IcedID — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 49d5d44dfbf837f8…

MALICIOUS

Office (OOXML) / .XLSM

328.7 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: a213535fa13061b5948a1fedaf683e7b SHA-1: 8410b175a723fe1258a72de7c554bfa7c6a1aae9 SHA-256: 49d5d44dfbf837f89cda649bb1622b1ed9fcc07e1be6411982ecf81ce7d7cbd7
268 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1105 Ingress Tool Transfer

This XLSM file contains Excel 4.0 macros that utilize dangerous functions like FORMULA and REGISTER to download and execute a payload. The presence of an Auto_Open macro and the detection by ClamAV as 'Xls.Downloader.IcedID' strongly indicate its malicious nature. The embedded URLs are likely sources for the second-stage payload.

Heuristics 8

  • Excel 4.0 macro sheet (4 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.
  • Dangerous XLM formula APIs: FORMULA, REGISTER, GOTO, EXEC, 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.
  • ClamAV: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.IcedID-9f1f1d193a2a2a2b-9951463-0
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • 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 4 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://188.127.235.67/44300,5396033565.dat
    • http://185.250.149.128/44300,5396033565.dat
    • http://190.14.37.190/44300,5396033565.dat
    • http://188.127.235.67/
    • http://185.250.149.128/
    • http://190.14.37.190/
    • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
5e1e6cacd5c19944d159bc2c10aa7a7083efce93b6f69d8715f37839b3ed0438		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 765 bytes
vbaProject_00.bin
4adb1a6435062aa43bd0ba8ff8e08fb04223bd57373680be573532cb74427d93		 vba-project OOXML VBA project: xl/vbaProject.bin 10240 bytes
xlm_sheet_00.xml
37472e2748134107af7c9e5878f55d34c882933b8fb73891d7e4888179caca2a		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 4191 bytes
xlm_sheet_01.xml
39798259f03cd9672f45bba1a0c51b94f7031e1df15836708059f64e9c8de85c		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 1898 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
xlm_sheet_02.xml
087b59902138090c81230ad630d9538d2340e8fcac4fca76f849f82cb60088a2		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet3.xml 1869 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
xlm_sheet_03.xml
145b3c5862c9bdc90f5655a09e2ac31ff5670b02c5e78c573e1be59397d1de5d		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet4.xml 1916 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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