Malicious RTF — malware analysis report

Static analysis result for SHA-256 1efe1581cfca4c63…

MALICIOUS

RTF

56.7 KB Created: 2017-05-02 13:30:00 First seen: 2018-01-23
MD5: 472b8c00a760959a15b5354d6baa4f5f SHA-1: f2664dbc17bacdc2d1496705804b1a2acb7be9f3 SHA-256: 1efe1581cfca4c63b609ed2d638400ef5712606dfd66be14d58636be4c410acf
282 Risk Score

Malware Insights

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

The RTF file contains critical heuristics indicating exploitation of CVE-2017-0199, which is used to activate an OLE object and download a remote RTF file. This technique is commonly used to deliver secondary malicious payloads, suggesting a downloader or exploit dropper functionality. The embedded URL points to a suspicious external resource.

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://172.104.65.97/Office.rtf In RTF body
    • http://schemas.microsoft.comIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00003744.bin rtf-objdata-decoded RTF \objdata at offset 0x3744 2601 bytes
SHA-256: d1125c14d84ce9ea2d27c0554097c093efd03206f31aab182c4414324f5543c8

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