Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0b3629063427a85e…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: bfac7063fb6d20be82f59c34bfdb7349 SHA-1: f3222933115853e117451ae871f813e29a4c72b1 SHA-256: 0b3629063427a85ea8a8610355750d982ed349c472267ceff007aeda7b69b634
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell 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, suggesting it attempts to execute external commands. The presence of a Decode64 function and the obfuscated nature of the VBA code imply it's designed to download and run a secondary payload. The specific obfuscation and lack of clear indicators prevent definitive family attribution.

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
18ffb19bcd7db92f4b2799f1a65d5f3672b1278ae2ce3fb42b994d077ecfcc6d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
e5a32c5d2cfa41843fc24c8c349a9f24ca406cc2881b68c728b270388a30eb77		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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