Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 d7993d70d7f8a1d6…

MALICIOUS

RTF / .DOC

2.21 MB
MD5: 6ec0bc735c8265f7708b78c13255d816 SHA-1: e5b9838854f6dbf46a779097084520685941a942 SHA-256: d7993d70d7f8a1d66a2a20842331dbe29e0ad8af5fad8a086892fe89878fdfa5
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document that contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability related to Equation Editor. This exploit allows for arbitrary code execution, likely to download and run a secondary payload. The presence of `Equation.3` as a ProgID strongly indicates the use of this known vulnerability.

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
b5d18e02aa2ba4a47648552df2446c303c2387689f3e676d4e9a086cee5f9778		 rtf-objdata-decoded RTF \objdata at offset 0x1116 26826 bytes
objdata_01_off0001c669.bin
fe43efbadd674765243cb2580d9955cd54bcbea3b2eb0d6d648fe532cb7ef883		 rtf-objdata-decoded RTF \objdata at offset 0x1C669 476202 bytes

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