Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c15e66797b79698e…

MALICIOUS

Office (OOXML)

42.1 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 56aa89618dbbec0b57f12975301cc904 SHA-1: 7c6a134ae25413d5fa235363c24ab89ca4b24e12 SHA-256: c15e66797b79698e8e7f4960992d50419995e201f9898bac1bfc36fc8ee44767
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1106 Native API

This OOXML document contains a Workbook_Open macro that references PowerShell and cmd.exe. The macro also utilizes WMI to launch processes, a common technique for executing downloaded payloads. The presence of a Base64 decoding function suggests obfuscation of malicious code 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
b9765ca1d065e1c7d9761a4f0bb70202fbfce8b54742c896f5810454799e5070		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 36289 bytes
vbaProject_00.bin
83b96d712a64734b5b06cbb793439a802debcd98700179e71d8a3f5f1183d405		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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