Malicious RTF — malware analysis report

Static analysis result for SHA-256 c64834d68149c9fb…

MALICIOUS

RTF

846.1 KB First seen: 2019-01-20
MD5: f3b0e7cca74688900214746b82fd923a SHA-1: b45fe7838b76aef89ac31d9d804e634e536cb782 SHA-256: c64834d68149c9fba3daa9a0a86dc1294fc7c0000ebd5eda46e96d94023a21a1
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-2017-0199 and CVE-2017-8570. These vulnerabilities are known to be used for dropping and executing secondary payloads, often via OLE objects and Monikers. The embedded URL suggests the source of the secondary 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
  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • 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.Trojan.CobInt-6699264-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.CobInt-6699264-0
  • \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://www.krd.pl/ In 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 59596 bytes
SHA-256: f0534b9b62990369107478f6a5f2dd01e3dbacd02dbfd08afccba3fdc2e2f1b7
objdata_02_off00022320.bin rtf-objdata-decoded RTF \objdata at offset 0x22320 353996 bytes
SHA-256: 7bf17b5e11a741ebca9f604c708ce9066891accb88dc80932000aa827bb588b0
objdata_03_off000cf0f6.bin rtf-objdata-decoded RTF \objdata at offset 0xCF0F6 381 bytes
SHA-256: b16269ed74bbb54da900998b9d0ff6db6fa04de76d87c7ece4414f4b2b9dc5a1
objdata_04_off000cf424.bin rtf-objdata-decoded RTF \objdata at offset 0xCF424 790 bytes
SHA-256: ac6dd4416a3c69b34bc166b4ed3a98acdc14d43308526869ffa1b6809c8901d7
objdata_05_off000cfab7.bin rtf-objdata-decoded RTF \objdata at offset 0xCFAB7 2633 bytes
SHA-256: 1feb5f150bb35566d1a01fc59a357dc0ea34bc7498e0ec99bd939f6f848044b0
objdata_06_off000d0fc1.bin rtf-objdata-decoded RTF \objdata at offset 0xD0FC1 4806 bytes
SHA-256: 0b1f8c33edca54b24a7403860d908f696a2088e51becf7f2a5f61746c3dfc293

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