Malicious RTF — malware analysis report

Static analysis result for SHA-256 dd4178a6c9ee9f39…

MALICIOUS

RTF

1.76 MB First seen: 2019-01-12
MD5: 2d22f1cf447359966aa8fbd7c9e4275b SHA-1: 4f8d312a381cb95606125ca12cfd9dbd12798928 SHA-256: dd4178a6c9ee9f399024e6990a419c17d1b3ccdb38222b01ca04fcfa22fac753
442 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 via the Equation Editor component. This vulnerability is known to drop a SCT script, which likely contains shellcode and is responsible for executing a secondary payload. The presence of PE headers within hex data further supports the payload delivery mechanism.

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 ~1831KB of hex-encoded data inside \objdata sections — may hide a payload
  • Suspicious extracted artifact high 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.
  • 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/officeDocument/2006/bibliography In RTF body
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn RTF body
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn RTF body

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00004a21.bin rtf-objdata-decoded RTF \objdata at offset 0x4A21 884 bytes
SHA-256: 08cb831cfd094f7193857584f98ebb419e336c73f0191f78a94fb322b6fcad85
objdata_01_off00005155.bin rtf-objdata-decoded RTF \objdata at offset 0x5155 100044 bytes
SHA-256: 2ebd21766daef37fce64b8a10b6642481ac67d2583f6c14a0ccf856fef16ce39
objdata_02_off00035f20.bin rtf-objdata-decoded RTF \objdata at offset 0x35F20 805580 bytes
SHA-256: 3cad4bcb8a89bf286111681143b42661c52fa4bcfbe1328a65b0ffad314e550c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered command string(s): CScript TLGs.
objdata_03_off001bf4f6.bin rtf-objdata-decoded RTF \objdata at offset 0x1BF4F6 381 bytes
SHA-256: b16269ed74bbb54da900998b9d0ff6db6fa04de76d87c7ece4414f4b2b9dc5a1
objdata_04_off001bf824.bin rtf-objdata-decoded RTF \objdata at offset 0x1BF824 790 bytes
SHA-256: ac6dd4416a3c69b34bc166b4ed3a98acdc14d43308526869ffa1b6809c8901d7
objdata_05_off001bfeb7.bin rtf-objdata-decoded RTF \objdata at offset 0x1BFEB7 2633 bytes
SHA-256: 1feb5f150bb35566d1a01fc59a357dc0ea34bc7498e0ec99bd939f6f848044b0
objdata_06_off001c13c1.bin rtf-objdata-decoded RTF \objdata at offset 0x1C13C1 4806 bytes
SHA-256: 0b1f8c33edca54b24a7403860d908f696a2088e51becf7f2a5f61746c3dfc293

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