Malicious RTF — malware analysis report

Static analysis result for SHA-256 61115d27cb35e6bf…

MALICIOUS

RTF

370.8 KB First seen: 2020-05-25
MD5: 4335421ed6bd4826fd78766b7bf8f223 SHA-1: 707c2feea1fc4a91c168031400b1e6fa706db66b SHA-256: 61115d27cb35e6bf9835761e1897e53182e62ecaa63c1f3533bbf24cc940e805
160 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability allows for arbitrary code execution when the object is activated, likely through the ".objupdate" directive. The file is classified as malicious, indicating it's intended to deliver a 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
  • 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_off000000a9.bin rtf-objdata-decoded RTF \objdata at offset 0xA9 115960 bytes
SHA-256: 019ec04bb4dc2a58ce7697791838e0ae280e677b7086c00028d5253cf8d552d4

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