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

Static analysis result for SHA-256 8117e31e9105974e…

MALICIOUS

Office (OLE) / .XLSX

329.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 4cbabec8fa639314666514d0cf8948e1 SHA-1: b9a981a054801284505469e87e404ca9e7ac3573 SHA-256: 8117e31e9105974eef55b8dcb43ca471f438d0889cab14c73c38f1e4ebd42c46
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.004 Scripting: Command and Scripting Interpreter: PowerShell

The sample contains Excel 4.0 macros (OLE_XLM_AUTOOPEN, OLE_XLM_DANGEROUS_FN) that utilize the ShellExecute API (SC_STR_SHELLEXEC) to run external commands. The embedded URL points to a GIF file, which is likely a lure or a component of a downloader. The ClamAV detection (Doc.Downloader.Docusign0521-9864805-0) further supports its nature as a downloader. The macro's intent is to execute a payload from the provided URL.

Heuristics 5

  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • XLM Auto_Open with dangerous formula APIs high OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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://anhii.com/ds/161120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b74fbb14c9dd0283fe5b35630158622cf58bbddcd03d161d30bf64d1f40271a4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7889 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.