Office (OOXML) malware analysis — malicious · b8300fe10d4d1a59

MALICIOUS

Office (OOXML)

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

MD5: dc0d58a6974c3130a2252fd7e04dd6f6 SHA-1: 613f3e40f6ada3d76c22f4f51fc0bc5295fda0db SHA-256: b8300fe10d4d1a59835af6cd20ef221af1c596e639c4149cc30954d7b9969260

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an Office document containing VBA macros. The Workbook_Open macro triggers the execution of a PowerShell command using WMI's Win32_Process.Create method. This is a common technique for downloading and executing additional malicious content. The VBA code also contains a Base64 decoding function, suggesting obfuscation of the payload.

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` `1dddf5f16869a1eee531f5d85cda608c3e77bb9536ca07f1ce81ff24b6cdc2e3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	36341 bytes
`vbaProject_00.bin` `bd5bcd6fd49e48ce16f62a8563067b2e2d250970810dfa84e153eb3cc2e45c7c`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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