Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6882531ca612cad1…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7c56a446ba5bc8502bb45f4b1b372b90 SHA-1: 642f93984c033ca22a4f3e30669c1ec9068d7e16 SHA-256: 6882531ca612cad1c3132a337570f8176319f559c6b7ee27b09af5544ceb305c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an Excel document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it's designed to execute commands on the host system. The presence of a Base64 decoding function within the VBA code implies that malicious content is likely encoded and then executed, possibly to download and run a second-stage payload. The GetObject call further supports the possibility of object instantiation for malicious purposes.

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
bd07fd47c1eb32b34fd9a55559e019a731fcea671720395d9179a2576be9a358		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
79dad8a4405bee0010804d84743107646cd1fd7b40d885757714808d0f183400		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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