Malicious RTF — malware analysis report

Static analysis result for SHA-256 9c087c8eba350dd3…

MALICIOUS

RTF

768.5 KB Created: 2018-10-05 17:45:00 Authoring application: Riched20 6.3.9600 First seen: 2024-10-27
MD5: 90df8ec8e5233d34bcb54fcb75a3de53 SHA-1: 50c3e9f5d4097160aeabb7f853a667ee5eb4d468 SHA-256: 9c087c8eba350dd368e6e87d211758f2744d58e41b69b5b7128f1b81a0543239
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The RTF document contains an embedded OLE object that exploits CVE-2017-11882, a known vulnerability in Microsoft Equation Editor. This exploit allows for arbitrary code execution when the object is activated, likely leading to the download and execution of a secondary payload from the unknown URL. The document body consists primarily of font names, providing no user-facing lure.

Heuristics 6

  • 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.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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
  • 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 https://ipgrabber.ru/penis.gif
    • http://schemas.microsoft.com/office/word/2003/wordml

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00082791.bin
4ff8f0af14ddaac831738fa02ae5c98c8d23a7c2a05a027f256507ef484630e7		 rtf-objdata-decoded RTF \objdata at offset 0x82791 3546 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.