IcedID — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 794f84e7548986b4…

MALICIOUS

Office (OOXML) / .XLSM

328.7 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 6032b219b2f6bec4f709685d527d7aae SHA-1: ca97a682f361ea19b15aa502c3e80a9825c91ca8 SHA-256: 794f84e7548986b4cfe12429b135983e1d1228e3d62a0d4c017120ab674c362d
270 Risk Score

Malware Insights

IcedID · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1566.001 Spearphishing Attachment

This Excel macro-enabled document (XLSM) contains critical Excel 4.0 macros that utilize dangerous APIs like FORMULA and REGISTER. These macros are designed to download and execute a second-stage payload from one of the provided URLs, such as http://83.136.233.146/44300,5396033565.dat. The presence of an Auto_Open macro and the ClamAV detection further support its malicious nature and likely association with the IcedID family.

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 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 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://83.136.233.146/
    • http://45.12.32.87/
    • http://185.82.218.2/
    • http://83.136.233.146/44300,5396033565.dat
    • http://45.12.32.87/44300,5396033565.dat
    • http://185.82.218.2/44300,5396033565.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 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
254c35b4d34a930ba29e0453964f9568479ee90909bf39f26fd59e91651bca96		 vba-project OOXML VBA project: xl/vbaProject.bin 10240 bytes
xlm_sheet_00.xml
ba27d07e1d0bd6c8736a205c756b71644c1edcdb0eff9c024feaea206045f0ee		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 4065 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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