Office (OOXML) malware analysis — malicious · b140b50591ac6a17

MALICIOUS

Office (OOXML)

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

MD5: d0756f433b5d770393fab9aa0bb53e91 SHA-1: 4368d25ced51e9780539ba9ae91562810f7cd87d SHA-256: b140b50591ac6a178e935ee34d4c0fc31043d3be09e1f250cffa39396f338975

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1087.002 Local Account T1059.003 Windows Command Shell

The file contains a Workbook_Open macro, a common technique for executing malicious code upon opening an Office document. This macro references PowerShell and cmd.exe, and uses WMI (Win32_Process) to launch processes. The VBA code itself appears to be heavily obfuscated, suggesting an attempt to hide its true functionality, which is likely to download and execute a secondary payload. The presence of these elements strongly indicates a malicious intent to compromise the user's system.

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` `fe9b77d9b3507b4af28e5d4dd14fb80447c23022f348024ffe55cff5da03576d`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35503 bytes
`vbaProject_00.bin` `03b65bd954cf9ecaaaa39c4fa77f86e130dbcb32f8a6711d859fd8ae29f8b2c0`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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