Malicious RTF — malware analysis report

Static analysis result for SHA-256 4b56cc337d5be2d1…

MALICIOUS

RTF

8.3 KB First seen: 2019-05-16
MD5: 22c911db0b79829103ae8e80063ac706 SHA-1: 80cc4c7a6654447b5ef471a110f5033a8f374fe1 SHA-256: 4b56cc337d5be2d19b9ef0e73a0640cdc5f9ad6f5cf6f9f1d84c6dfaca528f12
180 Risk Score

Malware Insights

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

The RTF file contains embedded OLE object data, specifically triggering critical heuristics for CVE-2017-11882 related to the Equation Editor. This indicates the file is designed to exploit this vulnerability for client-side code execution. The presence of ".objupdate" further suggests an attempt to activate the embedded object. Given the nature of the exploit, it is highly likely to have been delivered as a spearphishing attachment.

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
  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • \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_off00000032.bin rtf-objdata-decoded RTF \objdata at offset 0x32 4130 bytes
SHA-256: f8e1e60dad6479b0fdfcbc3f07c3587224e752ae0821126178bdaf0d20f2c687

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