Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 47ffe62a7c62513e…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: e3700b2d3dcafd17e36759b43a2a64d8 SHA-1: 24ed1941f4f4e33bb131c86d88c93f041bcadec5 SHA-256: 47ffe62a7c62513e4b6b5e21fbd02e032014a60c760736fe78bf59b5664d08f4
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to decode and execute a payload. This is further supported by the critical heuristic firing for a PowerShell reference in VBA. The likely intent is to download and execute 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
f782f68472e9b855d6aae86f128831274227799076f92daae316588286d885b3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
63286ffac50fef2136a4f89444eaee2466e1c826ff62f435ee534e82ccfd59d7		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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