Malicious RTF — malware analysis report

Static analysis result for SHA-256 dfc0ec410c4b4db4…

MALICIOUS

RTF

8.2 KB First seen: 2019-11-20
MD5: 3b6580fa92cd5125257d8b9ae28cd009 SHA-1: f820bd0284239553249963a22214259773a684ad SHA-256: dfc0ec410c4b4db4f0c1a9ae4c7fc21365ee476532adfe417da8409d88354bfd
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 embedded OLE object data. Heuristics indicate a critical vulnerability, CVE-2017-11882, related to the Equation Editor component. This exploit allows for arbitrary code execution, likely as part of a spearphishing attachment campaign. No specific family could be identified.

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 4142 bytes
SHA-256: 18175e0c04e1757458fb3a49250b57116f04fe549d13246f553cbeae2bdc8dda

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