Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 534971b14abc0d7b…

MALICIOUS

RTF / .DOC

2.28 MB
MD5: 5cd86913d2c514fac26439557709aa96 SHA-1: 65f00339afb84c6c9e83c8a2fd4aa367d897102b SHA-256: 534971b14abc0d7b16338f7a1c329d044d8d9352638b9f3bb5866d5dcd1799fa
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an RTF document containing an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution upon activation. The RTF document structure and specific heuristic firings strongly indicate this exploit method. No scripts were extracted, but the exploit itself is sufficient to achieve 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_off00001116.bin
c00b3132d7c16a778fa221de1cf24e4a71fe1c695384cf6691a9d2676f1f4a05		 rtf-objdata-decoded RTF \objdata at offset 0x1116 40988 bytes
objdata_01_off0002da27.bin
fe43efbadd674765243cb2580d9955cd54bcbea3b2eb0d6d648fe532cb7ef883		 rtf-objdata-decoded RTF \objdata at offset 0x2DA27 476202 bytes

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