Office (OOXML) malware analysis — malicious · ad441949eedcb20b

MALICIOUS

Office (OOXML)

41.9 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300

MD5: baf3b2ffcee8c2c156b354e113d06050 SHA-1: 3f7708de97523e3b8bd780967bfc9476289d6e15 SHA-256: ad441949eedcb20b235196323c9a019c4b5d86625c67c4040650e3fc5b1645b5

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1218.011 System Binary Proxy Execution: Rundll32

The file contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The presence of a Workbook_Open macro and the use of GetObject with WMI to create a process suggest an automated execution chain. The script also contains Base64 decoding logic, likely to obfuscate a payload or URL.

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.

Filename	Kind	Source	Size
`macros.bas` `4b718f964d0e2f82b1ff087be2841505b85413f0c2d886d6cfc61f8c12bf7f2d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35608 bytes
`vbaProject_00.bin` `aba489a56d060ccab3d1fcf196e741a962803aecfbb40dc839d0089cb9a8c4e1`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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