Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 766d558c9a0c4d1d…

MALICIOUS

RTF / .DOC

3.07 MB
MD5: f33a4758db1d754b3cd3b90e8386d7c7 SHA-1: c3d71be75d3b181d5852059452b0ac06801ea815 SHA-256: 766d558c9a0c4d1d0ee79099df73fc780d6d3537ea68571e03d1690618d247af
242 Risk Score

Malware Insights

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

The RTF file contains multiple indicators of exploitation, including OLE object data, Equation Editor CLSID, and excessive hex data within objdata sections. These heuristics strongly suggest the file is designed to exploit a vulnerability, likely via a spearphishing attachment, to execute a payload. The embedded URL, though marked benign, is included as a potential IOC.

Heuristics 7

  • 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.
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1614KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bit.ly/2TE7JJq

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00189c67.bin
3d9c4103c4517ccdb0c838d01c889e3488e7ae32cfead8687a7db4385af5694e		 rtf-objdata-decoded RTF \objdata at offset 0x189C67 801872 bytes

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