Office (OOXML) malware analysis — malicious · d3638a2e2aba7c8b

MALICIOUS

Office (OOXML)

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

MD5: 4c9c6b45a019d1033f1d1adc31896267 SHA-1: 97e49df52810d60ebda7dece65fd9884eed97d65 SHA-256: d3638a2e2aba7c8bd92a36eca732bca3873d851f729c7011212cb2b4d728b27b

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell

The file is an Excel document containing a Workbook_Open macro. This macro references PowerShell and cmd.exe, and uses WMI (Win32_Process) to launch processes. The VBA code is heavily obfuscated, but the presence of these indicators strongly suggests it's designed to download and execute a secondary payload. The specific family is not identifiable from the provided evidence.

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` `e11f665fa41d7ec1cad849c782c77846e1293a19606a0770c4cb09b9a9574b28`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35215 bytes
`vbaProject_00.bin` `e9dd7747c12e1f567731244a389fe30e952cd85894e7b768adb5f4d089c1100e`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

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