Malicious RTF — malware analysis report

Static analysis result for SHA-256 6e3d28e3efee275a…

MALICIOUS

RTF

3.8 KB
MD5: 8aa089cf04c5fad4da47736f639a663a SHA-1: 13226a5bb125affe9a1affa7c599059396805d91 SHA-256: 6e3d28e3efee275a77f24cdca9a7053e0e321c4c37c292e613807da092e063b0
120 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and specifically triggers heuristics related to the Equation Editor vulnerability. This indicates the file is designed to exploit a known vulnerability to achieve code execution upon opening. The presence of ".objupdate" further suggests an attempt to force OLE object activation, likely to trigger the exploit.

Heuristics 3

  • Split hex Equation Editor ProgID + OLE object critical 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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000ae.bin
6230c482688a24fe171791a162bfbd9f98f97bc64fe1bf8e22325f50543932bd		 rtf-objdata-decoded RTF \objdata at offset 0xAE 1756 bytes

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