Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ee8471c687321d5c…

MALICIOUS

Office (OOXML)

42.0 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 8b8bc7d4a167b8e2ae570296af574e56 SHA-1: f33665aad3c093a5a5b5e738345be4c012620b70 SHA-256: ee8471c687321d5cbbb2135f83f641cce6982fa79829adfa486d0e71fc7cb305
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This Excel document contains a Workbook_Open VBA macro that references cmd.exe and PowerShell. The macro also uses WMI to launch a process, indicating an attempt to execute arbitrary commands. The presence of a Workbook_Open macro and the use of cmd.exe and PowerShell strongly suggest this file is a malicious macro-enabled document designed to download and execute a secondary payload.

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
cbc105c48a44d7f06d02b95b891f48985834764c05d08efbb04d761344b45ceb		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35694 bytes
vbaProject_00.bin
d82aba9b709471538db58192265973ef25b0d808c4c7b7e91b7bf643f7786961		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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