Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ece35d3431df33db…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 03243456c634a65b23420c1caed9b57f SHA-1: 24da2e9f4c44218c09931228b1d8c13be01d05d9 SHA-256: ece35d3431df33db60e7358058f6cf5163d94decbae0eea5ef30664555912f4e
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 likely decodes and executes a payload from obfuscated data, potentially downloaded from a remote source.

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
654d368d43452a6bbc92ecb6c4d99fcf23881ae1001846e8221a869a704f3866		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
5419459a9899e34bf7ffc7c37b46e217c5a2099b696de629b3c363eaa77d8940		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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