Malicious RTF — malware analysis report

Static analysis result for SHA-256 229cd44d9e4ea6ed…

MALICIOUS

RTF

1.75 MB Created: 2026-01-27 07:43:00
MD5: 3fc5b1693ce48890f296ced690f503cc SHA-1: cf5fa002071479aa471a65b1b6ee5591310a87d2 SHA-256: 229cd44d9e4ea6ed95292ec3509e0053d1de8a3bbbc923096308866f6db300df
242 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell T1203 Exploitation for Client Execution

The RTF file contains multiple OLE object data sections with excessive hex-encoded data, indicative of a hidden payload. Critical heuristics identify exploitable vulnerabilities CVE-2026-21509 and CVE-2026-21514, related to Shell.Explorer.1 CLSID and Word/OLE security bypass respectively. ClamAV also detected this as Win.Exploit.CVE_2026_21514-10059348-0. The embedded URL http://192.168.217.250/scr2.rss is likely used to download a secondary stage. The document body content appears benign, suggesting the malicious functionality is entirely within the embedded objects and exploits.

Heuristics 7

  • 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 ~1689KB 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
  • 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/wo

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off001ac71b.bin
c668c224ae129e6e60c3560f871228379ef4771bbb049852dfc5d4b4c7db604d		 rtf-objdata-decoded RTF \objdata at offset 0x1AC71B 2809 bytes
objdata_01_off001add69.bin
62bd2022247bb97dced7b4ae2b734bde3bcbbf54ed3d6ef17eeb7471e83185b2		 rtf-objdata-decoded RTF \objdata at offset 0x1ADD69 2609 bytes
objdata_02_off001af30c.bin
3ab511c6448f8c0428cef7ad3cd443a22cbff185254f62ee3eb4196ac84c7138		 rtf-objdata-decoded RTF \objdata at offset 0x1AF30C 2609 bytes
objdata_03_off001b08c2.bin
09287a551626fbb376f0d40893eb8dc359d22f56c42f4ab3d75e66ec31cf5c99		 rtf-objdata-decoded RTF \objdata at offset 0x1B08C2 29044 bytes

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