Malicious RTF — malware analysis report

Static analysis result for SHA-256 dc262ce36c53fed0…

MALICIOUS

RTF

1.41 MB Created: 2020-10-23 05:41:00
MD5: d3b96b5fd14deda589d88bbb6608d4e7 SHA-1: fc0995f053cac07f4cd17b956f129903c1ae108f SHA-256: dc262ce36c53fed0025f3742f6f1724b2f11968a35dfe922c004887555461d6b
282 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF file contains critical heuristics indicating the exploitation of Microsoft Equation Editor (RTF_EQUATION_EDITOR, RTF_OBJCLASS_EQUATION). This is further supported by heuristics related to OLE object data and composite monikers, suggesting the embedding of a malicious object. The presence of excessive hex data within the OLE object points to a hidden payload. The file is classified as malicious due to these indicators, likely serving as a delivery mechanism for further exploitation.

Heuristics 9

  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • CVE-2026-21514 — Word/OLE security bypass in RTF high CVE likely CVE_2026_21514
    RTF document contains an embedded OLE object with an Ole10Native stream. CVE-2026-21514 exploits OLE stream metadata validation in Word; the Ole10Native stream is used to deliver payloads and trigger the bypass when the document is opened.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1434KB 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 OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000063a0.bin
39f2c391e303df6e3668f3be27495cfe1580a81cfd91f32a1f8ec9ae24fe323e		 rtf-objdata-decoded RTF \objdata at offset 0x63A0 711724 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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