Malicious RTF — malware analysis report

Static analysis result for SHA-256 a7f223fece38225d…

MALICIOUS

RTF

3.45 MB Created: 2017-08-22 11:12:00 First seen: 2017-08-27
MD5: 7562602496f8a23b908853e75cff5589 SHA-1: 4c57d76d4b945a30f60f29d7a9b1d16a3a069b56 SHA-256: a7f223fece38225d351e1eefcdfbb10951a8be4e662399ae954071e70b500dc8
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: 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.
  • 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_off0034968a.bin rtf-objdata-decoded RTF \objdata at offset 0x34968A 25182 bytes
SHA-256: 2eb8bd67e996bc367958c2bc2d44913008f1f64b60eb1df12a698edabf8fb34f

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