Malicious RTF — malware analysis report

Static analysis result for SHA-256 27bdd3b800ed7059…

MALICIOUS

RTF

1.60 MB
MD5: 0175b530eec362bcd775b43b6b582ad2 SHA-1: cffff0d1103448de1e0a078b31a4dc4b88d39b5e SHA-256: 27bdd3b800ed7059278cd0cb0d9fb7aa6581f96fa786f2d3429b3b9688765e10
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability via the Equation Editor. This exploit allows for arbitrary code execution when the document is opened. The embedded object data and heuristics strongly indicate this exploit is being leveraged.

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
1cfbcae06f25d805261ba6d1731a783f5bc79b94d79367fc78db7d33d1967082		 rtf-objdata-decoded RTF \objdata at offset 0x11E1 55973 bytes
objdata_01_off000333f3.bin
078f4826f1fd7ea74b366f8203fc5dc103f9012dddd7cede4b9d1d69bc7eed6c		 rtf-objdata-decoded RTF \objdata at offset 0x333F3 351910 bytes

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