Office (OOXML) malware analysis — malicious · b3b92e7e5dbac046

MALICIOUS

Office (OOXML)

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

MD5: 237fb05fc2d722ef96aeb6c5d2b3c2be SHA-1: 6cf78b962edef81a930d9ad1d981909d3fefa12a SHA-256: b3b92e7e5dbac046cc3048cfe7bc63686df42ac799bb62cadbdaa85aa510463f

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This Excel document contains a Workbook_Open macro that references PowerShell and cmd.exe. The critical heuristic 'OLE_VBA_WMI_PROCESS_CREATE' indicates the macro uses WMI to launch a process, likely to download and execute a second-stage payload. The macro also contains Base64 decoding logic, suggesting obfuscation of the malicious 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` `74cddbf620252d6bf4084050e81d65d86ebfab0ec5a764c1462aa92fc241ae5f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35194 bytes
`vbaProject_00.bin` `b51450f2cffd47f3903ec067894df7692533602481f156fdd7b6d97e7a573fcd`	vba-project	OOXML VBA project: xl/vbaProject.bin	11264 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.