Malicious RTF — malware analysis report

Static analysis result for SHA-256 7c19d377e183dad9…

MALICIOUS

RTF

261.1 KB Created: 2018-07-03 09:28:00 First seen: 2018-09-04
MD5: c5bb00e2ff5a9b7b80015e90e29bc4a8 SHA-1: 6f6aa0e3f86ef46ea8cadbffd25c29f1dde8b497 SHA-256: 7c19d377e183dad98f6775a15584f3f96242cf4a576c4e6fa306b6916aad58af
262 Risk Score

Malware Insights

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

The sample is an RTF document that contains embedded OLE objects, specifically targeting CVE-2017-11882 and CVE-2017-8759. These exploits are designed to execute arbitrary code, and in this case, the embedded object likely leads to the download and execution of a malicious MSI installer from the URL http://rus-fishing.com/images/main/2/dc_outputf11d56f.msi. The ClamAV detection further confirms the presence of the CVE-2017-11882 exploit.

Heuristics 7

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • 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.
  • ClamAV: Doc.Exploit.Cve_2017_11882-7570663-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.Cve_2017_11882-7570663-1
  • \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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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://rus-fishing.com/images/main/2/dc_outputf11d56f.msi 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_off0000bf6b.bin rtf-objdata-decoded RTF \objdata at offset 0xBF6B 15672 bytes
SHA-256: 09e44ea3d1645077b38acd9847319858213b0aabb99d7105f7d171c1aa6f2001

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