Malicious RTF — malware analysis report

Static analysis result for SHA-256 c7b4336dd86bfa54…

MALICIOUS

RTF

85.6 KB
MD5: 080e69ed2186cdfd127b33be98b5a322 SHA-1: 74289b40cd79aac19043c9d1801e01781c4174ea SHA-256: c7b4336dd86bfa54497c824d53dab494289f62cf345ff8021583a49a037b6ff6
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 object is processed. The embedded object's structure indicates a likely attempt to deliver a second-stage 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_off0000236f.bin
1fc83abc860dc1eacd00f3ba5e1ba2fc3f369b2fde1e5de00dd37ff2e1367913		 rtf-objdata-decoded RTF \objdata at offset 0x236F 3631 bytes

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