Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d95fbaa4ed835057…

MALICIOUS

RTF / .DOC

12.9 KB
MD5: 1aa236116a153753d97549e50e0e3eb4 SHA-1: f91ada10ffb9b8a4ddc496b93428c38a668fcc8b SHA-256: d95fbaa4ed83505726f05c48e7c5fb02d875fc6ac5971ce3fbfa8f2fe4b9f70a
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

The RTF document contains embedded OLE objects, specifically triggering the Equation Editor vulnerability (CVE-2017-11882). The heuristics indicate that the object data is obfuscated and the Equation Editor is activated, which is a known method for arbitrary code execution. This exploit allows for the execution of malicious code, likely leading to further stages of an attack.

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_off00001a72.bin
97814156a0b5afa80191c42c783efa4045ff52e8a7f23da8e3031894dc41dce8		 rtf-objdata-decoded RTF \objdata at offset 0x1A72 2022 bytes

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