Malicious RTF — malware analysis report

Static analysis result for SHA-256 f0b69d5449fca18f…

MALICIOUS

RTF

55.8 KB
MD5: 94fd6b71bdb46a0427c3244ea1498a15 SHA-1: a485637a05f37885814bd5fe4155dbb5fa1fc98b SHA-256: f0b69d5449fca18f0e068b28e09743a607fcfcb3f2daa62b9ee47001ec54de89
160 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that triggers a known vulnerability, CVE-2017-11882, within Microsoft Equation Editor. This exploit allows for arbitrary code execution, likely to download and run a secondary payload. The presence of the Equation Editor CLSID and the specific CVE firing strongly indicate this attack vector.

Heuristics 4

  • 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.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000109.bin
d92b0cb4b572880277f9018494884cf153f8a5eae8bc5b246efedf30c8553f52		 rtf-objdata-decoded RTF \objdata at offset 0x109 3631 bytes

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