Malicious RTF — malware analysis report

Static analysis result for SHA-256 1f068707a8e2353e…

MALICIOUS

RTF

22.2 KB First seen: 2020-09-07
MD5: 0fbbc5b0b3cf14e7a5e064f8ca4e17ed SHA-1: 0ebdf39cc54104b4e2fef539eedf39114a77e195 SHA-256: 1f068707a8e2353e48ef4e92584b2cf7c7d70ebb01105335128f316deccf13f7
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains embedded OLE object data and triggers heuristics for Equation Editor exploitation and OLE object activation. This indicates the file is designed to exploit a vulnerability in the Equation Editor component to execute arbitrary code, likely leading to the download of a secondary payload.

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_off000020e0.bin rtf-objdata-decoded RTF \objdata at offset 0x20E0 1607 bytes
SHA-256: 84c680e52f8af494dea647fdfccdc0dc48085b4155d9fe590ca1a416e25a3ba1

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