Malicious RTF — malware analysis report

Static analysis result for SHA-256 5f8e283da4cbb204…

MALICIOUS

RTF

414.9 KB First seen: 2019-05-16
MD5: 90f953beee5cfb580d43706d10cbbd7e SHA-1: b7b960ff3726e5157e3a3ca5cc915197e64c2df2 SHA-256: 5f8e283da4cbb204f3c36bbb9fc77dffe61053bbb4aa52e499befcd17b764861
120 Risk Score

Malware Insights

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

The sample is an RTF document that contains an embedded OLE object, which is forced to activate via \objupdate. ClamAV detection confirms this is a known exploit for CVE-2017-11882, targeting the Equation Editor. This exploit allows for arbitrary code execution, likely to download and run a secondary payload.

Heuristics 3

  • 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_off000012ad.bin rtf-objdata-decoded RTF \objdata at offset 0x12AD 118978 bytes
SHA-256: b233286163012f150518401621d187ae11624f05805051420e637faa156e2b78

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