD5: 00dfc288232ed0e317d11a048448a14f SHA-1: 997710d225e7d70c511b676286eb1394a7c756b1 SHA-256: b6bc0f9f4a3b09e5d0550d267f47329db66f43b6626abb881205f48777cda647
282 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This RTF document exploits CVE-2017-0199, a known vulnerability in Microsoft Office, to download and execute a secondary RTF payload from the URL http://127.0.0.1:8080/1.rtf. The presence of OLE object data and automatic linking further indicates malicious intent to execute embedded content. The ClamAV detection confirms the malicious nature of this exploit.

Heuristics 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • 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://127.0.0.1:8080/1.rtf In RTF body
    • http://schemas.microsoft.com/office/word/2003/wIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00003590.bin rtf-objdata-decoded RTF \objdata at offset 0x3590 2601 bytes
SHA-256: 2022c82a960b9448881fb2fdfdcacf4ad2080f3f73c558b9acf62f7c040d3eae

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