Office (OOXML) malware analysis — malicious · a88f969a1649de75

MALICIOUS

Office (OOXML)

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

MD5: 570dc11b2e8605d83a0faee6bd7c2b06 SHA-1: 6febf8311839b532acca36dd22c498898de4960e SHA-256: a88f969a1649de757cd24a422e41adada2beab2fd08db7cfc473ac7494807499

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 VBA macros that are designed to execute.

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` `cbe0d2590f3e367b85855d0393eeee97569326df05e1da9de84a582e6c8b5548`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35520 bytes
`vbaProject_00.bin` `dfc6520bdecfbca210065caf598283456676ec75aa387c29300735d1d7645a64`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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