Malicious RTF — malware analysis report

Static analysis result for SHA-256 bd058038d7f5a963…

MALICIOUS

RTF

52.9 KB
MD5: 62712fba57797511a3b41ee859e5b512 SHA-1: 83165b59ec7a9cc8b70a3bd5e09ee5cb36e4eb48 SHA-256: bd058038d7f5a963ebf43f80fb38391af9054418f6ce0294021354abe4db50b4
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 leverages a known vulnerability in Microsoft Equation Editor (CVE-2017-11882). This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload. The presence of OLE object data and the specific Equation Editor CLSID 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_off00000112.bin
51e5eeeeb4c32e31debaae9e5c4bc36db202706bcace8a2a1aeaddfd84ef0916		 rtf-objdata-decoded RTF \objdata at offset 0x112 3631 bytes

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