Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e8559518eacba671…

MALICIOUS

RTF / .DOC

260.9 KB
MD5: 2c772a77e6fdd1d7f9a25981d0a21226 SHA-1: 98b16de07d7ce478343e768d162789fa12a4c174 SHA-256: e8559518eacba671dff1cd91eb855d3d180df3e936256318a608c407e6f0ad77
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains multiple OLE objects and uses an 'Enable Editing' lure, indicating an attempt to bypass macro security and execute embedded content. The presence of `RTF_OBJUPDATE` and `RTF_COMPOSITE_MONIKER_RELATED` heuristics strongly suggests the OLE object is designed to be activated, likely to download and execute a secondary payload. No scripts were extracted, and no specific IOCs were directly identifiable from the provided evidence.

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_off00000b63.bin
d9e23d4ffe236c455d607af7739fa337310f5dcea75444ff514426927a389da4		 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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