Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 032d8c993d7dffbb…

MALICIOUS

RTF / .DOC

8.8 KB First seen: 2022-06-08
MD5: f8dd6cbc17573f7bd0e0beb981522c86 SHA-1: 9eae27f905c0b07f3dc4da61a8bb94257d840ad7 SHA-256: 032d8c993d7dffbb2d0c52d13afd4aa7d17a324c241c7f8cd453307ef66ab818
200 Risk Score

Malware Insights

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

The RTF document contains multiple indicators of exploiting the Equation Editor vulnerability (CVE-2017-11882), including specific ProgIDs and activation-related heuristics. This exploit is designed to execute arbitrary code, likely to download and run a secondary payload. The presence of OLE object data and auto-linking further supports the exploitation vector.

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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000e14.bin
923c53c51a197973a827a8ca154d24834b7c0db0d8bd97f5e86a2023f169326a		 rtf-objdata-decoded RTF \objdata at offset 0xE14 1649 bytes

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