Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 6c02c560d60bdf9a…

MALICIOUS

RTF / .DOC

18.6 KB
MD5: e60e9170a8d3e6bc16d61742961b5712 SHA-1: 6c9a00ba219b7d1acb836cf811a54c40bfd6aff1 SHA-256: 6c02c560d60bdf9a77f56df5a389266f07428c1daf9570da0b234b54f7650506
180 Risk Score

Malware Insights

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

The file is an RTF document containing an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the object is activated, likely leading to the download and execution of a secondary payload. The document body is heavily obfuscated and does not provide direct clues to the ultimate goal.

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_off0000199a.bin
87c3c64b3d57ddbad520d6c80c20f511228fd5183f2e90669c5052263f389edb		 rtf-objdata-decoded RTF \objdata at offset 0x199A 1446 bytes

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