Malicious RTF — malware analysis report

Static analysis result for SHA-256 97be9240611bbc22…

MALICIOUS

RTF

1.87 MB First seen: 2019-05-16
MD5: c71fc6c5f5fc425711395ee969effa95 SHA-1: d2338badc697f25b8bcd774eb2e42f50707c52d4 SHA-256: 97be9240611bbc22a1716680107b15065ba96c93469236741a2b487b0047c06f
462 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains multiple indicators of exploitation, including OLE object data, a composite moniker, and excessive hex data, strongly suggesting the use of CVE-2017-8570. This vulnerability is known to drop SCT scripts, which are then executed. ClamAV detections of 'Win.Packed.Noon-7346829-0' on both the primary file and an extracted artifact confirm its malicious nature and packed payload.

Heuristics 10

  • 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-7346829-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Packed.Noon-7346829-0
  • 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 ~1937KB 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.
  • 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://www.usertrust.com1 In RTF body
    • http://ocsp.usertrust.com0In RTF body
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn RTF body
    • http://schemas.microsoft.com/sharepoint/v3/contenttype/formsIn RTF body
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn RTF body
    • http://crl.usertrust.com/UTN-USERFirst-Object.crl05In 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_off000d0753.bin rtf-objdata-decoded RTF \objdata at offset 0xD0753 37580 bytes
SHA-256: 6dd8f4633cae0df41105e3ce7acf03ba77aad7136dd9dd8652bdc471eb54dbbf
objdata_02_off000e2d1e.bin rtf-objdata-decoded RTF \objdata at offset 0xE2D1E 504324 bytes
SHA-256: ba89724f7cbdf4383c5e4d71013c781018eeaeb20a7cf44b20515eceff6ad7a8
Detection
ClamAV: Win.Packed.Noon-7346829-0
Obfuscation or payload: unlikely
objdata_03_off001d9164.bin rtf-objdata-decoded RTF \objdata at offset 0x1D9164 382 bytes
SHA-256: 7c829894502990522aaee3764e10dad03b3c7476dec48c4e1d128bb9b9774910
objdata_04_off001d9494.bin rtf-objdata-decoded RTF \objdata at offset 0x1D9494 789 bytes
SHA-256: 87caf099a20fd4563d975979583365d98bc376a5fd992193cf5da7686fc18198
objdata_05_off001d9b25.bin rtf-objdata-decoded RTF \objdata at offset 0x1D9B25 2633 bytes
SHA-256: 1feb5f150bb35566d1a01fc59a357dc0ea34bc7498e0ec99bd939f6f848044b0
objdata_06_off001db02f.bin rtf-objdata-decoded RTF \objdata at offset 0x1DB02F 4679 bytes
SHA-256: 0e2ce9d01b0df41beca1d9d003ff4bfe3998a96192a53992dd35145a081e0a27

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