Malicious RTF — malware analysis report

Static analysis result for SHA-256 cbf92c4f3d16d79a…

MALICIOUS

RTF

2.42 MB Created: 2017-04-23 04:20:00 First seen: 2017-12-24
MD5: 643cc38e2ec3661e59681843c4e78173 SHA-1: a221a6dbbbe8ba563479f6cc344a2b52f5974275 SHA-256: cbf92c4f3d16d79a97f2048e0e5eec38c75442f01bbf8eb485a5d759f434e7bf
362 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple critical heuristic firings indicating exploitation of CVE-2017-0199 and CVE-2017-8759, which are known vulnerabilities for client execution. The file embeds a weaponized URL pointing to 'http://comonscar.in/test4.hta', which is likely the second-stage payload. The presence of OLE object data and excessive hex data further supports the malicious nature of the file.

Heuristics 9

  • 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 / weaponized URL) critical CVE exact CVE_2017_0199_WEAPONIZED_URL
    RTF contains a URL Moniker OLE link to a script/HTA/template-style remote loader, matching the tighter static CVE-2017-0199 shape.
  • CVE-2026-21514 — Word/OLE security bypass in RTF high CVE likely CVE_2026_21514
    RTF contains a hidden \svb hex package with DrsE2oDoc and downRevStg drawing compatibility parts. This matches an observed CVE-2026-21514 exploitation shape that manipulates Word's internal document structure and trust decisions.
  • 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~2434KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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://www.neway-technologies.com/ In RTF body
    • http://comonscar.in/test4.hta}{In RTF body
    • http://comonscar.in/test4.htaIn RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00263258.bin rtf-objdata-decoded RTF \objdata at offset 0x263258 3924 bytes
SHA-256: 7299f8c055e99c3761915a8151269dfbfd95d44afabc8b42bc9794d83e651abc
rtf_svb_00003a32.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x3A32 1617 bytes
SHA-256: 76b5532ebc2fe9775fe799a2c6cdaa71cf385b6ce36f0e2d575a0a038d24279c

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