Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 479fd5e5bd5566a0…

MALICIOUS

RTF / .DOC

2.56 MB Created: 2009-02-10 16:01:00 First seen: 2026-03-27
MD5: b006542082f921520f1f98819eadcecb SHA-1: a631fbe4544c1febe65b450c418e1c1b7261989f SHA-256: 479fd5e5bd5566a0252acd4ec29c5abc0dac501d0d6e9f316612b52aa48a3587
322 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell

The file is an RTF document that exploits multiple Microsoft Office vulnerabilities, including CVE-2017-8759, CVE-2026-21509, and CVE-2026-21514. These vulnerabilities are leveraged to embed OLE objects and potentially execute arbitrary code. The presence of an embedded URL pointing to 'http://192.168.217.250/scr2.rss' suggests a download and execution mechanism for a secondary payload. The document body, while in Ukrainian and discussing weather, is likely a lure to entice users to open the malicious attachment.

Heuristics 9

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • CVE-2026-21509 — Shell.Explorer.1 CLSID in RTF critical CVE related CVE_2026_21509
    RTF document contains the Shell.Explorer.1 CLSID {EAB22AC3-30C1-11CF-A7EB-0000C05BAE0B} associated with CVE-2026-21509 (OLE/COM Killbit / Protected View bypass). Actively exploited in the wild.
  • CVE-2026-21514 — Word/OLE security bypass in RTF high CVE likely CVE_2026_21514
    RTF document contains an embedded Word package with a webSettings frame relationship to a local Windows diagnostics XML target. That matches observed CVE-2026-21514 exploitation, where crafted Word/OLE metadata bypasses Office security decisions when opened.
  • ClamAV: Win.Exploit.CVE_2026_21514-10059348-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Exploit.CVE_2026_21514-10059348-0
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~2133KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 4 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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://192.168.217.250/scr2.rss
    • http://schemas.microsoft.com/office/word/2003/wordml}{\xmlns2

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0027c856.bin
b4d139bb6ef08e5751b0d069163234cc7999295e83455d3c200e148424f1d8f3		 rtf-objdata-decoded RTF \objdata at offset 0x27C856 2809 bytes
objdata_01_off0027df02.bin
3be110f6b81e7b85093146a7e945ebd3491c036591574301e38a68a4e20069ea		 rtf-objdata-decoded RTF \objdata at offset 0x27DF02 2609 bytes
objdata_03_off00280ab9.bin
09287a551626fbb376f0d40893eb8dc359d22f56c42f4ab3d75e66ec31cf5c99		 rtf-objdata-decoded RTF \objdata at offset 0x280AB9 29044 bytes

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