Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c6b678c65537a266…

MALICIOUS

Office (OOXML)

42.1 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d9d09655a6677d994f924ab8e5b566f0 SHA-1: 21c57e400ba1fc1cc33e9bd56f4d34b10492b191 SHA-256: c6b678c65537a2667f5aba754b04a2bd452daddac31913325b875046b88ea0bc
260 Risk Score

Malware Insights

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

This OOXML document contains a Workbook_Open VBA macro that references cmd.exe and PowerShell. The critical heuristic 'VBA WMI Win32_Process launcher' indicates that the macro attempts to launch processes via WMI. This suggests the macro's primary function is to download and execute a secondary payload, likely using PowerShell.

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
4aae1f12c8660ba244e1d71e34665883c994b5343074174234fc6866466dbb8e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 36382 bytes
vbaProject_00.bin
f9b2b6556283ae4030cb8a1ae1ecdffd7ee8f6914e23278be958a3e492f25a0a		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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