Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e838d201eacc477c…

MALICIOUS

RTF / .DOC

1.07 MB Created: 2019-09-17 13:59:00
MD5: 2000a0317a9514123e45a7fbcadd24f1 SHA-1: 9182238a555a234c18c160b865a2d1d7130dcbe3 SHA-256: e838d201eacc477c4ef05e34bca3297cefa47ff28a430f2e9165b8369343ad81
240 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 Malicious Link/Object T1559.001 Component Object Model Hijacking T1059.001 PowerShell T1203 Exploitation for Client Execution

The file is an RTF document containing an embedded OLE object that leverages the Equation Editor. Critical heuristics indicate exploitation of CVE-2017-8759, a known vulnerability in MSXML that allows for OLE activation. The presence of \objupdate and \objdata sections further suggests an attempt to trigger code execution. The 'Password-protected archive handoff' heuristic indicates the document likely contains instructions to decrypt a payload, which is then executed.

Heuristics 7

  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0010c27d.bin
cc34c165d78dfc8832a3ee565ffa519fe09f9cee76b42112b5f94ba57b29df32		 rtf-objdata-decoded RTF \objdata at offset 0x10C27D 3739 bytes

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