Malicious RTF — malware analysis report

Static analysis result for SHA-256 6e0733dec91967f7…

MALICIOUS

RTF

8.3 KB First seen: 2020-08-10
MD5: 3a16afd83fbdb3796bf7d52dcc9e320f SHA-1: 49fa80342770adb59a4bba16643559472abf60b5 SHA-256: 6e0733dec91967f727b8d3442677098e9ce5fe2fbe2abe59ae4837537e11558f
160 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data and specifically triggers heuristics for Equation Editor exploitation and automatic OLE activation. This indicates the file is designed to exploit a known vulnerability in the Equation Editor component to achieve arbitrary code execution. The embedded object data is likely a malicious payload or a loader for one.

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
  • 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_off00000036.bin rtf-objdata-decoded RTF \objdata at offset 0x36 4132 bytes
SHA-256: d37c6e600cbc09219d91d9bbb19ce38b37100fd59e1799f5955554f73fc72909

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