Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 723a51d23ac692e3…

MALICIOUS

RTF / .DOC

21.5 KB
MD5: 6b4639be8a05b391b2d06e2583a6ad80 SHA-1: 1dc99d3c2c188750d8a2932342d9b2dc8a87d67f SHA-256: 723a51d23ac692e3d1968e087a06db3957fef9ce95ae934bfbf09b354c33e798
200 Risk Score

Malware Insights

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

The sample is an RTF document containing embedded OLE objects, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. This indicates the file is designed to exploit this known vulnerability for client-side code execution. The presence of ".objupdate" further suggests an attempt to force OLE object activation, likely to trigger the exploit and download a secondary payload.

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_off000016fc.bin
fe7079e72a0bc0beb33e81407ef28bec84703a3235510671b55a96dbf50d20ad		 rtf-objdata-decoded RTF \objdata at offset 0x16FC 1550 bytes

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