Malicious RTF — malware analysis report

Static analysis result for SHA-256 07e9d6137cab09ff…

MALICIOUS

RTF

8.2 KB First seen: 2018-11-13
MD5: 4dae6813c2cad26d62fcaea8d9546a2d SHA-1: 7e6dd06aea79614d489f4f33aa69db7d290babce SHA-256: 07e9d6137cab09ffdc72d5938fde189f82a77fa59ad82609b92fb5f8300909ba
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document that contains an embedded OLE object, specifically triggering heuristics related to Equation Editor and OLE activation. ClamAV detection confirms this is a known exploit for CVE-2017-11882, which allows for arbitrary code execution. The embedded object data is likely the exploit payload.

Heuristics 4

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • \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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 4159 bytes
SHA-256: 9af556f7085e751e3f4fde4f584cd259220c64debe9059b49d2886b0922d43e4

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