IcedID — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 1510e8ee68ab3a24…

MALICIOUS

Office (OOXML) / .XLSM

172.8 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 910a164605f2dfc06117a9d013913c81 SHA-1: f298cb07bb10f5fb282aaf8af1d9b8b06f462933 SHA-256: 1510e8ee68ab3a2435d8b30f2749e4e7217c466599dd982591a91142f90c6870
270 Risk Score

Malware Insights

IcedID · confidence 95%

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

This XLSM file contains Excel 4.0 macros that leverage dangerous functions like FORMULA and REGISTER to download a payload from the URL http://45.150.67.243/44285,5327891204.dat. The Auto_Open VBA macro also calls a function on the 'Brisk' sheet, indicating a multi-stage execution. The ClamAV detection and heuristic firings strongly suggest the IcedID family, known for its downloader capabilities.

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.
  • Dangerous XLM formula APIs: FORMULA, REGISTER, EXEC, GOTO, 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 a VBA project — 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 3 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://45.150.67.243/44285,5327891204.dat
    • http://195.123.210.186/44285,5327891204.dat
    • http://91.211.89.28/44285,5327891204.dat
    • http://45.150.67.243/
    • http://195.123.210.186/
    • http://91.211.89.28/
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2f26ac96bba202e05dcf847261e1d1663d430574538bb7b407a117ed8f397467		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 727 bytes
vbaProject_00.bin
25ca724fd75501ff785a097b45b6826bb69f8f90f8407e73a57e3b764293091d		 vba-project OOXML VBA project: xl/vbaProject.bin 10240 bytes
xlm_sheet_00.xml
ee5687b236838b0c2b9f778810736f77da82d41adf1f4bda0ecde74b95813e64		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 3810 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
xlm_sheet_01.xml
de9a94a6a839b1468572aebbbe877009c458e067a032a9d5fb0d49f065cce601		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 1511 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
xlm_sheet_02.xml
7bc55721481c93f5e2dea31cdb217e35fe6802807e720b778603a24c7aa4ca5a		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet3.xml 1506 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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