Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 638c7d6859e792cc…

MALICIOUS

RTF / .DOC

213.0 KB
MD5: 7ee9f7dd82092fd7fbca3df11d3bc5fa SHA-1: f49222ec7e912e8f65b2c8518ddd58940753a7f8 SHA-256: 638c7d6859e792cc15836509bd58bf468b755fee3dcf669d2dcf328dd0029f12
220 Risk Score

Malware Insights

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

The RTF document contains multiple OLE objects and triggers heuristics related to CVE-2017-8570, which is known to drop SCT scripts. The document body contains a lure instructing the user to 'Enable Editing', indicating an attempt to bypass security measures and execute embedded content. The primary attack vector appears to be exploiting a vulnerability to execute a script.

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_off00000bd2.bin
bc76f2985506ab3727ab53fbf2afb76fccd0aa1556542ecce55580b2ae39ad6a		 rtf-objdata-decoded RTF \objdata at offset 0xBD2 12897 bytes
objdata_01_off0000710c.bin
efcad781cab3d633c5a53c0b86b2c30761dd037463d8eb36ded19f59f1126d89		 rtf-objdata-decoded RTF \objdata at offset 0x710C 2632 bytes
objdata_02_off000086a7.bin
cfdf79b95584afe599f8bd01e391d8904839d9495e407a353433d3f5e3be3602		 rtf-objdata-decoded RTF \objdata at offset 0x86A7 12261 bytes

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