Malicious RTF — malware analysis report

Static analysis result for SHA-256 0d9aceabc6faf0d0…

MALICIOUS

RTF

194.4 KB First seen: 2020-04-06
MD5: dfd11f7d3ca0db37c5439b4fbf580f43 SHA-1: fce72568421f8fb0761540bade1278093ee8d43e SHA-256: 0d9aceabc6faf0d08ed78affbe1a1f7112fdc3cd0ce7306b4a08bbddc48e25b5
120 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 related to Equation Editor vulnerabilities and OLE object activation. This indicates the file is designed to exploit a known vulnerability in the Equation Editor component to achieve code execution upon opening. No specific family could be identified, and no further IOCs were extracted.

Heuristics 3

  • 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
  • \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_off00000076.bin rtf-objdata-decoded RTF \objdata at offset 0x76 63972 bytes
SHA-256: e83d3ab83b5a64c182cf0c0d889705a560cbed58cd1705536378603b562f72f8

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