Malicious RTF — malware analysis report

Static analysis result for SHA-256 f855faf023cc753f…

MALICIOUS

RTF

80.2 KB
MD5: eadad59f69a7b2fdd45b8d461c90cd91 SHA-1: b986ec96ae5d22c61eef1ea34d33836033192999 SHA-256: f855faf023cc753f53e3057d78218f85ee8d23caaba72eccd4837392c3b11d27
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 triggers 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_off00002369.bin
1b56fe8b76cdc542a664f385014fda5ddac893093ef6b351ed648414ded7863d		 rtf-objdata-decoded RTF \objdata at offset 0x2369 3631 bytes

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