Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 645b5da5594d27fe…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: bb86231ddd74c6eb1cc2bd1b4a4b6139 SHA-1: cbd334895e7b212bb833b7dee4a4db220e3e904c SHA-256: 645b5da5594d27fe15f3703c272a713ee4b46105a34a7d84547ed8bd5ab7c523
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML document 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.

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
5384efacd435ab651875b1692c378832d168718cc51794998992209435b85002		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
457ee6c2356b5c3f5c7840154956277df16a706549d93e290314406e19883cb5		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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