Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a839a5eefd12c85e…

MALICIOUS

RTF / .DOC

38.2 KB
MD5: 94f9fbd1ec7f1138514bf3d57533736f SHA-1: 109cec453478ec1a94fdb66b9bdec2d23c4d361c SHA-256: a839a5eefd12c85e59eae1e12deab8fd9a1d5d35e75fdaac401692e2ad0059e0
180 Risk Score

Malware Insights

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

The RTF document contains embedded OLE object data, specifically triggering the CVE-2017-11882 vulnerability related to Equation Editor. This indicates an attempt to exploit a known vulnerability for code execution. The presence of multiple OLE objects and the explicit mention of Equation Editor activation strongly suggest this 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_off00000fc7.bin
ad83dc950fa78c66b5c025b99d4c6c483c69e1a39b0ac013a1b61b4fc44e0802		 rtf-objdata-decoded RTF \objdata at offset 0xFC7 1480 bytes

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