Malicious RTF — malware analysis report

Static analysis result for SHA-256 1d4af2b09b637384…

MALICIOUS

RTF

11.6 KB First seen: 2019-09-30
MD5: c220f21f4a145df4700bc54a5153067d SHA-1: cf3e547a4228075dc9bc00524ace7ec2c577d00f SHA-256: 1d4af2b09b63738445f6e48d69c3f9d869a147f04cd3098fdbc0398a853df60f
220 Risk Score

Malware Insights

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

The sample is an RTF document containing an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is known to be used to download and execute arbitrary code. The ClamAV detection name directly indicates the exploitation of this CVE. The presence of OLE object data and automatic linking further supports the exploitation vector.

Heuristics 5

  • 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
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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_off00000e17.bin rtf-objdata-decoded RTF \objdata at offset 0xE17 4145 bytes
SHA-256: 3d50f8efc883d0741959b97709fb9ee66774bcd0ed6c43ed62718ceecafd684c

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