Malicious RTF — malware analysis report

Static analysis result for SHA-256 258333614188ca59…

MALICIOUS

RTF

10.7 KB First seen: 2020-09-24
MD5: 0f12dbebb691cf51c4252d6399c00005 SHA-1: a0d7d7db03ef6366e0d83672b4ba87c60832f495 SHA-256: 258333614188ca5917b2fed7f4dedbf5fa87753820cc92e1ae35a0fd69e62ee9
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that exploits a known vulnerability in the Equation Editor (RTF_EQUATION_EDITOR, RTF_OBJUPDATE). This exploit is designed to execute arbitrary code, likely downloading and running a second-stage payload. The presence of OLE object data further supports this attack vector.

Heuristics 3

  • Split hex Equation Editor ProgID + OLE object critical CVE likely 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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001916.bin rtf-objdata-decoded RTF \objdata at offset 0x1916 2038 bytes
SHA-256: dfc274250ab5c26b5072d98faf8af543d1d241c39eba9c4852f72cd4bc177eb9

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