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

Static analysis result for SHA-256 d0638094c4a5fa0f…

MALICIOUS

Office (OLE) / .XLSX

444.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2024-07-01
MD5: 7e1b4052d2483eea21ef214b8cb1337f SHA-1: a9782bfd20d66004d268e0570384d40b55ba0974 SHA-256: d0638094c4a5fa0f87c6e1441f8ea916027d4b772df322143f9254dc74781fd6
130 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic

The critical heuristic firing for CVE_2017_0199 indicates the file is designed to exploit this vulnerability, likely to download and execute a secondary payload from the provided URL. The presence of VBA macros, though not directly executable in this sample, further supports a malicious intent. The ClamAV detection confirms its classification as malware, specifically 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 http://woiwoiwoiwoi@woi.gg/1v6uTh

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes

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