Malicious RTF — malware analysis report

Static analysis result for SHA-256 33faff9f607fee5e…

MALICIOUS

RTF

3.56 MB Created: 2017-09-12 12:08:00 First seen: 2017-09-14
MD5: 075b8a220f47fdaeb6d861a0eb29594b SHA-1: 01f2bbd6d87db2ba828f7ac1448b1b9c8d211f74 SHA-256: 33faff9f607fee5e089e023a18b8added3c2a28aec91f4ded375524fe897fbe8
262 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains embedded OLE object data and is weaponized with a URL exploiting CVE-2017-0199. This vulnerability allows the document to download and execute a secondary payload, identified as an HTA file from 'www.winusvlottery.com'. The presence of a large number of font table entries also indicates exploitation of CVE-2023-21716, a heap buffer overflow vulnerability in Microsoft Word's RTF parser. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 7

  • 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-2023-21716 — \fonttbl with 32768 entries critical CVE exact CVE_2023_21716
    RTF font table contains 32768 font entries, which is highly anomalous — CVE-2023-21716 triggers a heap buffer overflow in Word's RTF font table parser when the number of entries is very large (exploitable from ~32768 entries). This document is suspicious.
  • ClamAV: Doc.Dropper.Agent-7160437-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7160437-0
  • 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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \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 https://www.winusvlottery.com/temp/samoastag.hta 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_off00386b25.bin rtf-objdata-decoded RTF \objdata at offset 0x386B25 4664 bytes
SHA-256: c9c04173622b806f031477de6d0aee70046421c7a639c3e6f6be8dcba57a4372

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