Malicious RTF — malware analysis report

Static analysis result for SHA-256 67c9802320b52a89…

MALICIOUS

RTF

20.5 KB
MD5: 607cad41ff84f3dcd94678b952fa6a6f SHA-1: b04587bd479c6d37a68104b29b8f5fd1d4e091f7 SHA-256: 67c9802320b52a89f99ac0fa069dd2e7c8ff5a3a590cd7f6767587ce9f0af1ee
180 Risk Score

Malware Insights

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

The RTF document contains embedded OLE object data, specifically targeting the Equation Editor component. Heuristics indicate a critical firing for RTF_EQUATION_EDITOR and high firings for CVE_2017_11882_ACTIVATION_RELATED and RTF_OBJUPDATE, strongly suggesting exploitation of the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the embedded object is activated, likely leading to the download and execution of a secondary payload.

Heuristics 5

  • Obfuscated Equation Editor ProgID + activation critical CVE related RTF_EQUATION_EDITOR
    RTF decodes to an Equation.3 ProgID from top-level \objdata hex after nested RTF junk groups are ignored, and the document also contains \objemb plus \objupdate activation. This is an obfuscated Equation Editor exploit surface associated with CVE-2017-11882 / CVE-2018-0802 families, but no exact malformed MTEF CVE primitive was recovered from this object.
  • 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.
  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000168a.bin
29411d98c637a7d29c5e923442156d099612bc2254a8f3276b4585b4536a9621		 rtf-objdata-decoded RTF \objdata at offset 0x168A 1644 bytes

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