Malicious RTF — malware analysis report

Static analysis result for SHA-256 cbd1ce9769c680c8…

MALICIOUS

RTF

4.0 KB First seen: 2019-11-20
MD5: d79d61a958950eb0e1a83887cd2cdaa2 SHA-1: c2f8fb4cfa97dc5f3d25c16761c393a581195ae8 SHA-256: cbd1ce9769c680c88b47c0ab2890479b0902e62540320a4b00f89166a7421be6
180 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object and specifically triggers heuristics related to the Equation Editor vulnerability. This indicates the file is designed to exploit a known vulnerability for client execution. The ClamAV detection as Rtf.Dropper.Agent-7114711-0 further supports its malicious nature as a dropper.

Heuristics 4

  • 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.
  • ClamAV: Rtf.Dropper.Agent-7114711-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7114711-0
  • \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_off0000006b.bin rtf-objdata-decoded RTF \objdata at offset 0x6B 1860 bytes
SHA-256: 2cce359dcee179b6282420e3cec7c8bf7e3a9b646570963468d660f242de6b33

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