Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c9ba493393c1f4c9…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: b088fb53dd317b2577f9f4f54823c729 SHA-1: 5ba2ec193701b88814f9ab2441ad142ffc82fa74 SHA-256: c9ba493393c1f4c91780fc15640006f24ea6b499bd9d22a8da676a9493714053
160 Risk Score

Malware Insights

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

The Excel file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest that the VBA code is designed to deobfuscate and execute a malicious payload. The primary function of the VBA script appears to be downloading and executing a second-stage payload via PowerShell.

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
de80916a9cd9dc39709a83b1929ed3514229d20469d81b27179abea94d1ea16c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
92d6d8ba508282f1700cd0c21f046c01f3a4106d606af254c9038451f1ed7edc		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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