Malicious RTF — malware analysis report

Static analysis result for SHA-256 93f5aa63f1279c15…

MALICIOUS

RTF

9.2 KB First seen: 2019-05-16
MD5: fdaa8af44aa6bc78a2266e3ccdbd6fc6 SHA-1: ac7c0657fded9039d4a76e942e0690b96e55e1d7 SHA-256: 93f5aa63f1279c155b605aa714bf311ea03143521215a3546742c05725c086df
180 Risk Score

Malware Insights

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

The sample is an RTF document containing an embedded OLE object that exploits CVE-2017-11882 via Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, indicating a malicious intent to compromise the user's system. The presence of the exploit suggests it was likely delivered as a spearphishing attachment.

Heuristics 4

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000033.bin rtf-objdata-decoded RTF \objdata at offset 0x33 4669 bytes
SHA-256: 5aedc0c4b6e4376d15accad2b684a70f96a8e344d06b1c3687003b7566e5cfea

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