Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d93bdce1d10ba6ec…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0f968eb722fdfc967259014476f51515 SHA-1: 16a5e034fef6af3163de93269c6b158e61798155 SHA-256: d93bdce1d10ba6ec84a22986f2cb6efc7efe15dc737691fe94d56d11135c11d6
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 GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating that it is likely used to obfuscate and decode a payload which is then executed via cmd.exe or PowerShell.

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
a07abd971c2a7e152eb5b452ab49d70b62a669acca8029cb81e11e7f9b46df1d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
ff0a4c999767d13711ccb29c1efae3c7a46b852a1897cc35208d5c0d66e0fe5d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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