Malicious RTF — malware analysis report

Static analysis result for SHA-256 16a74b44f1d4ca3b…

MALICIOUS

RTF

156.0 KB
MD5: e10570f8f16ed753ff4a8afb83cc9d3c SHA-1: c2b96f37636202d34584f0b2dedd4e11cc9d3ef6 SHA-256: 16a74b44f1d4ca3b850910182d2e87b2317f7aa9becb15d330416eee1fb55e07
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, likely to download and run a secondary payload. The presence of ".objupdate" further indicates an attempt to trigger OLE object activation.

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
  • \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_off000000aa.bin
8ce00395f689dff63f4fa6ea32de62631edb3749d66cd61163efa425cc1ca597		 rtf-objdata-decoded RTF \objdata at offset 0xAA 53724 bytes

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