Malicious RTF — malware analysis report

Static analysis result for SHA-256 b4d9c31cb14ab807…

MALICIOUS

RTF

304.8 KB
MD5: c76b208f96c6a7fd5db98ad330dd1723 SHA-1: 590d169bb4230ddc51e3df0ec0d7cdc4d842eb06 SHA-256: b4d9c31cb14ab80709bce2f48870c1f3f2d8296a1df648e4992be0b5501243fd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The RTF file contains multiple OLE objects, including embedded OLE objects and OLE activation triggers. The document body explicitly instructs the user to 'Enable Editing', a common lure to bypass macro security. This suggests the file is designed to exploit OLE object vulnerabilities or execute embedded code upon user interaction.

Heuristics 6

  • 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.
  • \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 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000b44.bin
8af9fd9b5450450bb7d4ac5a8bf215da827c1499fe99ed3b9fd15e6a678b3b36		 rtf-objdata-decoded RTF \objdata at offset 0xB44 59942 bytes
objdata_01_off0001e095.bin
12289ea42203fe86d5d6e86e52672f752ead5709842d0443203b40a4917d5ece		 rtf-objdata-decoded RTF \objdata at offset 0x1E095 12261 bytes
objdata_02_off000240a5.bin
5de732ece55617b212baa0db7102c497ed7e809d372953a6a31ff14adb5754f5		 rtf-objdata-decoded RTF \objdata at offset 0x240A5 2632 bytes

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