Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 c51ff8fa48218695…

MALICIOUS

RTF / .DOC

20.1 KB
MD5: b4666a15a631c50fcbbbdd013d71c81b SHA-1: 2c7137414c9c3c5d2cd7101ff01414ae74456734 SHA-256: c51ff8fa48218695ec07b3eb1e3fcdeb479e1a6b0841dd85c6542e4154889668
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model

The RTF document contains embedded OLE objects, specifically triggering the Equation Editor vulnerability (CVE-2017-11882). This indicates an attempt to exploit the Equation Editor to achieve arbitrary code execution upon opening the document. No document body or script content was available for further analysis.

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.
  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000015b2.bin
72e5a818fecaa597930b1dc234446b79db217cfa5b34ee13dd5f854fdefc97dc		 rtf-objdata-decoded RTF \objdata at offset 0x15B2 1941 bytes

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