Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 72a959105f9b0f79…

MALICIOUS

RTF / .DOC

213.4 KB
MD5: 99dfece0a25e95aa3378c3e9e3c9f7a1 SHA-1: 7d44d4f23ec77b88038b1ea39b3eb2adfb27a297 SHA-256: 72a959105f9b0f7974ea6c2c73a211ec87e6eb78bb4723a1051832bda7307709
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The RTF document contains OLE object data and triggers heuristics related to CVE-2017-8570, which is known to drop SCT scripts. The presence of \objupdate and a Composite Moniker strongly suggests an attempt to exploit this vulnerability for execution. The document body explicitly prompts the user to 'Enable Editing', indicating a lure to bypass macro security settings.

Heuristics 7

  • 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.
  • 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 3 \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_off00000bd0.bin
7dfeba87c093b6236bc6d1aa223b607a0571baac4d5ea8cfb6abaf63bad29333		 rtf-objdata-decoded RTF \objdata at offset 0xBD0 12906 bytes
objdata_01_off00007249.bin
0d5d09fb7e87d140659b8f662dc3a7b92cd848450a431d1974047996c57d1f01		 rtf-objdata-decoded RTF \objdata at offset 0x7249 2632 bytes
objdata_02_off000087e4.bin
cfdf79b95584afe599f8bd01e391d8904839d9495e407a353433d3f5e3be3602		 rtf-objdata-decoded RTF \objdata at offset 0x87E4 12261 bytes

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