Office (OOXML) malware analysis — malicious · cc330cbd6572a7bf

MALICIOUS

Office (OOXML)

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

MD5: 958448a599c5b37436065ad87a144a6e SHA-1: c330ed741640f419b16c9d2533d40ddbb6eb322b SHA-256: cc330cbd6572a7bfe6fa48a289dfb54f83ad9078b89723ef54e86947c847939b

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML document contains a Workbook_Open macro that references PowerShell and cmd.exe. The critical heuristic OLE_VBA_WMI_PROCESS_CREATE indicates that the macro uses WMI to launch a process, likely to download and execute a second-stage payload. The presence of a Workbook_Open macro suggests this file was likely delivered as a spearphishing attachment.

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` `77950b3b074e91e91afe68ab8d8f40c5b1af5582a793b15177ea5010af006165`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	36637 bytes
`vbaProject_00.bin` `cb8b6b4aaddbff4737d89097449c8948cbaee79417e84dcc25497baf84194cb4`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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