Malicious RTF — malware analysis report

Static analysis result for SHA-256 453f9ddf681939e4…

MALICIOUS

RTF

47.0 KB First seen: 2023-02-21
MD5: 9ccde48d9e4af73012f22a8741a274d6 SHA-1: 25d5f3bd79abe51fd6575a3df8d1833173a59ac2 SHA-256: 453f9ddf681939e4e0427dbfcf710385d860d03c7cedec09db53569161e73a33
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.005 Visual Basic

The RTF file contains an embedded OLE object specifically identified as related to CVE-2017-11882, exploiting the Equation Editor vulnerability. The document also contains a lure instructing the user to 'Enable editing', a common tactic to bypass security measures and facilitate the execution of the embedded malicious object.

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_off00005a6b.bin
27a546113f03a99e8cc8ff564f9fb5f067cc95fce703d4c9467d7cf637d3b6f3		 rtf-objdata-decoded RTF \objdata at offset 0x5A6B 1825 bytes

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