Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1b455c971fb765b1…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4938e295917feb4a227e6bfd117f9436 SHA-1: f3827bdf7e75ca59e9302857d3efda1a50781396 SHA-256: 1b455c971fb765b1db2bc5a0a5f58538db3a9b7abc1fdb91ac449b274f9ef867
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code itself appears to be heavily obfuscated, but the presence of these references strongly suggests it's designed to download and execute a second-stage payload. The specific family is not identifiable from the provided evidence.

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
ab63fa89ac4d64e569e0c6c6f382baa268e220d77a3db17bf54f047187a4a63b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
f358fd826b45007ed77fbac6f2ec1d778e02e19eea04f8d6c2245a63f898de98		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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