Malicious RTF — malware analysis report

Static analysis result for SHA-256 344a2a19f844a03e…

MALICIOUS

RTF

83.3 KB
MD5: 7f85549df75e2161156132f831c138be SHA-1: cbac8d56689a315c234278ff638ec90f08b047f6 SHA-256: 344a2a19f844a03eff6929c51eb1f3434324d9ff97935851e197a5b630fb91f9
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 the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, likely to download and run a second-stage payload. The file is classified as malicious due to this exploit.

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_off00002370.bin
94cf61ff46aa4f756c8288986c212d4dc480ccde2f6e6b8aadd577eac8be12da		 rtf-objdata-decoded RTF \objdata at offset 0x2370 3631 bytes

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