Emotet Office (OOXML) / .XLSM malware analysis — malicious · da53684d9244fbf7

MALICIOUS

Office (OOXML) / .XLSM

119.8 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-02-28

MD5: b97a4666359dd9c32a805642c0e48d08 SHA-1: 8c5a399549085f371ffa2d78d9730e5c3957dfd7 SHA-256: da53684d9244fbf76d3f2a281e0315e2d3d0b596f70150ca23ad0b2e236545c4

310 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1218.010 System Binary Proxy Execution: Regsvr32 T1059.005 Command and Scripting Interpreter: Visual Basic T1105 Ingress Tool Transfer

This XLSM file contains Excel 4.0 macros that leverage dangerous functions like FORMULA to download payloads from multiple URLs. The macros are designed to execute these downloaded payloads using regsvr32.exe, a technique commonly associated with the Emotet family. The specific URLs and the use of regsvr32.exe for execution are strong indicators of this malware family.

Heuristics 8

Excel 4.0 macro sheet (3 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.
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 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.
ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
External relationship medium OOXML_EXTERNAL_REL

External target in xl/externalLinks/_rels/externalLink1.xml.rels: /Users/Admin/Desktop/File/25f/CIR-ZV/ZV/1.xlsm
Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET

Excel workbook contains 5 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 https://medtunisie.com/sabsk/RPHiQ838FomJHhLbx/
- https://rackup.io/fm21-240hz/EuPjKEV/
- https://yatrataxi.com/folwu/yeZpDCIs2vjb3/
- https://nextdayfoundationllc.com/wp-content/MRoFCBhjinZz0xW/
- https://gavalisamajsevasangh.com/abcd-trey/SNWCwqavBe3xjSi7/
- https://thelastpeopleonearth-dayz.com/wp-content/Ehy/
- https://medtunisie.com/sabsk/RPH
- http://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.microsoft.com/office/excel/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/spreadsheetml/2016/revision6

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.xml` `89c26479f37f3bcfaa788cf2d6bf414b8d117d2215b65d83763a5e1da0da7c6d`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml	4012 bytes
`xlm_sheet_01.xml` `b56513fbb1f2288813fa2a6da2d3cfcd001c3a4a4603f7356a7d74f63b368b8a`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.xml	1278 bytes
`xlm_sheet_02.xml` `9d32fd8fe9c8793e70a9d2b735d711b2c4543a299d1129e4c1b47cf7f0c0d28e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet2.xml	1152 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.