Malicious RTF — malware analysis report

Static analysis result for SHA-256 c87b713f8416ba47…

MALICIOUS

RTF

8.2 KB First seen: 2019-11-20
MD5: 9d8143947667fe8eea596c1d85587f80 SHA-1: 29fcd4e77b0478f6ebd192f88bde4dd90fdc1b82 SHA-256: c87b713f8416ba47ab9c02d5d2fe51eb3d1ee1c7c663db0f159512612a20a8d3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF file contains embedded OLE object data and is specifically flagged for exploiting Microsoft Equation Editor. ClamAV detection confirms this, identifying it as Doc.Exploit.CVE_2017_11882-6934206-0, a known vulnerability. This indicates the file is designed to execute arbitrary code upon opening, likely to download and run a secondary payload.

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_off0000003f.bin rtf-objdata-decoded RTF \objdata at offset 0x3F 4142 bytes
SHA-256: 328f0b13cfa28f332e40c5ffd28e89d0b38e83aba839f7f880ce47fd558069bb

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