Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 79c0ec73753eaf5f…

MALICIOUS

Office (OLE) / .XLSX

973.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: bab0159cad38d589789b94ced5e7439a SHA-1: 34e7944d8c1d559bbae01135adb7c0ab16832465 SHA-256: 79c0ec73753eaf5fff4d06717696ff80597b34462c77c425867bdb70ca4c544e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file exploits CVE-2017-0199, a known vulnerability for remote code execution, to download a payload from a provided URL. The VBA macros are present but appear to contain no executable statements, suggesting the exploit is leveraged directly. The ClamAV detection as 'Xls.Downloader.Trojan' further supports its malicious nature as a downloader.

Heuristics 4

  • OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199
    Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
  • ClamAV: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • 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://linkjago.me/fhq3w8?&pupil=gigantic&antechamber=substantial&rub=quick&sideboard=divergent&petticoat

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
382fc1344a2f0cf6eda18645d41def8d571debc6637bc7fe02a5c83715a51bef		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2112 bytes

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