Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 0e8b2344aa1196c5…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0eae61d81fcff702d3834a01ff38dee7 SHA-1: 4454a9bb25c8ea4b61da9e217df5894a6d86ba6c SHA-256: 0e8b2344aa1196c5873d76654de49523202e1d6748027b4a03accf39b6de2bcd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

The sample is an OOXML file containing VBA macros. Heuristics indicate the presence of a PowerShell reference within the VBA code, along with calls to GetObject and cmd.exe. The VBA code itself appears to be obfuscated and includes a Base64 decoding function, suggesting it is preparing to execute a payload. The primary intent seems to be the execution of a PowerShell command, likely to download and run a second-stage 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
869bb804fa907be105136fc7a579b912899e6fd35982def3a98ec7b35f366e96		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
cbeed9579ffe960760e845b0fc66a3248bdce7451b61afafe505dd306eec6a56		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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