Malicious RTF — malware analysis report

Static analysis result for SHA-256 77fbcdee259e75a9…

MALICIOUS

RTF

41.6 KB Created: 2017-05-04 11:23:00 First seen: 2017-12-09
MD5: 8525e6b2166cfd37876e7e05b064f14b SHA-1: 2db53f32c86b67f5cf23fbbfcac537e595d2cf78 SHA-256: 77fbcdee259e75a925e60afe412d92a53b527170840b38dd34c6df2a1e6bb754
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. This object attempts to download a secondary document from the URL http://5.9.79.214:8080/test.doc, likely to execute further malicious code. The file is identified as malicious by ClamAV with a specific signature for this CVE.

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://5.9.79.214:8080/test.doc In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002b3b.bin rtf-objdata-decoded RTF \objdata at offset 0x2B3B 2601 bytes
SHA-256: df96b81063483dbdd0ebb1cf9cbb8667f267150a5a7faae361f5751c240cdf80

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