Malicious RTF — malware analysis report

Static analysis result for SHA-256 129e129968cfe3c3…

MALICIOUS

RTF

8.2 KB First seen: 2019-02-20
MD5: 890efa0076ecff9f5cc118ced0e9f278 SHA-1: 2dccfbef0818e97d75e3cd585f5acf8bb4b1f24b SHA-256: 129e129968cfe3c38ab3262b0be40311738124e18dad71f1eb21d3d139e36ac9
240 Risk Score

Malware Insights

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

The sample is an RTF document that contains an embedded OLE object. Heuristics indicate a critical vulnerability in Microsoft Equation Editor (CVE-2017-11882) is being exploited. This vulnerability allows for arbitrary code execution when the document is opened, likely leading to the download and execution of a secondary payload. The file's SHA256 hash is provided as an IOC.

Heuristics 5

  • 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.
  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • \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_off0000003c.bin rtf-objdata-decoded RTF \objdata at offset 0x3C 4156 bytes
SHA-256: 2b1c196817a9448abb025e4b08b93890222663a02553fece223fa62f53b94a82

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