Office (OOXML) malware analysis — malicious · d02fd9a9e9c95196

MALICIOUS

Office (OOXML)

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

MD5: 5e17183162d5d3dd3b5d00ca6e68406f SHA-1: 18f91c1028432c8b43a2d861706f900ff5e946b6 SHA-256: d02fd9a9e9c9519635d95daf244a48ff9600ef8d8158c3494c1698196259e107

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

The file contains a Workbook_Open macro that references PowerShell and cmd.exe. The critical heuristic 'OLE_VBA_WMI_PROCESS_CREATE' indicates the macro uses WMI to launch processes, likely to download and execute a second-stage payload. The presence of a Base64 decoding function suggests obfuscation of malicious commands or URLs.

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` `9c2130b56365b104ca12dd60c53ddb787fdaf9a5c0316a0e7caad4c3996191f1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	36734 bytes
`vbaProject_00.bin` `db282b0f9e745b64ea112389ffcaaa952c5cfb46cde75bba22851887f8046797`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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