MALICIOUS
310
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Service Execution: Visual Basic
T1204.002 Malicious File: User Execution: Malicious File
T1105 Ingress Tool Transfer
The sample is an XLSM file containing multiple Excel 4.0 macro sheets. Critical heuristics indicate the use of dangerous XLM functions like FORMULA, GOTO, REGISTER, and HALT, along with WinAPI strings such as URLDownloadToFileA and DownloadToFileA. This strongly suggests the macro is designed to download and execute a secondary payload, consistent with the IcedID family.
Heuristics 7
-
Excel 4.0 macro sheet (10 sheet(s)) critical OOXML_XLM_MACROSHEETSpreadsheet 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_DEFINEDNAMEWorkbook 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, GOTO, REGISTER, HALT critical OOXML_XLM_DANGEROUS_FNExcel 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.
-
Binary XLM macro sheet with WinAPI/download strings critical OOXML_XLM_BINARY_WINAPI_STRINGSExcel 4.0 macro sheet is stored as BIFF12/XLSB binary data and contains Win32 download or process-execution API strings such as URLDownloadToFileA, ShellExecuteA, or CreateDirectoryA. These strings are high-signal in XLM macro sheets and catch payload-download macros that XML-formula scanners cannot parse.
-
ClamAV: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0
-
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEETExcel workbook contains 10 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
-
Embedded URL info EMBEDDED_URLOne or more URLs were extracted from the document. The URL itself is not a detection — context-specific rules above attribute URLs they actually evaluated; this rule lists URLs that were present in the bytes but were not otherwise tied to a specific finding.URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
- http://schemas.microsoft.com/office/spreadsheetml/2014/revision
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3
- http://schemas.microsoft.com/office/excel/2006/main
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision6
Extracted artifacts 10
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.xml09932899a4e524f17b945b128a045eb99d63253dc73e41a4276cb441c47423b0 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml | 3050 bytes |
xlm_sheet_01.xml9579d89e84da3ea40da488d8619e2cf30e25c98d1eba11699bd4c72e8c5fe239 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml | 1497 bytes |
xlm_sheet_02.xmlad3f3284bce1dc17a3f12a6258b2eaa66d6ef86d5a438e09de5ecced3370d3b6 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml | 2240 bytes |
xlm_sheet_03.xmla97dde770fa8bc29cb0ec0a93a2ae316904685d2512ba1220cfee45f98648688 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet4.xml | 1551 bytes |
xlm_sheet_04.xml68030b89e6b4fa9175100e8b7d910608eca541d5ed4e2c0d66aeda37c494a807 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet5.xml | 1551 bytes |
xlm_sheet_05.xml4ebc5cb27ec4f2b547e1bd53bb611ec7d1683658b8c563ab084965c604bd18ef |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet6.xml | 1550 bytes |
xlm_sheet_06.xml02c5359e6c25391c9e987c378ea1fa498b510bbd77700855700c1f66d26cff91 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet7.xml | 1551 bytes |
xlm_sheet_07.xml0a36b8963427a06b07b518fde39e338399acae8b0375228e5cec6bdc4a42f657 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet8.xml | 1553 bytes |
xlm_sheet_08.xml98386f020be407140630c7a14a4e79f58808acc942ac53553e969d84e0686ded |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet9.xml | 1551 bytes |
xlm_sheet_09.xmlb6684636c4f1f8407672ee79c627800fb33d979b4b3c225b33925d6a1f612183 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/sheet1.xml | 1693 bytes |
Open this report in the interactive analyzer, or submit your own file for analysis.