Malicious RTF — malware analysis report

Static analysis result for SHA-256 f1bd3211208e0c6c…

MALICIOUS

RTF

8.1 KB First seen: 2019-01-11
MD5: 72720e97dd0c19e1b4d442e2ad412471 SHA-1: 6b1e7aab79c33f4fad14986c5f13dd2dd3aa5c98 SHA-256: f1bd3211208e0c6ccc0511d25e58e35706d0d398e1ae89e09b441691677a20b5
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains an embedded OLE object that triggers an exploit in the Equation Editor component. This is strongly indicative of CVE-2017-11882, a known vulnerability that allows for arbitrary code execution. The ClamAV detection further confirms this specific exploit. No document body text or scripts were extracted, limiting further analysis of the 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 4135 bytes
SHA-256: 527ac25f535a000b4d0bef4900de95a5a16965252fb3130690f02dc86288b50f

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