Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 61068a79546e2680…

MALICIOUS

RTF / .DOC

4.3 KB
MD5: 765bfb0f4dfaec733a410c47fcc35737 SHA-1: 774f7bfafe7469b2d5816e7dc0c5e8ea91b161be SHA-256: 61068a79546e26804763319a49f7777a2985f4dcdd2a7cccea1a5734322d6eff
200 Risk Score

Malware Insights

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

The RTF document contains embedded OLE object data, specifically related to Equation Editor. High and critical heuristics indicate the presence of a known vulnerability, CVE-2017-11882, which is commonly exploited to achieve arbitrary code execution. The file is classified as malicious, and the exploit is likely delivered via spearphishing.

Heuristics 5

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • 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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000cb.bin
50b6f3eb57f33f06991f8795030b27d0a91fc424b143b16e317486800706a211		 rtf-objdata-decoded RTF \objdata at offset 0xCB 1929 bytes

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