Office (OOXML) malware analysis — malicious · c14bd48d6ead5c73

MALICIOUS

Office (OOXML)

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

MD5: 8c71fc9517556b98fd4109348cc88442 SHA-1: 55430a96727c59f6a830ca0ef56727ccf4b0ac9d SHA-256: c14bd48d6ead5c73a976d765f4d4d5e46e0d7c2bfbceb2237cc2405b9d2b5732

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file contains a Workbook_Open macro that references PowerShell and cmd.exe. The critical heuristic 'OLE_VBA_WMI_PROCESS_CREATE' indicates that the VBA code uses WMI to launch a process. This suggests the macro is designed to execute a command, likely to download and execute a second-stage payload. The base64 decoding function is present but truncated, preventing a full analysis of its purpose.

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` `20a20b2718923fdbafcd6e4cbc88afdfb6b810889148253ab381baad297e9d46`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	36376 bytes
`vbaProject_00.bin` `1e8d5dce5abf279d280465c5984259877deec1e5acd5318683938260dc815d3b`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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