Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e56d5245d4682ff1…

MALICIOUS

RTF / .DOC

37.2 KB
MD5: d0d3448509bcdaa023c02601aba4f819 SHA-1: 6f1eb94c006ef9528049c959139624744fb54018 SHA-256: e56d5245d4682ff1e538c34facac650d5da7d7b9f521ae641487590aefba3356
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains embedded OLE objects, specifically triggering heuristics related to Equation Editor. The critical firing 'RTF_EQUATION_EDITOR' and high firing 'CVE_2017_11882_ACTIVATION_RELATED' strongly indicate the exploitation of the CVE-2017-11882 vulnerability. This vulnerability allows for arbitrary code execution when the embedded Equation Editor 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_off00001e49.bin
555b3755cc36357e5a1c9c91f057cd47c148c782481e3852564a64cca1863189		 rtf-objdata-decoded RTF \objdata at offset 0x1E49 1737 bytes

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