Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f047c4b74bd6d364…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: e1c276bccfafca8c4ec8addb242705ed SHA-1: 53495d54443697cc6e1b076d6bfd9c593e29dd0b SHA-256: f047c4b74bd6d3645a0c42b82b231545929e6be991fc2eaea9f567d9edc4104b
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The presence of a GetObject call further suggests the execution of external code. The VBA code includes a Base64 decoding function, indicating that it likely decodes and executes a payload. This points to a macro-based downloader attack pattern.

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
e45789aafd50b40a84a8f123a8f4b32eed27e8882872936fe257bf5b8bcc995f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
695744a7febd3927213cb15ffca37df310ddad3747ad3bab8dccc8e1f1c7b302		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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