Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e4ccaea76e5ac295…

MALICIOUS

RTF / .DOC

422.0 KB
MD5: cc0d3c92eb3d4d58a556b09346711611 SHA-1: cb5070558c609e120bba4fd2998eba4b136298a2 SHA-256: e4ccaea76e5ac295cea93f22ce1e4d6bec012dfdbec968dda4978fec3a147062
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF document contains embedded OLE objects, specifically triggering a critical heuristic for Equation Editor exploitation. The presence of RTF_EQUATION_EDITOR and CVE_2017_11882_ACTIVATION_RELATED firings strongly indicates the use 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_off0000023d.bin
6e5608ae06c7203a463a9a415cb905ea3cbbae123923ee5e7658b6eaa3960ac4		 rtf-objdata-decoded RTF \objdata at offset 0x23D 1819 bytes

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