Malicious RTF — malware analysis report

Static analysis result for SHA-256 31f6ea03cb0a23fc…

MALICIOUS

RTF

27.3 KB First seen: 2022-11-09
MD5: 0e67fd6d2c8088feddd2322cbfee178c SHA-1: 7f2f1c00fdf88752f47d91e3f5373f53343ac740 SHA-256: 31f6ea03cb0a23fc3fe828f8a5bb1829d3cafa258c42dff0327fe4bbca1b09eb
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The RTF file contains an embedded OLE object specifically identified as related to CVE-2017-11882, exploiting the Equation Editor vulnerability. The presence of \objupdate and the ProgID 'EquaTIOn.3' strongly indicate an attempt to trigger code execution. The document body's lure to 'Enable editing' further supports this, suggesting the exploit is intended to bypass security measures and likely download a secondary payload.

Heuristics 6

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • 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 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00005250.bin
7cc81c7cea282e121a8c86edf8ee4ecba8c20c184b0b59e9c335d9da09fe54d6		 rtf-objdata-decoded RTF \objdata at offset 0x5250 1975 bytes

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