Office (OOXML) malware analysis — malicious · d6362241f1785b23

MALICIOUS

Office (OOXML)

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

MD5: c05a8b6493c74903a07fd35a4524cf51 SHA-1: 22c908934e93eac34068ded7e8aa2367885104d5 SHA-256: d6362241f1785b23284f59e0d811ba6964100ac3effdda80822c75dbbad67c3c

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1087.002 Local Account

The sample contains a Workbook_Open VBA macro that references cmd.exe and powershell.exe. The macro utilizes GetObject and WMI to launch a process, indicating it's designed to download and execute a second-stage payload. The VBA code itself appears to be obfuscated, making it difficult to determine the exact payload or destination.

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` `2b0853427642bf7170040a94cbf1542db2a727f0d88e8583e7fd5d7ebf1a057a`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	36431 bytes
`vbaProject_00.bin` `a6e2bc5c67fd1607efcde4d553414fe4647359244b874f8c3db589254fc64f12`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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