Malicious RTF — malware analysis report

Static analysis result for SHA-256 1cc113504f88ad08…

MALICIOUS

RTF

46.9 KB First seen: 2019-12-09
MD5: 9affcf9de62449810cac56ac6ad333f8 SHA-1: 459269491626a62890bd07b24a6387b31ed7e7b9 SHA-256: 1cc113504f88ad085cd8a493274f95f8bdf20669616fff1929401dc1b58716aa
120 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object with a split Equation Editor ProgID, indicating exploitation of a known vulnerability. The \objupdate directive forces OLE activation, leading to arbitrary code execution. The file is classified as malicious due to this exploit.

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_off0000a6e0.bin rtf-objdata-decoded RTF \objdata at offset 0xA6E0 2408 bytes
SHA-256: 7bbf5d8ea5307f0c62fded4bb140ef119517ed963d36dfc633a76bb6724af568

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