Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0fd3792d65a1273a…

MALICIOUS

RTF / .DOC

2.09 MB
MD5: 1699f84abeb3cddd9ca8972f0c9b7c64 SHA-1: 85a6a388e76479222510f65d3757ce4175a02dde SHA-256: 0fd3792d65a1273ae979d34d19cbafe3059710e3a54e1848a71a8692145283e5
180 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability through the Equation Editor. This exploit is designed to execute arbitrary code, likely leading to the download and execution of a secondary payload. The presence of RTF_OBJDATA, RTF_OBJEMB, RTF_EQUATION_EDITOR, and RTF_OBJUPDATE heuristics strongly indicates this exploit vector.

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_off00001202.bin
5a179a854f8f52a5d72d6a4be4239ce0a5de3633ff94f0ce892b3bf4806259b4		 rtf-objdata-decoded RTF \objdata at offset 0x1202 27251 bytes
objdata_01_off0001cef3.bin
53b9f303d393dc929d79a2b5c8f4ddab6c91c8bfe1e80e0ffc1a4d210ef1046d		 rtf-objdata-decoded RTF \objdata at offset 0x1CEF3 362344 bytes

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