Malicious RTF — malware analysis report

Static analysis result for SHA-256 4078085b2e762aef…

MALICIOUS

RTF

3.4 KB First seen: 2019-05-16
MD5: e8c09edea0d5ae6dfd354222e85a78f0 SHA-1: f507babd21f26c87d250d3a1337c5fa5251fa0df SHA-256: 4078085b2e762aefe1b2484f6ed2d24f874dac90ad233a5a831defadfacd8a88
120 Risk Score

Malware Insights

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

The RTF file contains heuristics indicating the exploitation of the Equation Editor (RTF_EQUATION_EDITOR) and forces OLE object activation (RTF_OBJUPDATE). This suggests the file is designed to exploit a client-side vulnerability for code execution, likely as a spearphishing attachment. The embedded OLE object data (RTF_OBJDATA) further supports this, as it often contains malicious payloads.

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_off0000003b.bin rtf-objdata-decoded RTF \objdata at offset 0x3B 1710 bytes
SHA-256: 5b78c575cb62b664859079dc2f6acbff211370ed562c16adab6fdc8287639bc2

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