Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 92acaa699f20c751…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 31d43fb5f8bda36c1b48303849d7899a SHA-1: 8c3305e656826cf82f09af4baeb85d4623d943c8 SHA-256: 92acaa699f20c7516c2d7436a1588ac9658fa53a5ce9a66b84836dd6bf80ba2c
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 download and execute a second-stage payload. The specific obfuscation and lack of clear URLs prevent a more precise family attribution.

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
c13c7c591f6f5ef7aaf2b52c5318ae2431cf36eff0df7c61c63e3caa3fab609c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
60da0f5bbb47374d64a52aeee85db8651d5b5c2841e0cd5b1ffd17dc14a7608a		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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