Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d44ead46230d67d0…

MALICIOUS

RTF / .DOC

2.28 MB
MD5: 6b2201e4c76bcde63d5cc3493c929759 SHA-1: 26afb6e1ece75354bab33d0fec45fdef9183e443 SHA-256: d44ead46230d67d0d646ef14b7f78fd6512fbad00d4abb683073d245f3e1ba7b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The RTF document contains embedded OLE objects, specifically triggering the Equation Editor vulnerability (CVE-2017-11882). The presence of ".objdata" sections and the "RTF_EQUATION_EDITOR" heuristic indicate that the file is designed to exploit this known vulnerability. The OLE object activation is forced via \objupdate, leading to arbitrary code execution.

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.
  • \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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001202.bin
0b516d4a4419b6ca4e2971b8de37ee0f49f9e23189d0dd5a8f44d3f5ad4acfea		 rtf-objdata-decoded RTF \objdata at offset 0x1202 41934 bytes
objdata_01_off0002e277.bin
ab8190dca09da6ff1dca4796336845f61c912c780626e8cf56ac21aee774da20		 rtf-objdata-decoded RTF \objdata at offset 0x2E277 476431 bytes

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