Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a1cc22927ac50b76…

MALICIOUS

Office (OOXML)

42.2 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: dea251a3874d883fa86e83f36625d097 SHA-1: 529a8b994f6d689b0aef4235dcc0387f812f594c SHA-256: a1cc22927ac50b762b29813fe2dd1192805ffb3f0c18d8fa7b36e595f1a84f79
260 Risk Score

Malware Insights

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

This Excel document contains a Workbook_Open macro that references PowerShell and cmd.exe. The macro also utilizes WMI to launch a process, indicating an attempt to execute a secondary payload. The presence of a Base64 decoding function suggests obfuscation of malicious commands or URLs.

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
57056384dc187bf6e3961c95c45a083ee7faf7927c14d93e192d000c0e8e305e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35651 bytes
vbaProject_00.bin
e33f036174eff329dcfcf16b1f5d1a3df8d42f9d3784bb84f3078e3da29e79f1		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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