Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b99a620406edb7b6…

MALICIOUS

Office (OOXML)

42.0 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7d89a8620ad9449794edd893694b2b74 SHA-1: e9692e971bfdf94b3f191553197ba131c6c88123 SHA-256: b99a620406edb7b6bea3fcd52a23a33f6f1511b11ba450206e645cb321015973
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1547.001 Registry Run Keys / Startup Folder T1204.002 Malicious File

The file contains a Workbook_Open macro, which is a common technique for executing malicious code upon opening an Office document. This macro references PowerShell and cmd.exe, and uses WMI to launch a process, indicating an attempt to download and execute a secondary payload. The presence of a Workbook_Open macro and the use of PowerShell strongly suggest a downloader or dropper functionality.

Heuristics 6

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
e6270263bba887f98aead4183fdce141c63e3fc09ea5ce2500e96f9a710e9622		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35803 bytes
vbaProject_00.bin
5c59c46066f8885ec4c09539874e372a566fad9c2d53943f595c8a99468dac92		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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