Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 169b657564b60d5e…

MALICIOUS

RTF / .DOC

14.7 KB First seen: 2022-10-25
MD5: ae2d2b9629a5a30a242a722ac6792be4 SHA-1: 36e399567271bc76a8c055922e9eb95634f19d4f SHA-256: 169b657564b60d5e84efb2848265dfc9d0d615065280000c14a78720cf2e6c6f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

The RTF document contains OLE object data and is specifically flagged for exploiting CVE-2017-11882 through the Equation Editor. The presence of \objdata and \objupdate directives further indicates an attempt to automatically activate and execute embedded OLE objects. This exploit is commonly used to deliver a second-stage payload.

Heuristics 5

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001e69.bin
0e31b59f59f88ca096ab1a0a6b21b853440fe71df6f35aafdeb77802049746ea		 rtf-objdata-decoded RTF \objdata at offset 0x1E69 1958 bytes

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