Malicious RTF — malware analysis report

Static analysis result for SHA-256 37cdad2464eca804…

MALICIOUS

RTF

648.1 KB Created: 2018-07-17 21:49:00 First seen: 2018-10-09
MD5: 75619c54f8a534c5934721364ba74e25 SHA-1: 90248d28d6b0f449f2cc85bdfb9fa6a7fdc0e282 SHA-256: 37cdad2464eca804162ba012155826e4853e5e69702be25354b276d03d57137a
302 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects that trigger known vulnerabilities, specifically CVE-2017-11882 (Equation Editor font record overflow) and CVE-2017-8759 (MSXML SAX OLE activation). These exploits are critical and indicate the file's primary purpose is to achieve code execution on the victim's machine, likely for downloading and running a subsequent stage. The presence of benign Wikipedia URLs does not detract from the critical exploit findings.

Heuristics 8

  • 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.
  • URL Moniker in RTF OLE object high CVE related RTF_URL_MONIKER_RELATED
    RTF contains a URL Moniker GUID in OLE object context, but no decoded remote target was confirmed. Treat as related OLE2Link attack-surface evidence rather than proof of CVE-2017-0199 exploitation.
  • 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://juupajoenmll.fi/logstxt.msi In RTF body
    • https://en.wikipedia.org/wiki/Australian_rules_footballIn RTF body
    • https://en.wikipedia.org/wiki/Australian_Football_LeagueIn RTF body
    • https://en.wikipedia.org/wiki/2002_Australian_Football_International_CupIn RTF body
    • https://en.wikipedia.org/wiki/International_Australian_Football_CouncilIn RTF body
    • https://en.wikipedia.org/wiki/Australian_Football_International_CupIn RTF body
    • https://en.wikipedia.org/wiki/Australian_rules_football_in_AustraliaIn RTF body
    • https://en.wikipedia.org/w/index.php?title=Australian_Football_International_Cup&action=edit&section=1In RTF body
    • https://en.wikipedia.org/wiki/Ireland_national_Australian_rules_football_teamIn RTF body
    • https://en.wikipedia.org/wiki/2011_Australian_Football_International_CupIn RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
    • https://en.wikipedia.org/wiki/CompetitionIn RTF body
    • https://en.wikipedia.org/wiki/AustraliaIn RTF body
    • https://en.wikipedia.org/wiki/Grand_finalIn RTF body
    • https://en.wikipedia.org/wiki/Curtain_raiser_(dramaIn RTF body
    • https://en.wikipedia.org/wiki/AFL_New_ZealandIn RTF body
    • https://en.wikipedia.org/wiki/CanadaIn RTF body
    • https://en.wikipedia.org/wiki/DenmarkIn RTF body
    • https://en.wikipedia.org/wiki/IrelandIn RTF body
    • https://en.wikipedia.org/wiki/JapanIn RTF body
    • https://en.wikipedia.org/wiki/NauruIn RTF body
    • https://en.wikipedia.org/wiki/New_ZealandIn RTF body
    • https://en.wikipedia.org/wiki/Papua_New_GuineaIn RTF body
    • https://en.wikipedia.org/wiki/SamoaIn RTF body
    • https://en.wikipedia.org/wiki/South_AfricaIn RTF body
    • https://en.wikipedia.org/wiki/United_KingdomIn RTF body
    • https://en.wikipedia.org/wiki/United_StatesIn RTF body
    • https://en.wikipedia.org/wiki/SpainIn RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0006cb43.bin rtf-objdata-decoded RTF \objdata at offset 0x6CB43 15672 bytes
SHA-256: b165f2c1632a69bc60af7870643a0d5e401d9ef6a57ecde881a0f8b13d564d12

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