Malicious RTF — malware analysis report

Static analysis result for SHA-256 cb989a77da915964…

MALICIOUS

RTF

53.5 KB
MD5: 4fe33b4b68572ac174e3e019ab8e8c2f SHA-1: 247e6e913661598531bdaed66989449c996c3fc1 SHA-256: cb989a77da9159641ac5d5b411815443955533eaad9e9ffd7dcb4dbf1f498455
160 Risk Score

Malware Insights

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

The RTF file contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened, likely leading to the download and execution of a secondary payload. The specific exploit details suggest a targeted attack, but no further family attribution can be made.

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_off00000108.bin
fc216513985b5c6b7665b85d945974f799e9d0d5aef3abdbe05dae9f782d2ae3		 rtf-objdata-decoded RTF \objdata at offset 0x108 3631 bytes

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