Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 1e9510cbf17c43c9…

MALICIOUS

RTF / .DOC

4.0 KB First seen: 2022-12-05
MD5: f0b8d7411806a64ce27ab114f9227dc6 SHA-1: 6b3907622e38bd970ee163749a15231a7ba40f28 SHA-256: 1e9510cbf17c43c9c02aa4e61cebef5c5659e6eebfc860e0f09719dc1f3483e7
200 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains an OLE object with an obfuscated Equation Editor ProgID, triggering the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the object is activated, likely leading to the download and execution of a second-stage payload. The specific ProgID 'equATiOn.3' is a strong indicator of this exploit.

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.
  • 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_off0000007e.bin
da02da2b1da630d42f3f5dfdee33f5599cabe5ee4ca1956fa7ca8572263948b7		 rtf-objdata-decoded RTF \objdata at offset 0x7E 1927 bytes

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