Office (OOXML) malware analysis — malicious · a9c8f6cac33795ea

MALICIOUS

Office (OOXML)

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

MD5: 8a759e663ec8aeeda4a78bb6ef157fcb SHA-1: 3d2841c2b2168e6ac9751c8f52bdcec4ead140e3 SHA-256: a9c8f6cac33795ea4933008738708b9708cba2ecab551347fc3815902a8b2abc

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The OOXML document contains a Workbook_Open VBA macro that references cmd.exe and PowerShell. The macro utilizes GetObject and WMI to launch a process, indicating an attempt to execute arbitrary commands. This suggests the file is designed to download and execute a secondary payload, characteristic of a macro-based downloader.

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` `5652b64796dee00689735e66ae5714be0102476cd096d0a0cd3ac5ad887004d2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35510 bytes
`vbaProject_00.bin` `21dbcfeaa82672162c72cf6d922300b50a5741c18eedbf1da2333e779f059ebe`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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