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

Static analysis result for SHA-256 f66f9f0e293e622b…

MALICIOUS

Office (OLE) / .XLSX

64.5 KB Created: 2021-08-17 12:24:08 Authoring application: Microsoft Excel
MD5: 847450c0ed9954c2e9bdc5cd457d444c SHA-1: cef226d614868e6a2fd9528d29a010a551fe5061 SHA-256: f66f9f0e293e622b046ab473cf99d071a377418fd69bf1685c8d23c371f517cc
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment

The file is an Excel spreadsheet containing a VBA macro that is automatically executed upon opening (Auto_Open). This macro utilizes a ScriptControl object to execute code embedded within the document's 'Subject' and 'Comments' properties. The ClamAV detection name 'Xls.Downloader.MirrorBlast-f8f807074fc98734-9955046-0' strongly suggests that this macro is designed to download and execute a second-stage payload. The specific content of the embedded script is too generic to determine the exact payload, but the overall mechanism points to a downloader.

Heuristics 3

  • ClamAV: Xls.Downloader.MirrorBlast-f8f807074fc98734-9955046-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.MirrorBlast-f8f807074fc98734-9955046-0
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
0278d22c57457c6ea65486c5e13f4b06bae683e9ef9fa360c905d1932da96848		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 862 bytes

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