Office (OOXML) malware analysis — malicious · 23eb050ec65c628a

MALICIOUS

Office (OOXML)

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

MD5: 9805e44775f371c33c1155fcef0267bd SHA-1: b44c0f5a8ad7ec075c83702b3eff727bd701b72f SHA-256: 23eb050ec65c628a0a1999738869d0d90c5f24decd39f9d45b50ff992beb8b67

260 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is an OOXML document containing VBA macros, with a Workbook_Open macro that references cmd.exe and PowerShell. Critical heuristics indicate the VBA code uses WMI to launch processes, a common technique for executing downloaded payloads. The presence of a Base64 decoding function suggests obfuscation of malicious commands or URLs.

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` `78a375c4ca58ab5246333482db4195eed85af0d036519126c6bcdf8990245bfd`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35432 bytes
`vbaProject_00.bin` `4c05c392dd931e130ad9ca94a849bb966d3ef89edf52b78ba5af1d79038e4d20`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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