Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 072e8b107c13b790…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 26799ecd4b7b9ae187ca3d25b8305754 SHA-1: ec3ef4d5e8af518e26cc2aba18baad764e0eced8 SHA-256: 072e8b107c13b7904d8b156882db99d30b6b486b9472d7d7ccea78e4554849e2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The presence of a GetObject call further suggests dynamic execution. The VBA code appears to be obfuscated, but its intent is likely to download and execute a second-stage payload. The Decode64 function is present, indicating potential Base64 encoded commands or data.

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
3af6559aaba71daf5fb0459c3fb4f462d5c6b7a2142cde3d86d1cf5474bde913		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
5941df5dce29b552e38e052cdcadecb9697a3ed3ca7e2566d7087205a14cfea2		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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