Malicious RTF — malware analysis report

Static analysis result for SHA-256 16b4105d9a4d2864…

MALICIOUS

RTF

133.5 KB First seen: 2020-05-14
MD5: 16301616cc5ebdb980a18fb0663dfd7e SHA-1: 2aa871d3a01afe427a73792f18b041cbb7a32ec6 SHA-256: 16b4105d9a4d2864b1ba028920deacdcd116a2c68572d331139b9cf0652d896a
180 Risk Score

Heuristics 5

  • Equation Editor Ole10Native payload — CVE-2017-11882 likely critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    RTF decodes to an activated Microsoft Equation 3.0 OLE storage whose payload is a high-entropy Ole10Native stream rather than normal Equation Native/MTEF data. This is a weaponized Equation Editor RCE delivery shape consistent with CVE-2017-11882/CVE-2018-0802.
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • \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_off000015e4.bin rtf-objdata-decoded RTF \objdata at offset 0x15E4 43626 bytes
SHA-256: 4cfca9e0c9deb17ab6848b5a390eecaf510a46f6b7fc5917e2d4607760fb1140

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