Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8351c4db78aaa573…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a170b2cb2ca29c9b493093bc064c2d3b SHA-1: 868e60817aa315038090ea8a10672ce69f73efb0 SHA-256: 8351c4db78aaa573e2c3d5e6190f9fb3c63d7b291fbc5bf4998dad5cdda74de7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The VBA code appears to be heavily obfuscated, but the presence of these references strongly suggests an attempt to download and execute a secondary payload. The GetObject call further indicates potential for object manipulation or execution. Given these indicators, the most likely attack pattern is a macro-enabled document used for initial access via spearphishing.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
5dc6c3a212a4c7061ac8309f7f410c84082198d241f7676d9a3201118ffe1940		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
4fee54e33fcbe2ea822ea7ca1b9fce0a82f488b98aeede62e226ba83d208cd96		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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