Malicious RTF — malware analysis report

Static analysis result for SHA-256 136411dc12b5a387…

MALICIOUS

RTF

24.9 KB
MD5: 37283c12d1170ce2de9ac3a6bb6588b5 SHA-1: 357159a1dd02d718183c5fbb071dc18070255772 SHA-256: 136411dc12b5a387c948358b76a699a96304fa34c21e80cdfa7079df371a9130
260 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that leverages the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is known to be used to execute arbitrary code, likely to download and run a second-stage payload. The presence of the Equation Editor CLSID and the Ole10Native stream strongly indicate this exploit.

Heuristics 6

  • 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.
  • 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
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001736.bin
2ccc8c48af651f8ed75076ec7f1f3eb5685ad8065d767b1d0c521413be832d1f		 rtf-objdata-decoded RTF \objdata at offset 0x1736 4202 bytes

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