Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 80afb1e06243c76a…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d71d132b24697daf744ae0c6114d6356 SHA-1: f105b9268e4834e79a70b72617862f902108b8aa SHA-256: 80afb1e06243c76abb42cab907f760efe4ba2398904a7de43a8fb4c90d2f5686
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample 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 GetObject call further supports the likelihood of object instantiation for malicious purposes. The primary function of the VBA appears to be decoding and executing further stages, likely involving PowerShell or cmd.exe to download and run a payload.

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
0233a553b2331a63ea067330e7694daea29bbcc2cbb120b1353156bcd62ac6a2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
4e304d2d09a21d81762cc5dc6d856bd17a95e31f47fdda7ca4328c21daf90f34		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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