Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a09becacb952e741…

MALICIOUS

RTF / .DOC

2.20 MB
MD5: 84f757ae9d86e1a5bbd1974375867973 SHA-1: b4c5e7f2f790cc52e67977257d71592d1df7de41 SHA-256: a09becacb952e741601eb234fce7d2e74c27a9c04735c0fcffb89ace49765087
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

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 a vulnerability in Microsoft Equation Editor for arbitrary code execution. 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000011e1.bin
5ae74cdade2cae5f4df1925d8f3fcd13f5e05a3b2a40daf5c3b96e8fa79be919		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 47855 bytes
objdata_01_off0002af5a.bin
1dff60c32303d58fd426d1215689e547377c88210d425e277a4a202bc2e03050		 rtf-objdata-decoded RTF \objdata at offset 0x2AF5A 543771 bytes

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