Malicious RTF — malware analysis report

Static analysis result for SHA-256 5ce55efd4d293d47…

MALICIOUS

RTF

16.0 KB
MD5: a0d5b37e4a95ecb1da36bc137e312663 SHA-1: 469db4eb7fd79b7a4df1eafba50959dcf49a5e80 SHA-256: 5ce55efd4d293d47b31a089f008c967f26e5d80338efd5b3d75e6900e3f57752
140 Risk Score

Malware Insights

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

The RTF document contains embedded OLE object data that triggers a known vulnerability in Microsoft Equation Editor (CVE-2017-11882). This vulnerability allows for arbitrary code execution, which is likely used to download and execute a secondary payload. The presence of the ".objupdate" directive further indicates that the embedded object is intended to be activated automatically. No specific family could be identified, but the exploit vector is clear.

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.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • 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_off00000f5d.bin
f28b9552cb30644bb22373260dfbbdff4838f1aaf480aa77230443eca9ff7411		 rtf-objdata-decoded RTF \objdata at offset 0xF5D 4149 bytes

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