Malicious RTF — malware analysis report

Static analysis result for SHA-256 f4802ec7ed4fe2fe…

MALICIOUS

RTF

3.45 MB Created: 2017-08-22 12:25:00 First seen: 2017-09-14
MD5: 1574a9df903342a090d32dc905a82007 SHA-1: a60bdf2d0d344f298cf0ef2e7afba837e47f3078 SHA-256: f4802ec7ed4fe2feb11582883a3d7c19ff37f077db4bd26633aa36057800d4ff
262 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document is weaponized with CVE-2017-0199, which is used to download and execute a second-stage HTA payload from the URL http://dl.asis.io/e93fyi6u.hta. Additionally, CVE-2023-21716 is triggered by an anomalous font table size, further indicating malicious intent. The embedded OLE object and ClamAV detection confirm its malicious nature.

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-7141444-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7141444-0
  • 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 http://dl.asis.io/e93fyi6u.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_off003496c4.bin rtf-objdata-decoded RTF \objdata at offset 0x3496C4 25182 bytes
SHA-256: 8bce461384d576fbc7da47a88500e71d7bb61b5150c5cfe125f8615b39b66ea5

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