Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e1af9abb66ddbb90…

MALICIOUS

RTF / .DOC

24.4 KB
MD5: 28f3438b819c661e80e60de047720864 SHA-1: c663b615e4a864ed722dbc83b869bc25630107e7 SHA-256: e1af9abb66ddbb900bdc5cfe5177ccf976dc794e51e06d100708f0861452a140
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559.001 Component Object Model Hijacking T1059.001 PowerShell T1204.002 Malicious File

The file is an RTF document that leverages the Equation Editor vulnerability (CVE-2017-11882) to execute arbitrary code. The presence of RTF_EQUATION_EDITOR and CVE_2017_11882_ACTIVATION_RELATED heuristics strongly indicates this exploit. The RTF_OBJUPDATE heuristic further confirms that the embedded OLE object is designed to be activated, leading to code execution. No document body text was available for analysis, but the exploit itself is the primary attack vector.

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_off00001921.bin
1a947db94847e97d0d0614fee0d3e4eff320c277f610cf2c1a8ec5874ebb16e5		 rtf-objdata-decoded RTF \objdata at offset 0x1921 1801 bytes

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