Malicious RTF — malware analysis report

Static analysis result for SHA-256 d22b57b0b22764d9…

MALICIOUS

RTF

1.69 MB First seen: 2020-02-04
MD5: f764561bd26dd95f46575d48f09fafe5 SHA-1: 4e6b418983ac0d5be7ebad6bbf73c4a20056bc04 SHA-256: d22b57b0b22764d98901bbba88c116bddb1619ef61a9ce4f397ef5c0cdbec7c2
404 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of malicious activity, including embedded OLE objects with excessive hex data and a composite moniker related to CVE-2017-8570. This exploit is known to drop SCT scripts, which are then likely executed to download and run a secondary payload. The presence of a PE header within the hex data further suggests a packed or obfuscated executable payload.

Heuristics 11

  • Composite Moniker — CVE-2017-8570 (drops SCT script) critical CVE related CVE_2017_8570
    RTF \objdata decodes to OLE data containing the Composite Moniker — CVE-2017-8570 (drops SCT script) 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.
  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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.
  • ClamAV: Rtf.Dropper.Agent-9965975-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-9965975-1
  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1611KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 7 \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.
  • 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.openxmlformats.org/drawingml/2006/main In RTF body

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000031.bin rtf-objdata-decoded RTF \objdata at offset 0x31 805580 bytes
SHA-256: 51a72dfab363c861d2f530e0a2c60db84f962ee9ff7f52f7a6dc97cddb842b45
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.92, consistent with packed or encrypted content.
objdata_01_off001a277f.bin rtf-objdata-decoded RTF \objdata at offset 0x1A277F 22220 bytes
SHA-256: 16787d507985b28622bedd3d87024cb269e578980dc4f1e5784680d16f5329ba
objdata_02_off001ad54f.bin rtf-objdata-decoded RTF \objdata at offset 0x1AD54F 382 bytes
SHA-256: 9d6fa4be1a4a694cfee89268078c9efc8705b1a473fbb09a37ceb2d45104e44b
objdata_03_off001ad887.bin rtf-objdata-decoded RTF \objdata at offset 0x1AD887 789 bytes
SHA-256: 8ab026a3e66d94feae5647d5ac6558412271b58006835755f301bcce43b1e52a
objdata_04_off001adf2f.bin rtf-objdata-decoded RTF \objdata at offset 0x1ADF2F 2633 bytes
SHA-256: 1feb5f150bb35566d1a01fc59a357dc0ea34bc7498e0ec99bd939f6f848044b0
objdata_05_off001af457.bin rtf-objdata-decoded RTF \objdata at offset 0x1AF457 4679 bytes
SHA-256: 6bb172535cccd16de71bca846e2bb6df177c56b3a545d6e6314435eabf5d2217

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