Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e8a3d587827e4971…

MALICIOUS

RTF / .DOC

229.2 KB
MD5: b26cee301381a70f38b4e5662abbaba7 SHA-1: ce05486ed48b2f2afe3462417501042c4d169d11 SHA-256: e8a3d587827e4971f80107e3bf3ed908dd4a53d78f550f695d2617256225d442
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The RTF document contains multiple OLE objects, with specific heuristics indicating automatic linking and an update trigger designed to activate the embedded content. This strongly suggests a lure to execute embedded code, bypassing security measures. The presence of multiple ".bin" files extracted from the OLE objects further supports the idea of a multi-stage delivery mechanism. Without a document body or script content, the exact payload and delivery method remain unclear, but the technique points towards a downloader or dropper.

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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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
  • 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_off00000965.bin
5564c97508ead5e7826c1229658a6ca723a573ff9cd7c3cd52751d4d2c1c5659		 rtf-objdata-decoded RTF \objdata at offset 0x965 20579 bytes
objdata_01_off0000b13a.bin
1af484323aa51f0bc067b498458ed2106db428c7b743185ac9a6e18e7b648e31		 rtf-objdata-decoded RTF \objdata at offset 0xB13A 2632 bytes
objdata_02_off0000c6dd.bin
44deae4627fee3c44f54d5bd10477ec2e17f4c08135f08e2417832e36d10d037		 rtf-objdata-decoded RTF \objdata at offset 0xC6DD 12297 bytes

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