Office (OOXML) malware analysis — malicious · d6b5df993ebf471a

MALICIOUS

Office (OOXML)

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

MD5: 95f17adea831301f52f668b74a244240 SHA-1: f0db7ebd6e2b76d6b77da7be2b505952e023c31b SHA-256: d6b5df993ebf471a379235b4e96650a9884f43a3c4291d91f0bfbbe1c10437e3

260 Risk Score

Malware Insights

MITRE ATT&CK

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

This Excel document contains a Workbook_Open VBA macro that references PowerShell and cmd.exe. The macro also uses WMI to launch a process, indicating it's designed to execute arbitrary commands. The presence of a Base64 decoding function suggests obfuscated code is being used to hide the actual payload, likely a downloader.

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` `d4d7c9521f97b66277591f570904757e9c2f5228802aadbffc61eebc0a46dd40`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35749 bytes
`vbaProject_00.bin` `9c2d21f044fbe23e9a8123af18faca95fb5de524c4ce8f81f4a1aea312bf42cf`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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