Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 324c53408c73a8ef…

MALICIOUS

RTF / .DOC

51.5 KB First seen: 2023-01-13
MD5: 52c1cb964321f2b61e491c690ef90b5b SHA-1: 3501a75ccb16262922d50800157458c2206df17c SHA-256: 324c53408c73a8ef5ce7ec5fc0dfb14810d1e5ab7485d9a1edfd7ddec636b34d
220 Risk Score

Malware Insights

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

The sample is an RTF document containing an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The document body includes a lure to 'Enable editing', a common tactic to bypass security measures. The embedded object is specifically flagged as related to CVE-2017-11882 activation, indicating the exploit is present and likely intended to download and execute 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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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
  • 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_off00004b1c.bin
6f38d7abb7666917edc716766f49e5841775307283d6bad5558ef21864f55e04		 rtf-objdata-decoded RTF \objdata at offset 0x4B1C 1790 bytes

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