Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 306502893ad9a0ea…

MALICIOUS

RTF / .DOC

57.1 KB Created: 2022-01-10 21:17:00
MD5: d541f3b01334cd51d5e954f18f2b53a8 SHA-1: 2bffe02ead5f077da02011f85c5e7387f4d5b6ac SHA-256: 306502893ad9a0ea509f8b479472f77221630d29f5c982db2a4a538196fcc918
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The file is an RTF document containing an embedded OLE object that leverages the Equation Editor component. Critical heuristics indicate the presence of Equation Editor CLSID and object class, strongly suggesting an exploit targeting this component. The RTF_OBJDATA and RTF_OLE10NATIVE_STREAM heuristics further confirm the presence of embedded object data. While no specific malicious URL or script was directly extracted, the exploitation of the Equation Editor is a common initial access vector for delivering secondary payloads. The benign URL found is likely a red herring or part of the exploit structure.

Heuristics 6

  • 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
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • 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_off0000543d.bin
0aae1a66fb885142f0d9f9ac0ae75377e853863f3e5bab5fc7335e62b8ef5d0d		 rtf-objdata-decoded RTF \objdata at offset 0x543D 7972 bytes

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