Malicious RTF — malware analysis report

Static analysis result for SHA-256 5fc9ba575cec9fcc…

MALICIOUS

RTF

8.2 KB First seen: 2019-08-04
MD5: 2531534f0fe411079a5f2e05416bdd87 SHA-1: 1512157bdf15329c4c60200d27a5506e54a03c5a SHA-256: 5fc9ba575cec9fcc89b2b734e3fad355817d387f56de0bc3920c44db526bccd1
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and specifically triggers 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 a shellcode payload designed to exploit this vulnerability.

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_off0000003b.bin rtf-objdata-decoded RTF \objdata at offset 0x3B 4143 bytes
SHA-256: 3cc967761c33d573f77d83772e5fd0a1f7ba16c88541127e96a3dae9d3770ea6

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