Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 21374c9c4735fc77…

MALICIOUS

Office (OOXML)

411.0 KB Created: 2019-01-28 15:00:04 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-10-14
MD5: ced2cb3c434f74dd56a143b142ab0c03 SHA-1: 7ff332c6567144ca61b1968d174fdd5812903e4e SHA-256: 21374c9c4735fc775fb0292c1941cd29dc1a07ec5e0fbb07b49f2999d0a7e61c
108 Risk Score

Malware Insights

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

The file is an Excel document containing VBA macros, including an Auto_Open macro, which is a common technique for executing malicious code upon opening. The presence of an external relationship pointing to a local file path suggests an attempt to trick the user or exploit a specific file structure. The VBA macros likely serve to download and execute a secondary payload, although the specific script content is truncated.

Heuristics 4

  • External relationship high OOXML_EXTERNAL_REL
    External target in xl/externalLinks/_rels/externalLink2.xml.rels: file:///\\Duong\e\thang\Daiichi\Denso\Quang(fertilizer- Ca mau)\Civils\ammonia\6823 PS 1700.xls
  • VBA project inside OOXML medium 1 related finding OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Hidden worksheet (veryHidden, hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 2 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 12867 bytes
SHA-256: c60f7382e35d31cb56c596cb444a5fcf999f9cd05e0d1a7cf3d4741a952f63f5
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"

Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Trang_t¨ªnh2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Trang_t¨ªnh4"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet47"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Trang_t¨ªnh18"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet35"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Module2"
Sub KTHH_HG()
Attribute KTHH_HG.VB_ProcData.VB_Invoke_Func = " \n14"
    Range("S38:V52").Select
    Selection.Copy
    Range("M38").Select
    Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
        :=False, Transpose:=False
    Application.CutCopyMode = False
    Range("Q38").Select
    ActiveSheet.Range("$B$38:$D$54").AutoFilter Field:=1, Criteria1:="<>"
End Sub
Sub CD_DAY_HG()
Attribute CD_DAY_HG.VB_ProcData.VB_Invoke_Func = " \n14"
    Range("S41:U55").Select
    Selection.Copy
    Range("K41:M41").Select
    Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
        :=False, Transpose:=False
       Application.CutCopyMode = False
    Range("R42").Select
     ActiveSheet.Range("$Q$41:$Q$56").AutoFilter Field:=1, Criteria1:="ok"
End Sub
Sub KTHH_HM_C()
Attribute KTHH_HM_C.VB_ProcData.VB_Invoke_Func = " \n14"
    Range("R42").Select
    ActiveWindow.SmallScroll Down:=27
    Range("R42:U70").Select
    Selection.Copy
    ActiveWindow.SmallScroll Down:=-21
    Range("M42").Select
    Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
        :=False, Transpose:=False
    Application.CutCopyMode = False
    Range("Q43").Select
End Sub
Sub KTHH_HM_C_HIDE()
Attribute KTHH_HM_C_HIDE.VB_ProcData.VB_Invoke_Func = " \n14"
    Range("Q42").Select
    ActiveSheet.Range("$Q$41:$Q$70").AutoFilter Field:=1, Criteria1:="ok"
End Sub
Sub CD_BTL_C()
    Range("S41:u55").Select
    Selection.Copy
    Range("M41").Select
    Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
        :=False, Transpose:=False
    Application.CutCopyMode = False
    Range("Q41").Select
    ActiveSheet.Range("$q$41:$q$55").AutoFilter Field:=1, Criteria1:="ok"
End Sub


Attribute VB_Name = "Module4"
Sub LIST()
Attribute LIST.VB_ProcData.VB_Invoke_Func = 
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 61440 bytes
SHA-256: 199b5a100e86fdf6160fe58dc96891921b02c0e5fb71932964f58ab9349eafea

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