Malicious RTF — malware analysis report

Static analysis result for SHA-256 ad1947012b951209…

MALICIOUS

RTF

7.2 KB
MD5: bf26f296fe83ca4e8db53c72ae09cf00 SHA-1: 9c0028f5fb95c022c7ae3bb3e6d646c93cbf45ac SHA-256: ad1947012b95120937a4a6c7957549fccfecc19ddbf8c5cdc944355cd87ebb29
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 exploits the CVE-2017-11882 vulnerability in Microsoft Equation Editor. This vulnerability 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 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_off00000030.bin
97b01d3218ca5b8ea6d2a349451c99f69ff093194eed24a65f7a8f15bfd83d92		 rtf-objdata-decoded RTF \objdata at offset 0x30 3628 bytes

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