Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a7adb2890cfb6c2c…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 513b666aadbfa383215fafa01b8dae2a SHA-1: 6215b88809a81ccf140ebefe6178a74e6d858fa4 SHA-256: a7adb2890cfb6c2cc2faccf7508810fecc8e3ba43426189f6ffe1fce57aa66f6
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to download and execute a secondary payload. The specific obfuscation and lack of clear URLs prevent further 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
5765e18347812dfb1a66c5a6cd20ea5d9acd8c12894405013eee13c89cb331eb		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
c3aab3ebc325af4e0dedf2ca56450372ce6f44b5d04c0723607f2db34a219527		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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