Office (OOXML) malware analysis — malicious · d660d9b69d566478

MALICIOUS

Office (OOXML)

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

MD5: aed5857b9dab4444ca2537ab252e1e5f SHA-1: 5659248d34da492e38ee635f38f05e03af90cee2 SHA-256: d660d9b69d56647872f2e129ba0b75267dad59c2befd74e582e4fcb158228f7a

260 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1106 Native API

This Excel document contains a Workbook_Open macro that references PowerShell and cmd.exe. The macro utilizes WMI to launch a process, indicating an attempt to execute a secondary payload. The presence of a Workbook_Open macro and the use of PowerShell and cmd.exe are strong indicators of a downloader or droppper malware.

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` `99ef211c7109989c39aaaf12ad907ce1a9fa278c3bbc044e1ba20587ad9f8204`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	35477 bytes
`vbaProject_00.bin` `daa213227574aa83e639c37910b67677958b0e2bca5d1041690ccfd439655319`	vba-project	OOXML VBA project: xl/vbaProject.bin	11776 bytes

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