Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 aac103ba671dcc44…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 17b268ab0c3d45a36de99a55c1de3e7e SHA-1: 133a864b8f12805b9ea8eecf226772a9748587b6 SHA-256: aac103ba671dcc4496c4c61b876212126175e7825fd9f14e3d2beb890b7f27ae
160 Risk Score

Malware Insights

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

The sample is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses the GetObject function. The VBA code itself appears to be heavily obfuscated, but the presence of these indicators suggests it is designed to download and execute a secondary payload. The specific family is not identifiable from the provided evidence.

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
174297b1ddbbd1815ebd81c4a88bd8bf50af80b943000ba0ce65dc024a4f33d5		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
7f471489b6783329ef92b3bf02c69d4b9b974634a9e3649de325fcdada3f32d7		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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