Malicious RTF — malware analysis report

Static analysis result for SHA-256 f28c01864641f37e…

MALICIOUS

RTF

202.4 KB Created: 2018-07-29 12:02:00 First seen: 2019-08-04
MD5: 59192554d9ad2a22602ab200a2d51245 SHA-1: 2f14af77d1335f159284e71d09d3d64dfdb81139 SHA-256: f28c01864641f37e7fa70fec52886d40a8a86718bc4366dca7e5963a1b1097cf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file exploits CVE-2017-11882 and CVE-2017-8759, known vulnerabilities in Microsoft Equation Editor and MSXML respectively, to execute arbitrary code. This code likely downloads and executes a second-stage payload from the URL https://bvn-continental.com/aa/sayed_output14a4360.msi, which is identified as a potential indicator of compromise.

Heuristics 5

  • 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.
  • 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 https://bvn-continental.com/aa/sayed_output14a4360.msi In RTF body
    • https://mawdoo3.com/%D9%85%D8%A7_%D9%87%D9%88_%D8%A7%D9%84%D8%A7%D9%82%D8%AA%D8%B5%D8%A7%D8%AFIn RTF body
    • http://schemas.microsoft.com/offIn RTF body
    • https://mawdoo3.com/%D9%85%D8%A7_%D9%87%D9%88_%D8%A7%D9%84%D8%A7%D9%82%D8%AA%D8%B5%D8%A7%D8%AF}{In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00013311.bin rtf-objdata-decoded RTF \objdata at offset 0x13311 15672 bytes
SHA-256: 8295020b79c43aff353790ed050b99712cee3fc4fdd7be827dd83307e295fd48

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