Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 cb13cf57c2d7b6f0…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5df3c22773e0040e863577a24dc52744 SHA-1: 3ddb5a8e67613255e32745a997c2ec1d6c2ccf2d SHA-256: cb13cf57c2d7b6f0a48a4b6269310ac311f9a01d1bc3469776c82fe6c11b42c8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML file contains VBA macros that reference cmd.exe and PowerShell, indicating an attempt to execute commands or scripts. The GetObject call and the presence of VBA macros suggest a malicious document designed to download and execute a secondary payload. The specific obfuscation and lack of clear URLs 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
988fd72fdeedc1ed5ed75ddcc4ee9e826e9b0a39f7407f95c0516ccc25153f3d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
2f3cdbdf353f524dc97e413974a51cda888ea9fe6467b50b8419fb3d0e14f7c9		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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