Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2930e723e1a1741e…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 059852693ed953c90eb255a19a2ae461 SHA-1: 6b35daf69cd83e0388b537cf5e27b9888f327ff0 SHA-256: 2930e723e1a1741ed6b1aa80ea4e69ed1293ae72c428e0f9e6e44b99a202d020
160 Risk Score

Malware Insights

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

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject, suggesting it's designed to execute external commands. The VBA code itself appears to be a Base64 decoder, likely used to obfuscate a payload that is then executed via PowerShell or cmd.exe.

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
ac410c32206f90dca88b039ce6e5dc87dc91cd129bd8343d214371a5cc2614b3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
cfa5d6cbde7375c87c2e1fb1a098c800a333b49a7abfa13665caa97deae1591d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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