IcedID — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 85d5f687f9e9a73b…

MALICIOUS

Office (OOXML) / .XLSM

325.4 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: a73d5e422e0721b7629ff9b960ce668b SHA-1: 55042d4e96dd4b811551c382ebbb4a29c6634ede SHA-256: 85d5f687f9e9a73b7126096b7c2455e43689c811c9110d2418b76941158860d1
270 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The file contains critical Excel 4.0 macros, including dangerous functions like EXEC and REGISTER, which are used to download and execute payloads. The embedded URLs and the ClamAV detection as 'Xls.Downloader.IcedID' strongly indicate that this file is a downloader for the IcedID banking trojan. The macros likely construct and execute commands to fetch the secondary payload from one of the provided URLs.

Heuristics 7

  • 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.
  • 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, 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
  • 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://45.67.230.109/
    • http://185.212.129.178/
    • http://45.90.59.72/
    • http://45.67.230.109/44300,5396033565.dat
    • http://185.212.129.178/44300,5396033565.dat
    • http://45.90.59.72/44300,5396033565.dat
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
ab7594a09a662f39c57268a5b7bf670113a98d618fbc91886d3f889e06e535bd		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 4091 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
e9ede02a3b195b353ba578d091c9e9fdf44e02d22a62334c471770c4e6d3eebe		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet3.xml 1880 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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