Malicious RTF — malware analysis report

Static analysis result for SHA-256 90da2514602fc0a2…

MALICIOUS

RTF

1.17 MB First seen: 2019-04-18
MD5: 8714fb6f4e6413b63fe5e21ee6da3ef2 SHA-1: b3de513fb4712ae0e13a22832915dbe6cff30f3e SHA-256: 90da2514602fc0a2f7fbbee7de06e8047929d587db8a3b33ebd2b2f5986c2fdf
464 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple critical heuristics indicating exploitation of CVE-2017-8570 through a composite moniker and OLE object data. ClamAV detections for Win.Packed.Noon-9654386-0 on both the main file and an extracted artifact suggest a packed executable payload is likely dropped and executed. The embedded URLs are confirmed benign and do not appear to be part of the malicious chain.

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: Win.Packed.Noon-9654386-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Packed.Noon-9654386-0
  • 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 ~1205KB 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 https://www.globalsign.com/repository/03 In RTF body
    • http://crl.globalsign.net/root.crl0In RTF body
    • https://www.globalsign.com/repository/0In RTF body
    • http://crl.globalsign.com/gs/gstimestampingg2.crl0TIn RTF body
    • http://secure.globalsign.com/cacert/gstimestampingg2.crt0In RTF body

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000002c.bin rtf-objdata-decoded RTF \objdata at offset 0x2C 884 bytes
SHA-256: 08cb831cfd094f7193857584f98ebb419e336c73f0191f78a94fb322b6fcad85
objdata_01_off000346e9.bin rtf-objdata-decoded RTF \objdata at offset 0x346E9 10956 bytes
SHA-256: 30a6c3878fb6fc0aa5a08f5a95c59db13318e972ee92653e6202c58f8eadf360
objdata_02_off00039cb4.bin rtf-objdata-decoded RTF \objdata at offset 0x39CB4 484652 bytes
SHA-256: 3de189541d68c502faafa828a24c60eb76f470abd0008dbb8778f0beea38ac13
Detection
ClamAV: Win.Packed.Noon-9654386-0
Obfuscation or payload: likely
Carved artifact entropy is 7.61, consistent with packed or encrypted content.
objdata_03_off0012674a.bin rtf-objdata-decoded RTF \objdata at offset 0x12674A 382 bytes
SHA-256: 7c829894502990522aaee3764e10dad03b3c7476dec48c4e1d128bb9b9774910
objdata_04_off00126a7a.bin rtf-objdata-decoded RTF \objdata at offset 0x126A7A 789 bytes
SHA-256: 87caf099a20fd4563d975979583365d98bc376a5fd992193cf5da7686fc18198
objdata_05_off0012710b.bin rtf-objdata-decoded RTF \objdata at offset 0x12710B 2633 bytes
SHA-256: 1feb5f150bb35566d1a01fc59a357dc0ea34bc7498e0ec99bd939f6f848044b0
objdata_06_off00128615.bin rtf-objdata-decoded RTF \objdata at offset 0x128615 4679 bytes
SHA-256: 0e2ce9d01b0df41beca1d9d003ff4bfe3998a96192a53992dd35145a081e0a27

Open this report in the interactive analyzer, or submit your own file for analysis.