Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 67a92c3131a6c218…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0c96a73569478ca68847ffe3ecb1eb71 SHA-1: 6fea048eb080b7a287a95ae75d650439b9d281d2 SHA-256: 67a92c3131a6c218ed2e9a12da63c48d9b22ea21f534d5fa0609bf123ce5f46c
160 Risk Score

Malware Insights

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

The sample is an Excel document containing VBA macros. Heuristics indicate the presence of VBA macros, a reference to PowerShell, and calls to GetObject and cmd.exe. The VBA code appears to be obfuscated and includes a Base64 decoding function, suggesting it is preparing to execute a downloaded payload. The primary intent is to download and execute 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
f9d582f8da518e8e1120601513b0e15a0ee0d7882ae4d41d7a9ae9ec91d58a9d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
efed0d7da97609053e7bf9e98779cd44e888bfef1cbad4ea44310c1b82db70fd		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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