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

Static analysis result for SHA-256 c7f619995bc97f5c…

MALICIOUS

Office (OLE) / .XLS

118.5 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel
MD5: 9a5a1a96ece8355f2058a27b2ba2770e SHA-1: e12d878494854545cb39c316cc98db3c9577bf25 SHA-256: c7f619995bc97f5c8b8b24e9d55cf36d2eb0af87ba5eb389cb36ec7b0c669b76
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro is designed to execute upon opening the spreadsheet. It reconstructs a command line that downloads an executable file from 'http://18.159.149.5/nbl/joy/1-1/Sample_10120351200_ISO_035117img.exe' to 'C:\Users\Public\Documents\familylight.exe' and then executes it. The macro also writes this command to a temporary file 'C:\Users\Public\Documents\maybecall.cmd' before opening it with 'GetObject("new:shell.application").Open'.

Heuristics 4

  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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
325d6ac2f7219fde9f84699fabfe5a41eed5d03b02294d715d477b12d628983f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1319 bytes

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