Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 732baa438a3750fd…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d37064d21588b34837f2f74ba26e5d8d SHA-1: 7c6e6c004012ee98237f418aac58e7cca251e6ac SHA-256: 732baa438a3750fda21743d31c0ba404b8bc0f29023d62dbf6942258ca1308f5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA code appears to be obfuscated and includes a Base64 decoding function, suggesting it's designed to download and execute a secondary payload. The specific obfuscation and lack of clear URLs make family attribution difficult.

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
b98a79be0b2482f8f65dcb201f0a6c9bbea39c7764332bcc87ed02ddfb08bbe3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
691f7dc5a888d83587c219f883fe6c95004ca2942174bce580d1fa3e305455b8		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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