Malicious RTF — malware analysis report

Static analysis result for SHA-256 236e4f90a07f9895…

MALICIOUS

RTF

55.5 KB
MD5: fd3570f9544324cf05c0fd62677b7012 SHA-1: 09846db1aa90ec3afe1129bd7e4d6dd7086b76a4 SHA-256: 236e4f90a07f98952841fc876d4c2f6f1187d4a0b740e2e7c3b388bfbb055ca7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document containing an embedded OLE object. Static analysis identified critical heuristics indicating the presence of the CVE-2017-11882 vulnerability, which is a known exploit targeting Microsoft Equation Editor. This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload.

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_off0000010a.bin
b9f141dfd3b5f6030fd909d9051976465e3d1abfea3a6762a411350d4ca3a521		 rtf-objdata-decoded RTF \objdata at offset 0x10A 3631 bytes

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