Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 525713ffe4c03fe2…

MALICIOUS

RTF / .DOC

637.0 KB
MD5: d0bcf2abfdae2e50aa84dbd4306f1df4 SHA-1: 6626b156df2f774dc333055abe9e396dcbcb4418 SHA-256: 525713ffe4c03fe29b85cfa361c9dab30e001e497b3b73c05b77a3781782335b
162 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that is automatically updated and activated, indicating an attempt to exploit vulnerabilities. Specifically, the RTF_EQUATION_EDITOR heuristic strongly suggests the use of the Equation Editor vulnerability (CVE-2017-11882). The extracted artifact 'objdata_00_off00001e6a.bin' is likely the payload delivered by this exploit. The file is classified as malicious, supporting the conclusion that it's designed for exploitation.

Heuristics 5

  • 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
  • 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 1 \objdata section(s) — embedded OLE objects
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001e6a.bin
d273512e00b1f9f17d4b61e0a22752c4b85463c0ce0eac66402b1d5ada8e0609		 rtf-objdata-decoded RTF \objdata at offset 0x1E6A 129079 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.97, consistent with packed or encrypted content.

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