Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d6c32f06acf267f9…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 60b193b9869e3ed7614da75c01e9ee28 SHA-1: 5fa5c42b4b5797c573691e759c4a3632fd78ca7a SHA-256: d6c32f06acf267f97fd170c0cae1d1075d80620726c25a8b6fd2fbbc34c82be1
160 Risk Score

Malware Insights

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

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references cmd.exe and PowerShell, suggesting it's designed to execute commands on the host system. The GetObject call and the presence of a Base64 decoding function further support the hypothesis that the macro is intended to download and execute a secondary payload.

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
6f7480cb998c7e32218ca55bf3cea50304606b12625d5df15bd4937995cf5d05		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
4d5443271620ab0e2b01902bf1ff0ffa67ca7dd5997b5ee624fdd35f18d7d9ef		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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