Office (OOXML) malware analysis — malicious · ac3bb7ea495d0f60

MALICIOUS

Office (OOXML)

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

MD5: 1021c2fdbaf3c645d4e5b8118f928e1b SHA-1: 8553e12a3578118122c2d93c816e0a0d3a395bd4 SHA-256: ac3bb7ea495d0f600b9248b17a293f418f67c7ff0435ce029272b59bfe91fabf

260 Risk Score

Malware Insights

MITRE ATT&CK

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

This Excel document contains a Workbook_Open macro that references PowerShell and cmd.exe. The macro also utilizes WMI to create a new process, indicating an attempt to download and execute a secondary payload. The presence of a Workbook_Open macro and the use of PowerShell and WMI are strong indicators of malicious intent.

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` `e12bfafc57d86a069350de06b4abb2b761630ac88e04ae347ee642fad2c1cc24`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	36636 bytes
`vbaProject_00.bin` `dff3ff258e1fc7d62046e752c2fde5e286f4803eb04c371b19910fa11a0b5f34`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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