Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 bb4212bf43111c29…

MALICIOUS

Office (OOXML)

417.8 KB Created: 2019-01-28 15:00:04 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-10-16
MD5: 02b63eb7fb27a1106e0b3d5b9a02cc86 SHA-1: 7637cbded736d077a388e3e22eff5576d980474c SHA-256: bb4212bf43111c29fc4cb4591ed8ead2dd954208d3957364af534918a993d3b2
108 Risk Score

Malware Insights

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

The sample is an Excel document containing a VBA macro, specifically 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 access or leverage local resources, potentially as part of a payload delivery chain. The macro's intent is likely to download and execute a secondary payload, although the specific mechanism is not fully detailed in the provided script excerpt.

Heuristics 4

  • External relationship high OOXML_EXTERNAL_REL
    External target in xl/externalLinks/_rels/externalLink1.xml.rels: file:///\\KS_KIM\대전 EXPO\hb\삼산1지구(실시)\주공수량\일위대가9803.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) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 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) 14111 bytes
SHA-256: c4c4185746e6e907ed348e433f10f757f800094e8b477e568d3bffee1c3317d8
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 = "Module6"

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 = " \n14"
'
' LIST Macro
'

'
    Range("J8:J9").Select
    Selection.Copy
    Range("I8").Select
    Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
        :=False, Transpose:=False
    Application.CutCopyMode = False
    Range(
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 67584 bytes
SHA-256: 11689070f5870b89cf774a9fba956fcbd259ca5e11f0b313d14427621ff2f9b5

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