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

Static analysis result for SHA-256 d3bf5ac8786b4ae8…

MALICIOUS

Office (OLE) / .XLS

63.5 KB Created: 2022-11-10 07:57:43 Authoring application: Microsoft Excel First seen: 2022-11-10
MD5: a7c46f5427a76c8e4338ea9fdf0056c8 SHA-1: 433bb9bcc4a56c305c196cebc4d370ebc6b97add SHA-256: d3bf5ac8786b4ae8e33c646098065b1fbbd68b3f3b4a8eb2c649cd33d43a0bba
188 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample contains VBA macros that utilize the Shell() function to execute commands. The script decodes a base64 string to construct a URL, 'https://1y2ou4bi60ci.com/c12o-m', which is then used to download a second-stage payload. This payload is saved as 'C:\cal.exe' and executed via 'rundll32.exe'. The ClamAV detection name 'Xls.Downloader.b83ac4c497e169b5-9980307-0' further supports its role as a downloader.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Downloader.b83ac4c497e169b5-9980307-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.b83ac4c497e169b5-9980307-0
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
027e1662a91ca9e45724cd5eba018a07f94311c2655f7f5e5f4fe6e85aa3f3e8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3119 bytes

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