Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 82c1e797a0442853…

MALICIOUS

RTF / .DOC

260.9 KB
MD5: 9bc34d020ac14436fb747f6defcd1e4e SHA-1: 029e3523dee8bffbc6ed9a3875cf959a044469d2 SHA-256: 82c1e797a0442853b6723c8068126dfa525ea4a0b895454a384d0e12b14fde1c
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 also contains a lure instructing the user to 'Enable Editing', indicating an attempt to bypass security measures and execute embedded content. The exploitation of CVE-2017-8570 likely leads to the execution of a script, which is then used to download and execute a secondary payload.

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 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_off00000b63.bin
dc27713bec8536cbce645c60f6f336b4977f64e6dfc3d9c3b15c0458816f3292		 rtf-objdata-decoded RTF \objdata at offset 0xB63 37488 bytes
objdata_01_off00013148.bin
12289ea42203fe86d5d6e86e52672f752ead5709842d0443203b40a4917d5ece		 rtf-objdata-decoded RTF \objdata at offset 0x13148 12261 bytes
objdata_02_off00019158.bin
82ad79f62d6dfc14694497a9a15cafc0d7d55f5ec8ce91df6ced1e7f663a3922		 rtf-objdata-decoded RTF \objdata at offset 0x19158 2632 bytes

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