Malicious RTF — malware analysis report

Static analysis result for SHA-256 8c4a534661e4e200…

MALICIOUS

RTF

937.3 KB First seen: 2019-12-09
MD5: 7a02fc1d1ec7e6fd74c4862c451fc74e SHA-1: 0a0571b4c76643c5ee1df59017f205b4c73f7690 SHA-256: 8c4a534661e4e200d2ec88fa13ba17f0942c849cae55cdf763f495ee70a415c7
362 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple critical heuristic firings indicating exploitation of CVE-2017-8570, which is known to drop and execute a script. The presence of OLE object data and a Composite Moniker further supports this attack vector. The embedded script is likely responsible for downloading and executing a second-stage payload.

Heuristics 9

  • 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.
  • 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.
  • 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 438476 bytes
SHA-256: 6d3ee7c08d984d8f9c6066d746d157d3eb8031e87644a701cb60680733ad556a
objdata_01_off000dac01.bin rtf-objdata-decoded RTF \objdata at offset 0xDAC01 22732 bytes
SHA-256: 72bd6d08688b136445d46e0b1b1bd342498a8284fb27dd5dc615764bd27521c8
objdata_02_off000e5dd1.bin rtf-objdata-decoded RTF \objdata at offset 0xE5DD1 462 bytes
SHA-256: 1fc984b84321e6a82ecaf923edd7fcaabe8ab7934f072eb0370458c42b90210d
objdata_03_off000e61a9.bin rtf-objdata-decoded RTF \objdata at offset 0xE61A9 877 bytes
SHA-256: 76f3e5239d2c790a4fec1d75e41e3216cf3d21a28661c8e5153da071db1826f7
objdata_04_off000e6901.bin rtf-objdata-decoded RTF \objdata at offset 0xE6901 2247 bytes
SHA-256: 992c836552ac8953ea96f98fe3fdf2f015904931030078610b1ec4c608451d62
objdata_05_off000e7b25.bin rtf-objdata-decoded RTF \objdata at offset 0xE7B25 4679 bytes
SHA-256: a031167f29c59aa6f60f009231ba4b3342834ba008154b405252e98bc2ed362a

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