Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a792c0fa1891acbd…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 74c8e9d7a48fe49cb13acf3eeed29782 SHA-1: 27b1822239611bbec74facb6990f2b51c28d61c2 SHA-256: a792c0fa1891acbd430684201b5f45beb44ee976e79fdb0e4041d896cbe5c5aa
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating that a payload is likely being obfuscated and then executed. This points to a macro-based downloader.

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
5bffc565aaff02b4b38ac37a9b956ed93cc516b8b0fc83f05888e5ca72e9b3a8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
f10dca26fe0979708edbdffcbd76bd6fa7a3d6e72a5544394c48382d66a4c77a		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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