Office (OOXML) malware analysis — malicious · 356f172362ebb07a

MALICIOUS

Office (OOXML)

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

MD5: b4b32e0e48707ad9e1310c3d838f7620 SHA-1: 7b3b694c590e34df5034d60a829cc257e4a25781 SHA-256: 356f172362ebb07aee8d09da06a602238505a64217d8f48da40330e1e0b6f770

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1218.005 System Binary Proxy Execution: Mshta T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The sample contains a Workbook_Open macro, a common technique for initial execution in malicious Office documents. This macro references cmd.exe and PowerShell, indicating it's designed to download and execute a second-stage payload. The use of WMI to launch processes further supports this malicious intent.

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` `a3418f121cae1c69f647a157e316951cb5f10f80cd9e54eb11f4d0d07b7ffc7a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	36404 bytes
`vbaProject_00.bin` `9d1da29b64fedae9332a7363e79add58dd3e553238e7c852463c5c625f57742a`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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