Malicious RTF — malware analysis report

Static analysis result for SHA-256 90f2ebbcfea69e0d…

MALICIOUS

RTF

186.1 KB Created: 2017-10-24 10:23:00 First seen: 2017-10-28
MD5: a6128a0fdad36bf3e2a3151984c24dc6 SHA-1: 6e0ec567fec11874176ef37560565516dd097dbb SHA-256: 90f2ebbcfea69e0ddef19aafd9e8a987ec2a4be35a1b2e11b814aaa25185a174
262 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and triggers critical heuristics for CVE-2017-0199 and CVE-2017-8759. These vulnerabilities are exploited via SOAP Moniker and OLE2Link respectively, with the latter pointing to 'http://chilibi.com/top/t.php?thread=0&t=h' for payload retrieval. The file is identified as a downloader by ClamAV, indicating its primary purpose is to fetch and execute additional malicious content.

Heuristics 7

  • SOAP Moniker — CVE-2017-8759 (SOAP WSDL RCE) critical CVE related CVE_2017_8759
    RTF \objdata decodes to OLE data containing the SOAP Moniker — CVE-2017-8759 (SOAP WSDL RCE) CLSID — the vulnerable control/moniker is embedded directly in the document's object stream, the delivery shape of this exploit. RTF objects auto-render when Word opens the file.
  • 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.Downloader.CVE_2017-6336326-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Downloader.CVE_2017-6336326-3
  • 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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
  • 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://chilibi.com/top/t.php?stats=send&thread=0 In RTF body
    • http://chilibi.com/top/t.php?thread=0&t=hIn 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_off00002a44.bin rtf-objdata-decoded RTF \objdata at offset 0x2A44 4666 bytes
SHA-256: 0943564274d7cba254ea2cba4f8c893fcc56af414cace4d6f6175b36e007f1de
objdata_01_off0000526b.bin rtf-objdata-decoded RTF \objdata at offset 0x526B 4372 bytes
SHA-256: 03b026fc590ed41194fd1df81357a6a76520f0ed08450085bdcefc3440ad8bec

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